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Strengths and limitations of this study
Limited data exist regarding adherence to and the clinical effects of, multimodal exercise interventions in preillness sedentary patients with cancer undergoing chemotherapy.
Cardiorespiratory fitness represented as VO2-peak is the primary outcome. To ensure valid and reliable data, cycle ergometer testing and direct continuous measurements of respiratory gas exchange will be utilised at baseline and after the 12-week intervention.
The qualitative evaluation of the patients’ motivation for and participation in, the exercise interventions will serve as a basis for validating and monitoring the two interventions.
The size of the population in this feasibility study is limited and therefore no conclusion can be drawn regarding the efficacy of the interventions. Furthermore, the present study is not powered to draw conclusions of causality.
A randomised controlled trial is planned upon completion of the feasibility study.
Breast and colon cancers are two of the most common cancers, with 4637 patients with breast cancer and 2551 with colon cancer diagnosed annually in Denmark in 2011.1 Improved cancer treatment has increased the number of survivors with an expected 5-year survival rate of 79% for patients with breast cancer and 52% for patients with colon cancer.1 ,2
Several clinical studies exploring the effectiveness of antineoplastic drugs and related toxicity have found that treatment-related symptoms and side-effects (pain, arthralgia, neuropathia,3–6 fatigue,7–10 nausea and vomiting11 ,12 weight gain13 ,14 myelosuppression and febrile neutropenia,15 ,16 skin rash and skin toxicities17 ,18) may occur at moderate-to-severe intensity, and with significant prevalence among patients undergoing adjuvant chemotherapy. Furthermore, antineoplastic treatment is synonymous with an inactive daily life for a substantial number of patients19 and it has been shown that psychological symptoms of anxiety and depression are significantly elevated.20–22
During the last decades, exercise oncology has emerged with significant growth due to its potential to alleviate symptom burdens, improving health throughout the cancer continuum and for supporting cancer survivorship.23–27 A recent Cochrane review found that the potential benefits of exercise are not homogenous across cancer populations, although exercise interventions of moderate-to-vigorous intensity appear to favour positive outcomes (physical functioning, role functioning, social functioning, fatigue) compared with low-intensity exercise programmes.28 In addition, observational studies have consistently suggested that regular physical activity among patients with breast or colon cancer may reduce the incidence and risk of relapse.29–32 Other studies have found an elevated-to-high prevalence of predisposing lifestyle factors (weight gain, hypertension, metabolic dysfunction, physical inactivity, smoking) and an increased risk of developing heart disease among patients with cancer.33 ,34 These important clinical and lifestyle-associated factors necessitate the integration of lifestyle modifications in the oncology rehabilitation field35–38 and the promotion of increased physical activity for sedentary cancer survivors. So far, only few studies incorporates patients with colon cancer during adjuvant chemotherapy.39
Denmark-Wahnefried et al’s40 review, ‘Riding the Crest of the Teachable moment’ suggests that cancer survivors spontaneously adopt lifestyle changes (ie, smoking cessation, diet and physical activity) in the hope of attaining improved health. This gave rise to defining the period of diagnosis as ‘the teachable moment’40 ,41 and has been documented in clinical studies.42 Results from own research confirm that newly diagnosed patients seek self-management strategies when facing their cancer diagnosis.43–47 However, it remains unclear what the optimal setting, dosage and combination of exercise and health promoting components that may best facilitate patient adherence, symptom management, sustainable lifestyle changes and long-term health effects in this at-risk population of physically inactive patients with cancer.
The purpose of the present study was to investigate the feasibility of oncologists/nurses screening for physical inactivity, in order to identify and recruit an at-risk population of sedentary patients with breast or colon cancer. The target group will comprise of patients with breast or colon cancer receiving adjuvant chemotherapy that, at 3 months prediagnosis, did not adhere to national recommendations for physical activity based on self-report (150 min of regular and moderate recreational physical activity and at least 2×20 min of strenuous exercise per week).48 Furthermore, the study will examine the adherence to one of two multimodal exercise interventions lasting 12 weeks with the first being a hospital-based, high intensity, group exercise intervention and the second being a home-based, low intensity, individual, pedometer intervention. The goal of the exercise intervention is to (1) increase physical capacity (VO2-peak), physical activity, functional level and well-being, (2) reduce symptom and side-effect burden and (3) encourage sustained lifestyle changes. Both arms will be compared with a randomly selected control group.
Design and methods
Participants and setting
Forty-five screened patients with colon or breast cancer referred to adjuvant chemotherapy, with performance status 0–1, and verified as physically inactive, will be recruited from the oncology department at the Copenhagen University Hospital (Rigshospitalet). Patients with breast cancer with positive or negative oestrogen receptors and regardless of their human epidermal growth factor receptor 2 status will be recruited for the study. Likewise, patients radically operated for stages II and III colon or upper rectum cancer, with or without ostomy construction, will be recruited. All patients will undergo standard or protocol adjuvant chemotherapy, for example, three series of epirubicin and cyclophosphamide followed by three series of docetaxel as standard treatment for breast cancer or six series of docetaxel plus cyclophosphamide if receiving the READ protocol.49 Patients with colon cancer typically undergo 12 series of FOLFOX (oxaliplatin and 5-FU (5-flourouracil) and folinic acid) or six series if entering the SCOT protocol.50 Patients with colon cancer receiving adjuvant capecitabine may also be eligible candidates. The administered chemotherapy doses will be registered prospectively using predesigned forms and the use of all supportive care will be recorded including growth factors, antiemetics and analgesics.
All newly referred patients with cancer will be screened for sedentary behaviour using national recommendations48 by treating nurses/physicians (figure 1) and encouraged to initiate or continue physical activity during treatment. Patients reporting physical activity levels below the recommended level will be referred to the research team and matched against the exclusion criteria. These criteria are in accordance with well-established screening criteria for symptomatic competitive cardiac diseases and comorbidity developed during the ‘Body & Cancer’ programme in Denmark.51 Furthermore, these criteria are based on general guidelines for cardiorespiratory exercise testing in clinical oncology research52 (ie, symptomatic cardiac disease, persistently elevated blood pressure with diastolic pressure >100, angina, receiving nitroglycerine, irregular heartbeat and pathological resting pulse >110, acute coronary heart syndrome within the last 6 months or pathological ECG changes). Patients with a history of cardiac disease will be discussed with their primary attending oncologist before entering the study.
Written and oral information regarding study rationale, ethics, randomisation and group allocation will be delivered by the primary investigator. Following receipt of informed written consent prior to the baseline visit, patients will be scheduled for a 3.5 h baseline test session comprised of (1) fasting full body dual-energy x-ray absorptiometry (DXA) scan; (2) fasting blood glucose, insulin, lipids and cholesterols; (3) physiological testing (VO2-peak, muscle strength and lung capacity) and (4) patient-reported outcome (PRO) questionnaires. Baseline tests will be performed at the Department for Nuclear and Physiologic Medicine and at our training facility located at the Copenhagen University Hospital (Rigshospitalet). A clinical nurse specialist will examine current health, immune and infection statuses prior to the physiological assessments. Upon infection, ongoing antibiotic treatment or presence of ‘drug’ (chemotherapy)-related vasovagal complaints or irregular pulse or blood pressure, the physiological assessment will be delayed pending complete recovery. Following the baseline test, a brief feedback of the test results will be provided before randomisation and group allocation.
Following baseline testing, patients will be sequentially numbered, stratified by diagnosis and randomised (equal weight 1:1:1) by a computer programme located in the Copenhagen Trial Unit (CTU). Patients will be allocated to one of the three study groups: (1) a hospital-based, supervised group exercise intervention of moderate-to-high intensity three times weekly, health promotion counselling and symptom management coaching or (2) a home-based individual pedometer programme, health promotion counselling and symptom management or (3) a control group (table 1).
The study will enrol 45 patients, for example, 30 patients with breast cancer and 15 patients with colon cancer. The feasibility study will serve as a platform for programme feasibility and will be adjusted prior to a planned randomised controlled trial (RCT). The reason for including a control group in the feasibility study is based on earlier experience with own interventional exercise research, where it has been found that patients allocated to a control group, to a considerable extent, refuse to participate in a research exercise programme unless they are offered to participate in the intervention following the study period.
Blinding, masking and data protection
Personnel conducting follow-up testing will be blinded to study arm assignment. An oncology nurse specialist will enter physiological variables, PRO questionnaires and clinical data (disease and treatment data from medical records) into a database hosted by the CTU, who exclusively has access to unblinded data. The research team and testing personnel will have limited access to data, with approved access from the CTU only provided to the trial statistician (KBC) and the primary investigator (TM) on completion of the intervention. Printouts of baseline characteristics may be approved by the CTU in order to identify and describe patients selected to participate in the semistructured qualitative interviews. Qualitative investigations at 12 weeks will be performed by a researcher not involved in the intervention (LA) and at follow-up (KB; 39 weeks from baseline testing).
Exercise training protocols (general considerations)
A large observational study that prospectively examined physical activity levels in relation to mortality among 252 925 women and men aged 50–71 years, demonstrated that individuals who undertook 30 min of daily, moderate physical activity reduced their mortality rate by 30% compared with physically inactive individuals.53 Furthermore, the study found that individuals who had engaged in high-intensity exercise of 3×20 min weekly, reduced their mortality rate by 50% compared with inactive persons.53 As such, there appears to be a health gain potential related to both moderate and high-intensity physical activity. Physiological markers (VO2-peak, heart rate, etc) are useful measures of moderate and high-intensity training with the largest gains seen at highest intensity levels (85–95%). Low-intensity training (60–85%) can similarly result in fitness gains; however, gains are less pronounced.54–57
Study arm 1
Supervised hospital-based group exercise intervention+health promotion counselling and symptom management (6 weeks; 9 h/week+6 weeks; 6 h/week) n=15: patients will be offered a 12-week exercise programme at our training and testing facilities located adjacent to the Copenhagen University Hospital. Training sessions, in groups of 10–14 patients, will be supervised by an exercise physiologist/physiotherapist (CL) and a clinical nurse specialist with experience in oncology and exercise (CA). The training protocol is founded on a well-tested 6-week exercise programme entitled ‘Body & Cancer’51 that has been offered to patients with various cancer diagnoses since 2007. The first 6 weeks (Part 1; 9 h/week) will include three training sessions per week comprising of high-intensity/low-intensity components: warm-up, resistance training, cardiorespiratory training, relaxation and massage, as well as one restorative session per week (for details see previous publications51 ,58). The total training volume will correspond to 43 MET hours per week.51 An ‘all-sports’ training element including ball games, dance and circuit training will be introduced during the last 6 weeks of the intervention (Part 2; 6 h/week) with a total training volume of 40 MET hours per week. Furthermore, patients will receive individual health promotion counselling and symptom management (Part 3) at baseline, 6, 12 and 39 weeks. Pre-exercise screening: This will take place before each session that involves moderate-to-high-intensity physical training.51 ,58
Part I: Cardiorespiratory training
Training will predominantly be performed on stationary bikes (Monarch). Cardiorespiratory training, with the exclusion of a short warm-up, will involve interval training on stationary bicycles with a workload of 70–250 W, equivalent to 85–95% of each patient's HRmax and with a progressive duration of 60–90 min/week for 6 weeks. In cases of malaise or risk of overload, the resistance load will be lowered. All patients will wear a heart rate monitor during training sessions, and heart rate will be continuously monitored during all training sessions in order to measure training intensity.
The aim is to accomplish three continuous sets of 5–8 repetition maximum (RM).59 Loads will be based on the patients’ individual maximum muscle strength measured with the 1 RM test and adjusted every third week applying the results of a new 1 RM test.59 Resistance training will be performed on Technogym equipment (Gambettola, Italy) and will involve chest press; leg press; knee extension; latissimus pull down, lower back extension and abdominal flexion.
The low-intensity training will comprise of three components: relaxation, body awareness training and massage. Relaxation training will be based on principles of progressive muscle relaxation.60 Body awareness training will adopt various themes that focus on the participant's awareness, recognition and body control.61 Massage will be relaxing, facilitative or therapeutic and will include scar tissue massage.62
Part II will expand on part I in terms of cardiorespiratory and resistance training, with the low-intensity components being discontinued. Part II is based on research studies of healthy untrained men and women finding that exercise-based team sports are as effective as running, in promoting physical capacity and cardiorespiratory health.63–65 Improvements in aerobic capacity appear to be independent of exercise type, but rather are dependent on duration, frequency and intensity.66 The all-sports training component will encompass three different themes that each will constitute six training sessions. Based on MET calculations67 the activities will be equivalent to 21–27 MET hours per week. The first theme will focus on various ball games, including competitive elements, and will provide an estimated intensity of 7–9 MET hours. Theme two will focus on dancing activities (eg, zumba) and will render an estimated intensity of 7–9 MET hours. Theme three will comprise of different circuit training games, rendering an estimated intensity of 7–9 MET hours.
Study arm 2
Home-based individual progressive pedometer intervention, health promotion counselling and symptom management: n=15 (table 2).
Individual pedometer instruction will be provided by a clinical nurse specialist at our facility. With the pedometer we hope to facilitate, motivate and enhance physical activity levels during chemotherapy. Furthermore, the goal of pedometer use is to promote sustainable long-term behavioural change post-treatment, by integrating exercise in activities of daily living. The overall goal is to avoid physical inactivity and to achieve 10 steps/day, five times per week, equivalent to a low/moderate recreational physical activity level of 30 min/day.68 The patients will: (1) be issued a pedometer as well as scheduled instruction and evaluation; (2) receive individual face-to-face and telephone health promotion counselling, including clinical advice concerning symptom management from a clinical nurse specialists (TM and CA) within oncology-exercise (at baseline, and at weeks 6, 12 and 39). Patients will be allowed to increase their physical activity and may attend municipality-led rehabilitation programmes when recommended as part of their standard care.
Patients will be requested to maintain their normal physical activity levels during the first week as these will serve as baseline measurements for weekly evaluations. A plan for increased physical activity will be made during face-to-face evaluations at weeks 2, 4, 6 and 12. Patients will be encouraged to increase their physical activity levels stepwise, by at least 25% compared with their baseline levels. Pedometer steps are entered into a computer-based programme that can visualise the patient’s exercise achievements on a daily, weekly and monthly basis.
Health promotion counselling and symptom management
Health promotion counselling will be provided to the patients in study arms 1 and 2. The counselling component is inspired by Albert Bandura's Social Cognition Theory and construct of self-efficacy that considers every individual as proactive, reflective and self-regulating. Further, this theory holds that expectations of own abilities, and experience of competence to act and to set goals are essential to human behaviour and behavioural change.69 ,70 The theoretical basis of Bandura’s theory is detailed in Marcus et al’s71 ,72 construction of ‘Exercise Self-efficacy’ while behavioural change, according to Prochaska, is realised in a circular process consisting of precontemplation, contemplation, preparation, action and maintenance.72–74
In addition to repeating information regarding the benefits of physical activity during and after treatment (as per the Global Strategy on Diet, Physical Activity and Health59), counselling sessions will incorporate the following aspects: (1) exploration of barriers and promoting of short-term and long-term adoption of adequate exercise levels75; (2) the experience of burdensome side effects, with special emphasis on uncovering unmet needs for medical support during phases of chemotherapy; (3) anxiety, stress and stigma;43 (4) actual and post-treatment employment and social integration76 and (5) healthy lifestyles (smoking cessation, dietary guidance, alcohol consumption), including information regarding municipality-based rehabilitation programmes.77 Health promotion counselling and symptom management will take place at baseline and during weeks 6, 12 and 39.
Study arm 3
Control group n=15: The control group will receive standard care with no restrictions regarding participation in physical activity. Patients allocated to the control group will be considered wait-list patients during the 12-week study period. Owing to ethical considerations and growing scientific evidence that exercise interventions benefit motivated patients with cancer and survivors in Denmark,51 ,78 the control patients will be offered participation in ‘Body & Cancer’. Time points for study assessments among control group patients will be on par with the intervention patients.
Study goals and assessments
Primary outcome VO2-peak
To determine VO2-peak, an incremental test on a cycle ergometer (Monark, ergomedic 839E) will be carried out by an exercise physiologist/physiotherapist. The test will consist of a warm-up phase lasting 4–10 min at a submaximal load (30–80 W). Once a steady state is achieved during warm-up (monitored by heart rate), the load will be increased following a short break (<2 min) by 5–20 W every minute until exhaustion or symptom limitation (eg, dizziness, sudden pain and vomiting sensation). Expired gases will be analysed continuously by a metabolic breath-by-breath analysis and calculated as an average over 15 s using the Oxycon Pro, Jaeger measurement system. During the VO2-peak test, oxyhaemoglobin saturation and heart rate will be continuously monitored. After each test, maximum ventilation, respiratory exchange ratio, plateau in the increase in VO2 and HRmax (Polar Team System 2, Polar, Finland) will be recorded.79–81 Self-perceived exertion will be evaluated using the modified Borg Scale (table 3).79
The oncologists will have the overall responsibility for their respective patients’ participation in the project. A clinical nurse specialist will screen patients before initiating any VO2-peak test. Pretest procedures will include an assessment of general well-being, infections (temperature raise higher than 38°C, receiving antibiotics) and/or irregularities in the cardiorespiratory circuit (resting blood pressure, resting heartbeat). Furthermore, haemoglobin will be measured using Hb201+ (HemoCue, Denmark), and haemoglobin levels below 5.5 mmol/L will disqualify patients from VO2-peak exercise testing. Finally, prior to the VO2-peak test, pulmonary function will be determined using standard spirometry in a standing position using the Oxycon Pro, Jaeger measurement system.
PROs: PROs are assessed at baseline, 6, 12 and 39 weeks. PRO questionnaires will be coded according to questionnaire manuals. Procedures for data entry and audit have been developed to ensure data keying.82
The European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC QLQ-C30),83 comprises five functional scales, nine symptom scales or items and a global health status/quality of life scale with additional breast cancer-specific EORTC BR2384 and colon-rectal cancer-specific EORTC CR29.85 General well-being is assessed with the Medical Outcomes Study Short Form 3686 which contains eight scales measuring general health concepts and two summary scales: a physical component scale and a mental component scale.
The perception of pain will be measured on a weekly basis by the Brief Pain Inventory BPI.87
To assess psychological well-being, Hospital Anxiety and Depression Scale88 with 14 items will be administered, designed to measure general anxiety and depression for use in investigations in patients with physical illness.89 ,90
Leisure time physical activity level is explored by a questionnaire item classifying patients as: sedentary (completely inactive); walking or cycling for pleasure; regular physical exercise at least 3 h a week; or intense physical activity more than 4 h a week.81 ,91
PROs will also include validated questionnaires of motivational readiness and ability and barriers to engage in exercise activities ‘stages of motivational readiness’71 ‘decisional balance’92 and ‘exercise self-efficacy’.71 ,72 Social support and network will be measured with ‘The Multidimensional Scale of Perceived Social Support’.93 Additional questionnaires will assess sociodemographic and lifestyle characteristics, workforce attachment and work ability.76
Strength will be measured by the 1 RM test.59 The tests will be performed on Technogym equipment (Gambettola, Italy) and will involve chest press; leg press, knee extension and latissimus pull down.
Pedometer: Total steps and aerobic steps will be measured using the Omron Walking Style Pro step counter.
Fasting DXA scans will be performed at the Clinical Nuclear and Physiological Department of Copenhagen University Hospital (Rigshospitalet). Bone density, lean body mass, total muscle mass or fat mass is increasingly being used as a primary endpoint in health promotion intervention studies in healthy and clinical populations, including patients with prostate cancer94 and postmenopausal women with breast cancer.95 Fat mass has been shown to be directly associated with mortality; however, this may be counteracted by the skeletal muscles as an active organ that prevents negative health effects of fat.96 ,97 Previous studies have predominantly used body mass index, however, recent studies clearly show that a more detailed assessment of body composition is required for investigating overall health effects.96 ,98
Blood markers including fasting glucose, insulin, cholesterols (high-density lipoprotein, low-density lipoprotein) and triglyceride will be drawn to assess long-term metabolic cardiovascular risks.99
Cancer disease characteristics, morbidity and comorbidities
Detailed clinical information concerning cancer disease characteristics, morbidity and comorbidities, hospital admissions and medical supportive care needs are obtained by clinical nurse specialists from electronic medical records.
Chemotherapy completion rate
Based on medical record entries, information regarding dosage, type and timing of chemotherapy administration will be obtained for each patient, including the use of neutrophils colony stimulating factor (Neulasta), antiemetics and analgesics. Chemotherapy completion rate will be measured throughout the planned period of treatment and beyond the 12-week intervention time frame. This includes observed time intervals between cycles of chemotherapy, planned doses of administered drugs and the overall conduct of scheduled treatments.
Qualitative investigation and methods
Qualitative, semistructured hermeneutic-phenomenological interviews will be held with 15 patients from each of the study groups, during weeks 12 and 39. These interviews will highlight patients’ perspectives about their adaptation to and adoption of, increased physical activity in their daily lives and while undergoing chemotherapy. Exercise habits before cancer diagnosis as well as prior to joining the study will be discussed, as will the patients’ views and experiences with the 12-week intervention. The rationale for absenteeism and/or decision for non-participation in the intervention, including barriers to the same, will be explored as well as physical or/and emotional reactions experienced by the patients during the intervention (discomfort, adverse reactions). In addition, physical, emotional and social barriers that impacted sustaining lifestyle changes will be in focus. Not in the least, the intervention's potential impact on patient decisions to return to the workforce and/or rekindle their social relationships will be discussed. The semistructured interview will be used for monitoring purposes as well as for making adjustments to the exercise components.
Tracking and monitoring adverse events
Pre-exercise screening is routinely performed by a clinical nurse specialist before every training session in order to ensure safety and to pay attention to specific symptoms and side-effects experienced by patients during the high-intensity intervention (ie, dizziness, retching and balance problems). Furthermore, patients are advised and guided to respect their own physical limitations. Specific case report forms are developed to monitor adverse events related to programme participation that subsequently may interfere with chemotherapy adherence or exclude patients from engaging in the intervention and/or daily living activities (eg, musculoskeletal injuries).
Serious adverse events will immediately be reported to the Regional Scientific Committee of the Capital Region and The Danish National Board of Health in accordance with existing legislation. In addition, serious adverse events will immediately be circulated to all research group members for discussion in order to execute a response prior to continuing any testing and/or intervention activities.
In Denmark, there are currently no 12-week hospital or home-based exercise programmes that are routinely offered to patients with colon or breast cancer undergoing adjuvant chemotherapy. Thus no patient will be prevented from accepting the best possible treatment as a complement to adjuvant chemotherapy, or in any way be omitted from receiving the most relevant treatment. Patients who decline participation in the feasibility study can increase their levels of physical activity on par with people who frequent fitness or sports clubs and can participate in municipality-led rehabilitation programmes with a referral from their attending physicians.
The DXA scan exposes patients to weak x-rays (radiation) equivalent to the background radiation (0.01 milliSievert) that an average person is exposed to during 3 days, and is comparable to 1/10th of exposure in the case of a chest X-ray. The increased risk as such is calculated in units per thousand and is not considered to be dangerous.88
Approvals and registration
The project is approved by the Danish Data Protection Agency (j.nr.2011–41-6349) and by the Scientific Committee of the Capital Region (case nr. H-1-2011-131). The feasibility study is registered as a current controlled trial (ISRCTN24901641) and will furthermore be published in accordance with the CONSORT guidelines for RCT publishing.100
The RCT feasibility design is selected in order to examine barriers for recruitment, programme adherence, safety aspects and potential efficacy related to study group allocation and intervention activities for patients with breast or colon cancer referred to adjuvant chemotherapy. Furthermore, quantitative and qualitative findings from the feasibility study may be used to adjust programme components and to determine important primary and secondary outcomes of interest. Results and potential effects along with existing exercise literature during chemotherapy will serve as a basis for power calculations prior to the planned RCT.
The principal analysis of primary and secondary outcomes will employ the intention-to-treat approach and as such will include all available data. Study group assignments will be maintained during the comparison of potential interventional effects. The explorative aspect may include statistical analysis across study groups in order to provide insight into mean values, SD, SD of change scores and the potential application of objective measurement tools and standardised PRO instruments in these patient populations.
Qualitative analytic plan
Patients will be asked for their written consent to be interviewed. All interviews will be tape-recorded and transcribed and the data will remain anonymous. The analysis, which will be inductive and thematic, relates to key theories in behaviour modification and control23 ,74 ,101 as well as self-efficacy69 and social exclusion, inspired by Goffman102 and Giddens.103 It is assumed that 15–20 patients per group will suffice to achieve the data saturation point.104
Cardiorespiratory fitness (CRF) is recognised as being an independent and important health-related component for metabolic coronary heart disease risk outcomes and long-term survival in both asymptomatic low-risk populations as well as in high-risk sedentary populations.105–107 In previous research, we have shown that a comprehensive high–low component exercise intervention may be necessary to improve CRF with derived positive impact on patient reported fatigue, hypothetically driven by linear improvement in vitality.51 As such, it assumes a causal connection with patients with cancer respective physical activity levels and a potentially strong interaction with physiological and psychological outcomes.108 ,109 Thus, CRF measured as VO2-peak has been selected as the primary outcome in the present RCT feasibility study. To ensure valid and high-quality methods, cycle ergometer testing and direct continuous measurement of respiratory gas exchange will be used to estimate the interventional effects on CRF. Further on, we will be able to detect important gradients in walking and exercise behaviour by examining the efficacy of patients wearing Omron pedometers. These pedometers are able to monitor and record step data on daily, weekly and monthly basis in accordance with individual goals for physical activity.
With respect to exercise interventions during cancer treatment, CRF has been one of the dominant outcomes, despite the fact that only 29% of RCTs demonstrated significant benefit on aerobic capacity, according to a systematic review and meta-analysis by Speck et al.25 The term ‘during cancer treatment’ represents a comprehensive range of distinct treatment modalities (eg, surgery, chemotherapy, radiotherapy, targeted antibodies and antihormones), that each, along with their respective side effects, may impact patient life experiences and ability to cope. Undergoing chemotherapy is commonly considered to be harmful to physiological functioning and capacity27 ,110 produces toxic side effects,6 ,13 ,111–113 impacts general well-being and causes psychological distress.20 ,114 ,115 Though a considerable amount of studies have been performed in the breast cancer population, few RCTs have been conducted during chemotherapy and with different primary outcomes (fatigue, weight gain, quality of life, bone density, physiological capacity and patient reported physical functioning).116–120 Exercise interventions during chemotherapy that consider patients with colon cancer represent a total gap in the field.24
The question of optimal timing for exercise instigation is relevant to discuss and it is still unclear how soon after diagnosis exercise should be promoted.24 ,40 This is particularly relevant in the case of patients with cancer who undergo invasive surgery often followed by chemotherapy. Furthermore, these patients’ physical habitués, comorbidity and symptom and side effects burden may influence their ability to participate in exercise interventions irrespective of motivational factors. This is even more pertinent among patients with breast and colon cancers, as adjuvant chemotherapy regimens, administered in the outpatient clinic, are standardised to incorporate a variety of antineoplastic agents, with specific individual toxicities. However, patient-professional time in the outpatient setting to support symptom management may be limited.
Identifying sedentary patients and measuring physical activity levels presents numerous challenges. Different self-report methods are applied across studies121 ,122 and may increase the risk of inaccurate or biased recall of physical activities and training intensities. The challenge is therefore to identify, recruit and motivate a sedentary population by using national criteria for physical inactivity, which remains a central element for discussion and validation in the current feasibility study.
In parallel, it is a constant challenge for cancer survivors to take initiative to remain active and adopt exercise as a behavioural practice in daily life following adjuvant chemotherapy.78 ,12,3 Results from the USA show that 35% of cancer survivors remain physically inactive 5 years after diagnosis.12,4 No such data are currently available in Danish populations.
The present feasibility study incorporates 45 sedentary patients identified by oncologists and clinical nurses during prescreening in the department of oncology. We hypothesise that the onset period of adjuvant chemotherapy can be ‘the open window of opportunity’ to identify and motivate sedentary patients with breast and colon cancers to initiate and sustain lifestyle changes of importance to their health.
This feasibility study will provide insight into short-term core clinical benefits (eg, symptom management, treatment adherence and completion) and individual barriers to exercise during adjuvant chemotherapy while simultaneously scoping long-term health and social benefits of two exercise interventions.
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