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BMJ Open 3:e003261 doi:10.1136/bmjopen-2013-003261
  • Public health
    • Research

Multicomponent intervention to reduce daily sedentary time: a randomised controlled trial

  1. Kayla Cangelosi3
  1. 1Department of Health and Human Physiology, University of Iowa, Iowa City, Iowa, USA
  2. 2School of Physical and Health Education, Nipissing University, North Bay, Ontario, Canada
  3. 3Department of Kinesiology, East Carolina University, Greenville, North Carolina, USA
  1. Correspondence to Dr Lucas J Carr; Lucas-Carr{at}uiowa.edu
  • Received 20 May 2013
  • Revised 12 August 2013
  • Accepted 29 August 2013
  • Published 18 October 2013

Abstract

Objectives To test the efficacy of a multicomponent technology intervention for reducing daily sedentary time and improving cardiometabolic disease risk among sedentary, overweight university employees.

Design Blinded, randomised controlled trial.

Setting A large south-eastern university in the USA.

Participants 49 middle-aged, primarily female, sedentary and overweight adults working in sedentary jobs enrolled in the study. A total of 40 participants completed the study.

Interventions Participants were randomised to either: (1) an intervention group (N=23; 47.6+9.9 years; 94.1% female; 33.2+4.5 kg/m2); (2) or wait-list control group (N=17; 42.6+8.9 years; 86.9% female; 31.7+4.9 kg/m2). The intervention group received a theory-based, internet-delivered programme, a portable pedal machine at work and a pedometer for 12 weeks. The wait-list control group maintained their behaviours for 12 weeks.

Outcome measures Primary (sedentary and physical activity behaviour measured objectively through StepWatch) and secondary (heart rate, blood pressure, height, weight, waist circumference, per cent body fat, cardiorespiratory fitness, fasting lipids) outcomes were measured at baseline and postintervention (12 weeks). Exploratory outcomes including intervention compliance and process evaluation measures were also assessed postintervention.

Results Compared to controls, the intervention group reduced daily sedentary time (mean change (95%CI): −58.7 min/day (−118.4 to 0.99; p<0.01)) after adjusting for baseline values and monitor wear time. Intervention participants logged on to the website 71.3% of all intervention days, used the pedal machine 37.7% of all working intervention days and pedalled an average of 31.1 min/day.

Conclusions These findings suggest that the intervention was engaging and resulted in reductions in daily sedentary time among full-time sedentary employees. These findings hold public health significance due to the growing number of sedentary jobs and the potential of these technologies in large-scale worksite programmes.

Trial Registration ClinicalTrials.gov #NCT01371084.

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 3.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/3.0/

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