Objectives: Program method, program deliverer
and participant preference may be important factors in increasing physical
activity adherence and program effectiveness. To investigate this, we compared
two physical activity interventions in middle-aged adults. Methods: Using a pragmatic
quasi-experimental design, sedentary community dwelling 50 - 65 year olds (n = 2105) were recruited to a non-randomized 6-month
community group exercise program (n = 93) or
a physiotherapist-led home-based physical activity program (n = 65). The primary outcome was physical activity adherence
derived from exercise diaries. Secondary outcomes included the Active Australia
Survey, aerobic capacity (step- test), quality of life (SF-12v2), blood pressure,
waist circumference, waist-to-hip ratio (WHR) and body mass index. Results: Home-based participants were more likely to be
younger, working full-time and not in a relationship (p < 0.05). Thirty-three
percent of the group participants attended ≥ 70% of group exercise sessions.
Ninety percent of home-based participants received ≥ 4 of the planned 6
telephone support calls. Intention-to-treat analysis found adherence to the
physical activity sessions prescribed was the same for both interventions (26% ±
28% vs. 28% ± 35%). Both interventions significantly increased the number of
participants achieving self-reported “sufficient” physical activity (p ≤ 0.001) and significantly decreased
waist circumference (
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