Predictors of adherence and contamination in a randomized trial of exercise in colorectal cancer survivors

Psycho-oncology
K S CourneyaAdrian S Fairey

Abstract

The purpose of this study was to examine predictors of exercise adherence (i.e. exercise in the intervention group) and exercise contamination (i.e. exercise in the control group) in a randomized controlled trial of home-based exercise in colorectal cancer survivors. At baseline, 102 participants completed measures of the theory of planned behavior, personality, past exercise, exercise stage of change, physical fitness, and medical/demographics and then were randomly assigned in a 2:1 ratio to an exercise (n=69) or control (n=33) group. Exercise was monitored weekly for 16 weeks using self-reports by telephone. Ninety-three (91%) participants completed the trial. Adherence was 76% in the exercise group and contamination was 52% in the control group. Hierarchical stepwise regression analyses indicated that baseline exercise stage of change (beta=0.35; p=0.001), employment status (beta=-0.28; p=0.010), treatment protocol (beta=-0.26; p=0.018), and perceived behavioral control (beta=0.20; p=0.055) explained 39.6% of the variance in exercise adherence. Intentions (beta=0.36; p=0.049) and baseline exercise stage of change (beta=0.30; p=0.095) explained 29.9% of the variance in exercise contamination. These findings may have implicat...Continue Reading

Associated Clinical Trials

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Citations

Jun 16, 2007·Supportive Care in Cancer : Official Journal of the Multinational Association of Supportive Care in Cancer·Carolyn J PeddleKerry S Courneya
Jul 3, 2007·Supportive Care in Cancer : Official Journal of the Multinational Association of Supportive Care in Cancer·Laura Q RogersKrishna Rao
Jul 18, 2009·Supportive Care in Cancer : Official Journal of the Multinational Association of Supportive Care in Cancer·S Nicole Culos-ReedPeter Faris
Feb 25, 2011·Supportive Care in Cancer : Official Journal of the Multinational Association of Supportive Care in Cancer·Margaret L McNeelyKerry S Courneya
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