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Multicentred randomised controlled trial of an augmented exercise referral scheme using web-based behavioural support in individuals with metabolic, musculoskeletal and mental health conditions: protocol for the e-coachER trial
  1. Wendy Ingram1,
  2. Douglas Webb1,
  3. Rod S Taylor2,
  4. Nana Anokye3,
  5. Lucy Yardley4,5,
  6. Kate Jolly6,
  7. Nanette Mutrie7,
  8. John L Campbell2,
  9. Sarah Gerard Dean2,
  10. Colin Greaves6,
  11. Mary Steele4,
  12. Jeffrey D Lambert2,
  13. Chloe McAdam7,
  14. Ben Jane8,
  15. Jennie King9,
  16. Ray B Jones1,
  17. Paul Little4,
  18. Anthony Woolf10,
  19. Jo Erwin10,
  20. Nigel Charles2,
  21. Rohini H Terry2,
  22. Adrian H Taylor1
    1. 1Faculty of Medicine and Dentistry, Peninsula Medical School, University of Plymouth, Plymouth, UK
    2. 2University of Exeter Medical School, Exeter, UK
    3. 3Department of Clinical Sciences, Brunel University, London, UK
    4. 4Faculty of Medicine, Southampton University, Southampton, UK
    5. 5Nuffield Department of Primary Care Health Sciences, Oxford University, Oxford, UK
    6. 6School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, UK
    7. 7Physical Activity for Health Research Centre, University of Edinburgh, Edinburgh, UK
    8. 8Faculty of Sport and Health, University of St Mark and St John, Plymouth, UK
    9. 9Patient & Public Involvement, Plymouth, UK
    10. 10Department of Rheumatology, Royal Cornwall Hospitals NHS Trust, Truro, UK
    1. Correspondence to Dr Wendy Ingram; wendy.ingram{at}plymouth.ac.uk

    Abstract

    Introduction Physical activity is recommended for improving health among people with common chronic conditions such as obesity, diabetes, hypertension, osteoarthritis and low mood. One approach to promote physical activity is via primary care exercise referral schemes (ERS). However, there is limited support for the effectiveness of ERS for increasing long-term physical activity and additional interventions are needed to help patients overcome barriers to ERS uptake and adherence.

    This study aims to determine whether augmenting usual ERS with web-based behavioural support, based on the LifeGuide platform, will increase long-term physical activity for patients with chronic physical and mental health conditions, and is cost-effective.

    Methods and analysis A multicentre parallel two-group randomised controlled trial with 1:1 individual allocation to usual ERS alone (control) or usual ERS plus web-based behavioural support (intervention) with parallel economic and mixed methods process evaluations. Participants are low active adults with obesity, diabetes, hypertension, osteoarthritis or a history of depression, referred to an ERS from primary care in the UK.

    The primary outcome measure is the number of minutes of moderate-to-vigorous physical activity (MVPA) in ≥10 min bouts measured by accelerometer over 1 week at 12 months.

    We plan to recruit 413 participants, with 88% power at a two-sided alpha of 5%, assuming 20% attrition, to demonstrate a between-group difference of 36–39 min of MVPA per week at 12 months. An improvement of this magnitude represents an important change in physical activity, particularly for inactive participants with chronic conditions.

    Ethics and dissemination Approved by North West Preston NHS Research Ethics Committee (15/NW/0347). Dissemination will include publication of findings for the stated outcomes, parallel process evaluation and economic evaluation in peer-reviewed journals.

    Results will be disseminated to ERS services, primary healthcare providers and trial participants.

    Trial registration number ISRCTN15644451; Pre-results.

    • primary care
    • hypertension
    • general diabetes
    • mental health
    • musculoskeletal disorders

    This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See: https://creativecommons.org/licenses/by/4.0/.

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    Strengths and limitations of this study

    • This is the first study to determine whether adding web-based interventions to primary care exercise referral schemes increases objectively assessed physical activity more than usual exercise referral schemes, after 1 year.

    • The study includes inactive adults with one or more common chronic conditions.

    • No physical health measures (except self-reported weight) were assessed in the study.

    • It is expected that participants will have multiple chronic conditions, meaning the study may not be able to determine intervention effects on physical activity for each condition.

    • Participants in the intervention arm will be invited to take part in in-depth qualitative interviews which may act as a cointervention.

    Introduction   

    Physical inactivity was found to cost the National Health Service (NHS) £455 million in 2013–2014 according to data collected by Clinical Commissioning Groups in the UK.1 Evidence-based guidelines recommend both aerobic and strength training for improving health markers and quality of life among those with common chronic metabolic conditions2–5 and musculoskeletal conditions,6 and mostly aerobic exercise for preventing and reducing depression.7 Public health guidelines of 150 min of moderate-to-vigorous physical activity (MVPA) per week are widely accepted but even small increases in physical activity and reduced sedentary time among the least active are likely to accrue health benefits.8 9

    Patients with obesity, hypertension, type 2 diabetes, osteoarthritis and depression are less physically active than the general population,2 and need greater support to overcome real and perceived barriers to increase physical activity. Increases in physical activity among the least active have the potential to provide the largest impact on health but any benefits dissipate without maintained levels of activity.10 A variety of initiatives have been explored to promote physical activity within primary care, including referring patients to ‘exercise on prescription’, that is, an exercise referral scheme (ERS). In the UK, ERS have been common for promoting physical activity, with an estimated 600 schemes involving up to 100 000 patients per year.11

    Evidence from a meta-analysis of eight randomised trials involving 5190 participants eligible for ERS12 indicated a small increase in the proportion of participants who achieved 90–150 min of physical activity of at least moderate intensity per week, compared with no exercise control at 6–12 months follow-up among at-risk individuals. But uncertainty remains regarding the effects for patients with specific medical conditions since no study assessed long-term physical activity objectively, and many of the eight studies reviewed had relatively small sample sizes.

    A systematic review13 reported an average ERS uptake (attendance at the first ERS session) that ranged from 66% in observational studies to 81% in randomised controlled trials, and average levels of adherence from 49% in observational studies to 43% in randomised controlled trials. Predictors of uptake and adherence have rarely been explored but it has been reported that while women were more likely to begin an ERS, they were less likely to adhere to it than men; also, older people were more likely to begin and adhere to an ERS.13 ERS may help patients become familiar with concepts such as exercise type, intensity, frequency and duration of exercise, matched to their medical condition, and target key processes of behaviour change. However, the following features of an ERS may reduce uptake and adherence: inconvenience, cost, limited sustainable physical activity support (eg, for 10 weeks) and low appeal for structured exercise and/or the medical model, that is, ‘exercise on prescription’, which may do little to provide autonomous support nor empower patients to develop self-determined behaviour to manage chronic medical conditions.11 14 It therefore appears that additional support may be needed which is accessible, low cost, can be tailored to support a wide range of individual needs and empowers patients to develop and use self-regulatory skills (eg, self-monitoring, goal setting) to self-manage their chronic conditions. A wide variety of online and mobile technologies have been developed and used to support changes in and maintenance of physical activity.

    There is considerable evidence on the effects of technology-based interventions for promotion of physical activity.15 16 These include studies with a wide range of interventions (from quite simple self-monitoring to interventions with complex multiple behaviour change components), targeted at different clinical groups with different baseline levels of physical activity, with various physical activity outcomes reported (very few using objective measures), and with mostly short-term follow-ups. Also, some comparisons are between intervention versus no intervention and others versus human contact, although none reports on the effects of adding web-based support to ERS. The impact for web-based and technology interventions on increasing physical activity is small to moderate (an effect size ≤0.4). However, there is evidence that more rigorous studies, interventions with more behaviour change components and ones targeted at less active populations are more effective.15 16 A systematic review17 has highlighted the importance of maximising sustained engagement in web-based interventions for enhancing change in the target behaviour. A recent study18 confirmed that self-monitoring of physical activity and tailored feedback were important to increase engagement, and periodic communications helped to maintain participant engagement.

    The LifeGuide platform (www.LifeGuideonline.org/) has been extensively used to develop and evaluate acceptability and impact of online behaviour change and self-management interventions with a variety of clinical groups, including in primary care.19–21 For example, adding online LifeGuide support to face-to-face support showed a greater lasting reduction in obesity than face-to-face dietetic advice alone.22 The LifeGuide platform provides a researcher-led tool to develop interventions drawn from theory and evidence of effective techniques23 24 and provides the opportunity to understand engagement and utility of different behaviour change components.

    Following iterative development work and user group testing and involvement, drawing on some online modules used in other LifeGuide interventions,19 we developed a bespoke intervention, called ‘e-coachER’ to support patients with chronic physical and mental health conditions who have been referred from primary care to an ERS to receive face-to-face support. Should the approach prove to be effective, there is considerable potential for the intervention to be scaled up for patients with obesity, hypertension, type 2 diabetes, osteoarthritis and risk of depression at probable low cost25 26 and also extend it for patients with other chronic medical conditions (eg, low back pain, heart disease, cancer).

    Aim and objectives

    The overarching aim is to determine if e-coachER online support combined with usual ERS provides an effective and cost-effective approach to supporting increases in physical activity in people referred to ERS with a range of chronic conditions.

    The specific objectives are as follows:

    • To determine whether in the intervention arm compared with the control arm, there is an increase in the total weekly minutes of MVPA at 12 months postrandomisation.

    • To determine whether in the intervention arm compared with the control arm there is an increase in the proportion of participants who:

      • take up the opportunity to attend an initial consultation with an exercise practitioner;

      • maintain objectively assessed physical activity from 4 to 12 months postrandomisation;

      • maintain self-reported physical activity from 4 to 12 months postrandomisation;

      • have improved health-related quality of life at 4 and 12 months postrandomisation.

    • To quantify the additional costs of delivering the intervention and determine the differences in health utilisation and costs between the intervention and control arms at 12 months postrandomisation.

    • To assess the cost-effectiveness of the intervention compared with control at 12 months postrandomisation (incremental cost per quality-adjusted life-year (QALY)) and over the lifetime perspective (incremental cost per QALY).

    • To quantitatively and qualitatively explore whether the impact of the intervention is moderated by medical condition, age, gender and socioeconomic status, IT literacy or ERS characteristics.

    • To quantitatively and qualitatively explore the mechanisms through which the intervention may impact on the outcomes, through rigorous mixed methods process evaluation and mediation analyses (if appropriate).

    Methods and analysis

    This protocol is reported in accordance with the Standard Protocol Items: Recommendations for Interventional Trials guidance27 (http://www.spirit-statement.org/spirit-statement/) for protocols of clinical trials and TIDieR guidelines28 (http://www.equator-network.org/reporting-guidelines/tidier/) for intervention description.

    Study design and setting

    This is a multicentre parallel two-group randomised controlled trial with participant allocation to usual ERS alone (control) or usual ERS plus web-based behavioural support (intervention) with parallel economic and mixed methods process evaluations. The trial design is summarised in figure 1.

    Figure 1

    Trial design/participant pathway.

    Recruitment to the trial will take place over a 21-month period (July 2015 to March 2017) in three areas in the UK, that is, Greater Glasgow, West Midlands and South West England (including Plymouth, Cornwall and Mid Devon). Only the latter includes some participants in more rural locations.

    Study population

    The study population will include patients registered with a general practitioner (GP) surgery and who have been or are about to be referred to a local ERS for a programme of support to increase physical activity. Participants will be aged 16–74 years and have one of more of the following: obesity (body mass index (BMI), 30–40), a diagnosis of hypertension, prediabetes, type 2 diabetes, lower limb osteoarthritis or having a history of treatment for depression. Participants must also be categorised as ‘inactive’ or ‘moderately inactive’ based on the GP Physical Activity Questionnaire,29 be contactable via email, and have some experience of using the internet. Patients are excluded if they meet any of the following criteria: have an unstable, severe and enduring mental health problem or are being treated for an alcohol or drug addiction that may limit their involvement with the study, do not meet the eligibility criteria for their local ERS or are unable to use written materials in English unless a designated family member or friend can act as translator.

    Study procedures

    Patient identification, approach and consent

    Patients will be identified as potentially eligible for the trial (i) by healthcare professionals in primary care at the point of being actively referred to an ERS or having been opportunistically found to be eligible for an ERS at a consultation with the primary care practitioner, (ii) via a search of patient databases at the participating GP practices (conducted by the local Primary Care Research Network team), (iii) via patient self-referral to the GP arising from community-based publicity for the trial, (iv) by the ERS programme administrator on receipt of an ERS referral form from a GP practice or (v) by exercise advisors at the ERS service at enrolment on the ERS (with the patient’s consent, the exercise advisor will provide the local researcher with the patient’s contact details for the purposes of the trial).

    Potentially eligible patients will be approached by the primary care practitioner or the local researcher, depending on how the patient was identified, or patients may self-refer to the local researcher in response to publicity campaigns. These various means of identification and approach are designed to accommodate the variation in usual care referral pathways to ERS across the participating sites and individual GP practices.

    Amenable patients will be offered a study-specific Participant Information Sheet, either by post, via email or by hand (the route used will largely depend on the preference of the participating GP practice or ERS service). Interested patients will be asked to communicate their expression of interest to the local researcher via a prepaid reply slip, by telephone or by email. On receipt of an expression of interest, the local researcher will contact the potential participant by telephone to discuss the trial, confirm eligibility and take informed consent.

    Baseline assessment

    Consented participants will attend a baseline assessment with the local researcher. This assessment will be conducted over the telephone, or in person at the GP practice or at the centre delivering the ERS or another convenient community location. Demographic data will be collected. The participant will be issued with a wrist-worn waterproof accelerometer (GENEActiv Original accelerometer http://www.geneactiv.org/) to wear constantly for one whole week (day and night), and a self-report questionnaire booklet to complete at the beginning of the week-long period. The accelerometer will be worn on the wrist of the non-dominant hand (ie, the hand not favoured for writing). After 1 week’s wear, participants will post the accelerometer and completed questionnaire to the Peninsula Clinical Trials Unit (CTU) in pre-addressed envelopes provided using a prepaid postal service. The measures collected at baseline and follow-up are shown in table 1.

    Table 1

    Schedule of baseline and follow-up measures

    Randomisation

    On receipt of the baseline accelerometer at the CTU after 1 week’s wear, participants will be randomised. Randomisation will be stratified by site with minimisation by the participant’s perceived reason for their referral to the ERS (ie, weight loss, diabetes control, reduce blood pressure, manage lower limb osteoarthritis symptoms, manage low mood/depression) and by self-reported IT literacy level on a visual analogue scale (ie, lower or higher confidence). To maintain allocation concealment, the minimisation procedure will retain a stochastic element and will be conducted using a secure, password protected web-based system.

    Blinding

    The ERS practitioners should be unaware of trial participants’ treatment allocations. Blinding of participants is not possible, given the nature of the intervention. Given that the primary outcome is an objective measure of physical activity recorded by accelerometer, and the secondary outcomes will be assessed by participant self-completion questionnaire, the risk of assessor bias is likely to be negligible in this study. However, to minimise any potential bias, the statistical analysis will be kept blinded and the code for group allocation not broken until the primary and secondary analyses have been completed.

    Follow-up

    At 4 weeks post-baseline, a short survey on initial uptake of the ERS will be administered via email.

    At 4 and 12 months post-randomisation, participants will be sent an accelerometer and questionnaire booklet by post, along with a simple instruction sheet on how to wear the accelerometer, and a prepaid envelope to return the items to the CTU.

    To maximise data completeness at follow-up assessments, participants will be sent standard letters/emails from the CTU: (i) 7 days before delivery of the accelerometer, (ii) 3 days into the 10-day recording window as a prompt for the participant to begin wearing the accelerometer (if not already doing so) and (iii) should the accelerometer not have been received at the CTU, at 3 and 5 weeks after issue as a reminder to post the accelerometer to the CTU. If the participant has not sent the accelerometer to the CTU after 6 weeks, the local researcher will telephone the participant to remind them to return the device. Participants who return the accelerometer to the CTU will receive an online/high street store voucher for £20 as a token ‘thank you’, to maximise response rates.

    Trial treatment/trial arms

    Intervention: web-based support plus ERS (e-coachER)

    e-coachER is a web-based support package, which offers a range of interactive opportunities to enhance participants’ motivation to take up the ERS and to maintain a more physically active lifestyle, whether or not they engage with their local ERS. A logic model for the intervention is shown in figure 2.

    e-coachER is primarily a self-delivered intervention and comprises the following components:

    • A mailed ‘Welcome Pack’ that contains a user guide and the participant’s unique user log-in; a simple pedometer (step-counter) and a notepad to record daily physical activity (appended to a magnet with study-specific branding). Participants are encouraged to make use of the pedometer and the activity record sheets for self-monitoring and goal setting in conjunction with the e-coachER website.

    • The e-coachER website (on the LifeGuide platform). At the core of e-coachER are seven ‘Steps to Health’ lasting approximately 5–10 min each, designed to: encourage participants to think about the benefits of physical activity (motivation); seek support from an ERS practitioner, friends/family and the internet (support/relatedness); set progressive goals; self-monitor physical activity with a pedometer and upload step counts or minutes of MVPA (self-regulation, building confidence/autonomy); find ways to increase physical activity more sustainably in the context of day-to-day life and deal with setbacks (building confidence). The sequential content, objectives and how this was implemented were mapped against a taxonomy for behaviour change techniques30 (table 2). Self-determination theory underpins the intervention with core aims in every step and interaction with participants, aiming to build confidence, autonomy and relatedness.31

      Participants are encouraged to use the e-coachER support package as an interactive tool by using preset or user-defined reminders to promote ongoing use of functions such as recording weekly physical activity (minutes of MVPA) and goal setting, and receive messages of encouragement. Prompts are sent to remind participants to review their goals. An absence of engagement (eg, failure to review a goal, or not signing into the website for 1, 2 and 4 weeks) triggers reminder emails to the participant.

      The website content will be locked prior to starting recruitment, with the exception of webpages displaying links to reputable generic websites for further information about the chronic conditions of interest and lifestyle, links to other websites and apps for self-monitoring health behaviour and health as well as modifiable listings of local opportunities to engage in physical activity.

      An avatar is used throughout the content to avoid having to represent a range of individual characteristics such as age, gender and ethnicity. The avatar delivers brief narratives to normalise and support behaviour change and encourage use of the e-coachER support package.

    • To maximise accessibility and usage, a local researcher will provide technical support if requested. If a participant does not register on the e-coachER website within the first few weeks, the local researcher will contact the participant to offer support to register. If a participant requires technical support to resolve operational issues with the website (eg, requires a password to be reissued), participants will be referred to a centralised technician within the LifeGuide team.

    Figure 2

    Logic model for e-coachER intervention. ERS, exercise referral scheme; MVPA, moderate- to- vigorous physical activity.

    Table 2

    The e-coachER sequential process and objectives mapped against behaviour change techniques, and explanation of the implementation strategy

    Intervention development, including piloting the Welcome Pack and developing an initial version of e-coachER, was built on wide ranging experiences from the development of other self-management interventions using the LifeGuide platform,32 and beta-testing over 7 months with input from service users. Co-applicants and researchers then provided feedback on a time-truncated version of the e-coachER website, and ERS patients provided feedback on a real-time version, for 5 months before the website was locked for the randomised controlled trial.

    Usual care

    There is currently no single model for ERS in the UK, but the predominant modes of delivery involve referral to a programme (eg, 10–12 weeks) of structured, supervised exercise at an exercise facility (eg, gym or leisure centre) or a counselling approach to support patients to engage in a variety of types of physical activity.11 ERS operate diversely to accommodate patient choice and local availability of facilities, the common goal being to reduce the risk of long-term metabolic, musculoskeletal and mental health conditions due to physical inactivity. The three participating sites were selected from different regions of the UK (different ERS providers) to provide diversity of approach; the schemes are described in table 3.

    Table 3

    Characteristics of the local ERS involved in the study

    Determination of sample size

    In the absence of a published minimally important difference for MVPA, assuming a ‘small’ to ‘moderate’ standardised effect size of 0.35, we estimated that 413 participants are required at 88% power and a two-sided alpha of 5% assuming 20% attrition, or 90% power at a two-sided alpha of 5% allowing for 16% attrition (using ‘sampsi’ in STATA V.14). Given that the intervention is being delivered at the level of the individual participant, clustering has not been factored into the sample size calculation. Based on the baseline SD for MVPA total weekly minutes in ≥10 min bouts of 104–113,33 an effect size of 0.35 would correspond to a between-group difference of 36–39 min of MVPA per week.

    Measures

    Primary outcome measure

    The primary outcome is the number of weekly minutes of MVPA, in ≥10 min bouts, measured objectively by GENEActiv Original accelerometer,34 over 1 week at 12 months post-randomisation compared with the control group. To be included participants need to provide activity recorded over 4 days, including a weekend day, for at least 16 hours/day.

    Additional measures

    • Total weekly minutes of MVPA in ≥10 min bouts, measured objectively by accelerometer, over 1 week at 4 months.

    • Achievement of at least 150 min of MVPA, measured objectively by accelerometer, over 1 week at 4 and 12 months.

    • Achievement of at least 150 min of MVPA over 1 week using the self-reported 7-day Physical Activity Recall Questionnaire at 4 and 12 months.

    • Self-reported weekly minutes of MVPA at 4 and 12 months.

    • Average daily hours of sedentary behaviour measured objectively by accelerometer over 1 week at 4 and 12 months.

    • Self-reported average daily hours of sleep over 1 week at 4 and 12 months.

    • Self-reported health-related quality of life, assessed by the EQ-5D-5L35and SF-12v236 at 4 and 12 months.

    • Self-reported symptoms of anxiety and depression, assessed by the Hospital Anxiety and Depression Scale37 at 4 and 12 months.

    • Uptake of the ERS by participant self-report at approximately 4 weeks and at 4 months, and from ERS records.

    • Adherence to physical activity, using a composite measure to describe the proportion in each arm of the trial that achieved at least 150 min of MVPA in bouts of at least 10 min at 4 months and were still doing so at 12 months.

    Self-reported survey process measures

    • Single and multiple items, using Likert scales, to assess self-efficacy/confidence to be physically active, importance of being physically active, relatedness (perceived frequency and availability of support), perceived autonomy/control over physically active choices, involvement in self-monitoring and planning to do physical activity.

    • In the intervention group, measures of engagement with e-coachER including whether or not the participant visits the website at least once, and whether they reach a stage of the online support to indicate they have set and reviewed at least one physical activity goal. Experience from engagement with other LifeGuide online interventions suggests there may not be an optimum dose of engagement.

    Economic evaluation

    • Cost-effectiveness. Incremental cost of the intervention to the NHS and incremental cost per change in minutes of MVPA (in ≥10 min bouts) and per QALY.

    • An economic evaluation of e-coachER will be undertaken using NHS, personal social services, and patient perspective. The analysis will be twofold—short-term (within-trial) cost-effectiveness analysis (from baseline to 12 months postrandomisation) and long-term cost-effectiveness analysis (beyond-trial modelling of long-term expectations for cost-effectiveness), for e-coachER against ERS. The main outcome of the economic analysis will be an incremental cost per QALY (based on EQ-5D-5L). The short-term cost-effectiveness analysis will use resource use data for development of training of and input from a local LifeGuide facilitator, and central LifeGuide technician; provision and running of the exercise sessions at leisure centres and health and personal social service use. Data will be collected using the e-coachER monitoring system, key informant interviews (including trial manager), review of trial management records and participants’ questionnaires at baseline, 4 and 12 months. Unit costs will be taken from the NHS reference costs (eg, DH 2015/2016),38 standard unit costs39 and published literature. The long-term cost-effectiveness of e-coachER will be based on an existing policy-relevant decision analytical model.40 41 The analysis will account for the impact of physical activity on lifetime risk of developing coronary heart disease, stroke and type 2 diabetes.

    Process evaluation

    The barriers to, and facilitators for, recruitment will be explored with participants in the early stages of the trial through qualitative interviews with local researchers at each site, and also via local researcher field notes of conversations with participants at various stages of the trial. Along with relevant supporting literature, this information will be used to optimise recruitment during the remainder of the trial.

    Following guidelines for evaluating complex interventions,42 a nested mixed methods process evaluation will be undertaken, focussing on identifying factors relating to recruitment, engagement, acceptability, mechanisms and fidelity.

    The assessment of barriers and facilitators in recruitment will involve the following:

    1. Interviews with researchers about patient-reported reasons for joining the study or not;

    2. Interviews with researchers about barriers to recruitment in the primary care setting, and among exercise referral practitioners.

    The logic model shown in figure 2 will guide the process evaluation of the intervention. The logic model shows the types of data that will be collected, as well as the causal pathways proposed to contribute to behaviour change and intervention outcomes.

    The assessment of intervention engagement and acceptability will involve the following:

    1. Semi-structured interviews with up to 10% of the intervention group participants. A purposeful sampling framework will be used to ensure participants with a range of characteristics (gender, age, underlying health condition and trial centre) are invited to take part. Interviews will be conducted at different stages of participation in the trial, with each individual being invited to participate in telephone interviews and if appropriate follow-up interviews (up to a maximum of three telephone interviews over the course of the intervention period (approximately 4 months). Interviews will be recorded and transcribed and personal data or ways of identifying participants removed. Transcriptions will be imported into NVivo for data management purposes. The interview transcripts will be coded and thematic analysis performed to identify key findings. Analysis will initially focus on ‘top level’ themes, reflected in the intervention logic model. Analysis will follow the principles of Framework Analysis.43 Further in-depth analysis will also be undertaken in order to ensure emergent data, for example, from longitudinal cases, or condition-specific themes, are explored fully. The focus of the interview questions will be linked to the phase of the intervention, and seek to identify the perceived value of the ‘Welcome Pack’ and contents in helping to access e-coachER, the overall web-based support and each of the Steps to Health, in terms of functionality and utility to support behaviour change. Participants will be asked to identify if and how they thought e-coachER provided support for their ERS, and maintaining physical activity in addition to and beyond the ERS support. Ideas for additions or revisions to e-coachER will be requested. Questions will also focus on the participants’ perceived development of self-regulatory skills (eg, self-monitoring, goal setting) and the extent to which the intervention enhanced a sense of competence, autonomy and relatedness, thereby linking back to the aims and guiding principles of the e-coachER intervention.

    2. The researchers will be asked to maintain field notes on any interactions with participants concerning engagement with the intervention, such as any difficulties faced with accessing the intervention website. Semi-structured interviews will be conducted by the qualitative researcher with the researchers at each recruitment site to identify participant barriers and facilitators to using e-coachER.

    3. Engagement with the web-based e-coachER support system will be quantified. Metrics such as whether the participant registered, how far they progressed in the seven Steps to Health, visits to and time spent on different web pages and within each of the respective Steps, number of times step counts or amount of physical activity (eg, MVPA) were entered into e-coachER (ie, self-monitoring) and number of times goals were achieved and reviewed.

    4. Changes in the process measures (see above) (eg, self-efficacy/confidence to be and importance of being physically active) from baseline to 4 and 12 months follow-up will be assessed and compared between intervention arms.

    5. Mediation analysis to determine the extent to which changes in the process measures mediate the effect of the intervention on changes in physical activity at 4 and 12 months.

    Data handling

    Data will be collected and stored in accordance with the Data Protection Act 1998/General Data Protection Regulation 2018.

    Subject numbering

    Following receipt of expression of interest, each patient will be allocated a unique number and will then be identified in all study-related documentation by their identification number and initials. A record of names, addresses, telephone numbers and email addresses linked to participants’ identification numbers will be stored securely on the study database for administrative purposes only.

    Data collection

    Data will be recorded on study-specific paper-based case report forms (CRFs) by the local researcher, and participants will complete a paper-based questionnaire booklet comprising validated and non-validated self-report outcome measures (listed in table 1).

    Accelerometers will be configured for use prior to issue to participants by the local researcher at baseline and the CTU thereafter, using GENEActiv software. A recording window of 10 days, recording at 75 Hz, will be preset, thus accounting for transits in the post while optimising the battery life of the device.

    Accelerometers received by the CTU following 1 weeks’ wear by the participant will be physically cleaned with liquid detergent (according to manufacturer’s instructions) before data are downloaded via GENEActiv software and linked to participant identification number. Accelerometers will then be issued to other participants in the trial as required.

    Data on participants’ uptake of the ERS will be collected via a single use token-based authenticated email sent to participants at 4 weeks post-baseline. This will be a short survey requesting information on whether the participant has attended the initial consultation with the ERS advisor, and predefined reasons for non-attendance status, for example, appointment has been booked but not yet attended.

    All persons authorised to collect and record study data at each site will be listed on the study site delegation logs, signed by the Principal Investigator.

    Data entry

    Original CRFs and questionnaire booklets will be posted to the CTU, with copies of the CRF retained at the study site. All data will be double-entered by CTU staff on to a password-protected SQL Server database and encrypted using Secure Sockets Layer. Double-entered data will be compared for discrepancies using a stored procedure and discrepant data will be verified using the original CRF. Incomplete, incoherent, unreadable or other problem data in the CRF pages will be queried by the CTU with study site staff during data entry to ensure a complete and valid dataset. Self-reported data in the questionnaire booklet will not be queried with participants.

    The CTU may complete further validation of data items, perform logical data checks and raise further data queries after data collection has been completed. The final export of anonymous data will be transferred to statisticians for analysis after all data cleaning duties have been performed by the CTU.

    Data analysis plan

    All analyses will be carried out using a detailed a priori statistical analysis plan. Analyses will be reported in full and in accordance with the  Consolidated Standards of Reporting Trials (CONSORT) guidelines.44 Recruitment, uptake of the ERS, engagement with the intervention, outcome completion rates and study withdrawal will be reported (with 95% CIs). Baseline characteristics in the two trial arms will be reported.

    The primary analysis will compare complete case outcomes between intervention and control arms groups according to the principle of intention to treat (ie, according to original randomised allocation) at 12 months adjusting for baseline outcome values and stratification and minimisation variables (recruitment site and disease indication).

    Secondary analyses will be undertaken to compare groups at follow-up across all follow-up points (ie, 4 and 12 months) using a mixed effects repeated measures approach. In addition, we will seek to undertake secondary per-protocol analyses using a complier average causal effect approach to examine the impact of different levels of the adherence to the intervention.

    Accelerometry data will be analysed with bespoke software to classify data into levels of physical activity intensity using accepted cut-points. Standard operating procedures will be applied to make a decision about dealing with missing data.

    The primary analysis model will be extended to fit interaction terms to explore possible subgroup differences in intervention effect in stratification and minimisation variables and the predefined baseline characteristics. As not formally powered, these subgroup analyses will be regarded as exploratory and hypothesis-generating.

    Sensitivity analysis, using multiple imputation and assuming unobserved measurements are missing at random will be conducted for both primary and secondary analyses to assess the likely impact of missing data on the primary and secondary outcomes at 12 months. Contemporary mediational analysis methods45 will be used to explore the impact of process outcomes identified in the planned intervention components, including engagement, use of behaviour change techniques and motivation and processes of change (eg, self-efficacy, autonomy, relatedness).

    No interim analysis of primary or secondary outcomes is planned. No adjustment of p-values will be made to account for multiple testing, although the implications of multiple testing will be considered when evaluating the results of the analyses. Analysis of the primary outcome will be performed prior to all other analyses. All analyses will be undertaken using STATA V.14.2.

    Checks will be undertaken to assess the robustness of models, including assessment of model residual normality and heteroscedasticity.

    Patient and public involvement

    The research question was informed by patient and public involvement (PPI) over many years. Individual and group interviews were conducted with patients to identify the barriers and facilitators associated with ERS, and what additional support could help maintain physical activity for a variety of chronic conditions. Our extensive engagement with ERS practitioners allowed us to understand the individual variability and collective patient experience of ERS. This included one of the authors developing, delivering and adapting a training course for ERS practitioners based on their feedback.

    The LifeGuide team worked extensively with PPI representatives to develop the appropriate support, concluding that ERS patients would appreciate additional support from an ERS to help them to further develop the independent motivation to maintain physical activity, involving a broad range of active options. Also, patients widely indicated that the LifeGuide web-based system can provide appropriate support for making health behaviour changes. Typically ERS can increase health inequalities by limiting access to those who have limited disposable income or have restricting physical and mental health conditions. The e-coachER system was designed to support those with such restrictions.

    Patients were involved in the design of the study. A PPI group was involved in the initial development and refinement of the e-coachER web-based behavioural support. Patients with experience of being referred for an exercise programme, took part in focus groups and provided direct feedback on iterations of the e-coachER intervention during its development.

    We engaged with over 20 ERS patients who volunteered to pilot the e-coachER Welcome Pack and provide feedback on the e-coachER website. A PPI representative was available to provide opinions on the study protocol and patient-facing documentation (eg, Participant Information Sheet) during the set-up of the study.

    Patients are involved in the oversight of study progress and conduct via representation at periodic Project Management Group meetings and Trial Steering Committee meetings.

    Results will be disseminated to study participants. At the end of the trial, a plain English summary of the study results will be made available to participants via a designated webpage on the Peninsula Clinical Trials Unit website, and emailed or posted to participants on request.

    Trial monitoring and oversight

    A Project Management Group including the Chief Investigator, Principal Investigators, co-applicants, CTU Trial Manager, ERS advisor and PPI representative will meet quarterly to provide multidisciplinary input and oversight for the study.

    A Trial Steering Committee (TSC) including an independent chair, independent clinicians and/or academics with relevant expertise, independent statistician/methodologist with relevant expertise and a representative contributing a patient/public perspective will oversee the conduct and scientific integrity of the trial. The TSC will review study progress and protocol adherence. Each committee will function in accordance with agreed terms of reference set out in a charter.

    An independent Data Monitoring Committee (DMC) will monitor the safety and ethics of the trial by overseeing recruitment, primary outcome data completeness and serious adverse event data.

    The committees will meet once before the start of the trial and approximately annually thereafter.

    Ethics and dissemination

    Safety considerations

    The recording and reporting of non-serious adverse events in this study will not be required. Serious adverse events (SAE) will be captured via survey-specific items on hospital admissions in the questionnaire booklet at 4 and 12 months, that is, reason and duration of the inpatient stay, and self-reported relatedness of the SAE to participation in the trial; self-report independent of the questionnaire booklet; notification to the local researcher by the participant’s relative/advocate or notification by the participant’s GP.

    Reports of SAEs will be provided to the CTU. The CTU will liaise with the local researcher who will be responsible for ascertaining further details about the SAE as appropriate. The Chief Investigator will report any SAE that is related (definitely, possibly or probably related) to the research procedures to the Research Ethics Committee within 15 days of becoming aware of the event. The CTU will prepare quarterly summaries of SAEs for review by the independent DMC and Sponsor.

    Dissemination plan

    The findings of the study will be made publicly available through publication in relevant peer-reviewed journals and the NIHR Journals Library website; and presentation to the scientific community, patient support groups, the ERS services and NHS strategy forums at local and national level. The study is reported in accordance with CONSORT guidelines for publishing randomised trials and TIDieR guidelines for intervention reporting.

    A plain English summary of the main study results will be made available for participants and other lay audiences.

    Changes to the protocol after the start of the trial

    Primary outcome measure and sample size

    The original protocol featured an internal pilot. During the internal pilot phase, 180 patients were to be recruited over 3 months to provide sufficient information to justify progression to a main trial. Progression from the internal pilot to the main trial was dependent on recruitment rate and engagement with the intervention according to the scenarios in table 4. In the main trial, an additional 1220 participants were to be recruited, giving a total of 1400 participants (recruited over 16 months).

    Table 4

    Internal pilot to main trial progression rules

    The recruitment rate during the internal pilot phase was lower than expected, due to limitations on the time primary care practitioners had available to approach potential participants; delayed start at one of the research sites; poor uptake when patients were approached via a postal mailshot; high ineligibility rate among patients who were identified via a primary care database. In response to poor recruitment, the following strategies to increase recruitment were introduced:

    • The inclusion criterion for BMI was aligned with the ERS entry (upper BMI limit for the trial was originally 35 and was raised to 40), and prediabetes was included as an inclusion criterion.

    • Recruitment via the ERS service, which was already taking place at the site in Greater Glasgow, was adopted in the West Midlands and the South West in addition to recruitment via primary care.

    • Incentive payments to participants (for returning an accelerometer) were increased from £10 to £20 per accelerometer.

    Having implemented these measures, the conditions for progression in terms of recruitment rate and engagement with the intervention were not met by the end of the internal pilot phase, despite a 4-month extension period. A ‘recovery plan’ was developed in collaboration with the funders, based on amending the choice of primary outcome, and submitted in May 2016.

    The original primary outcome was achievement of at least 150 min of MVPA measured objectively by accelerometer over 1 week at 12 months. This outcome was based on the findings of a systematic review of ERS12 46 demonstrating that trials had primarily reported their outcomes according to percentage of participants reaching the National Institute for Health and Care Excellence guidelines for physical activity level, that is, 150 min of MVPA per week. We estimated that recruiting 700 participants per group would allow us to detect a difference at 12 months follow-up of at least 10% (intervention group: 53% vs control group: 43%), assuming an attrition rate of 20% and small effect of clustering (intracluster correlation coefficient ICC: 0.006) at 90% power and 5% alpha. Thus, the original sample size was 1400 participants, to be recruited over 16 months.

    From the outset, the TSC and DMC had recommended that this dichotomous primary outcome measure be replaced with a continuous variable; total weekly minutes of MVPA. This was because:

    1. A continuous primary outcome measure would be more relevant in this study population, in terms of detecting a small but clinically significant increase in minutes of MVPA.

    2. Based on sample size calculations, this would offer greater statistical power than to the categorical assessment of whether participants reach a threshold of 150 min of MVPA. This would therefore afford a reduction in sample size.

    The TSC and funders agreed these changes (in August 2016) and the original sample size was reduced in accordance with this new primary outcome measure and revised sample size calculation, from 1400 to 413 participants (to be recruited over 21 months). A similar reduction in sample size has been incorporated into the qualitative component of the process evaluation work.

    Current study status

    The e-coachER trial began recruiting patients in August 2015 and closed to recruitment in March 2017. Data collection is expected to be completed in March 2018 and results are expected to be published in September 2018.

    Acknowledgments

    The authors would like to thank all the patients and staff who are participating in the trial and also to the members of the Trial Steering Committee and Data Monitoring Committee for their valuable support throughout the lifetime of the research. The authors would like to acknowledge the role of the Clinical Research Network in connection with data collection and also the contribution made by the Department of Health and the Greater Glasgow Health Board in meeting the excess treatment and service support costs associated with the trial. In memory of Nigel Charles, with thanks for his contribution to the qualitative research.

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    View Abstract

    Footnotes

    • Contributors AHT conceived the idea for the study with RST, NM, KJ, LY, NA, JLC, CG, SGD, PL, AW/JE, BJ, JLC and RBJ. AHT, RHT, NM, KJ, LY, NA, JLC, CG, JV, SGD, CM, PL, JE, BJ, JLC, AW, RBJ, WI and DW contributed to the final study design and development of the protocol. AHT, JDL, MS and LY developed the web-support and led PPI testing and feedback with JK. NA developed the health economics plan. SGD developed the process evaluation plan with CG, NC and RHT. RHT provided the statistical plan. All authors critically revised successive drafts of the manuscript and approved the final version.

    • Funding This research has been conducted independently by the University of Plymouth, University of Birmingham, Brunel University London, University of Edinburgh, University of Exeter, University of Southampton, Royal Cornwall Hospitals NHS Trust and University of St Mark and St John. It is funded by the Department of Health (DH) as part of the National Institute for Health Research (NIHR) Health Technology Assessment (HTA) programme (project number 13/25/20).

    • Disclaimer The views expressed are those of the author(s) and not necessarily those of the NHS, the NIHR or the Department of Health.

    • Competing interests SGD reports personal fees from University College London outside the submitted work. CM reports grants from NIHR during the conduct of the study; grants from ESRC Impact Acceleration Award outside the submitted work; is an employee of the Health Improvement Team (NHS Greater Glasgow & Clyde) who fund and manage the Service Level Agreement for the Exercise Referral Scheme. NM reports grants from various research funders including NIHR during the conduct of the study. LY reports grants from NIHR during the conduct of the study.

    • Patient consent Not required.

    • Ethics approval The original study and subsequent amendments were approved by the NHS Research Ethics Committee North West-Preston (REC reference 15/NW/0347).

    • Provenance and peer review Commissioned bid 13/25 Interventions to enhance engagement in exercise referral schemes.

    • Collaborators Trial Steering Committee Full members: Dr Sharon Simpson, Chair (University of Glasgow); Professor Charlie Foster, Independent Member (University of Oxford then University of Bristol); Dr Mark Kelson, Independent Member (Cardiff University then University of Exeter); Professor John Powell, Independent Member (University of Oxford); Mr Chris Cavanagh, Patient and Public Involvement Representative; Professor Adrian Taylor, Chief Investigator (University of Plymouth) Observers; Professor Rod Taylor, Trial Statistician (University of Exeter); Dr Wendy Ingram, Trial Manager (Peninsula Clinical Trials Unit, University of Plymouth); Mrs Pam Baxter, Sponsor Representative (University of Plymouth) Data Monitoring Committee members; Professor Paul Aveyard (University of Oxford); Dr Anne Haase (University of Bristol); Professor Richard Morris (University of Bristol).

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