OBJECTIVES: Physical activity is important for weight management. However, it remains unclear what type of physical activity prescription/programme is optimal for increasing physical activity during a standard behavioural weight loss intervention. This study examined changes in physical activity after a 12-week supervised programme prescribed in minutes per week (SUP-PA), an unsupervised programme prescribed in minutes per week (UNSUP-PA) and an unsupervised programme prescribed in steps per day (STEP). METHODS: Fifty-two adults who were overweight or obese (age 43.5 +/- 10.1 years, BMI 31.5 +/- 3.5 kg/m2) were randomized to STEP (n = 18), UNSUP-PA (n = 17) and SUP-PA (n = 17). Subjects attended weekly in-person group intervention sessions and were prescribed a calorie-restricted diet (1,200 to 1,800 kcals/day) combined with increased physical activity (150 min/week or 10,000 steps/day-1 with 2,500 brisk steps/day). RESULTS: All three groups significantly increased moderate-to-vigorous physical activity (STEP: 80.6 +/- 218.5 min/week, UNSUP-PA: 112.9 +/- 180.4 min/week and SUP-PA: 151.1 +/- 174.0 min/week, p < 0.001) with no differences between groups (p = 0.94) or group by time interaction (p = 0.81). In addition, there were no significant differences in weight loss between the groups (p = 0.81). CONCLUSIONS: In this short-term study, all three physical activity programmes increased physical activity and elicited modest weight loss when combined with a standard behavioural weight loss intervention.

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