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Move More: translating an efficacious group dynamics physical activity intervention into effective clinical practice
Estabrooks PA, Smith-Ray RL, Almeida FA, Hill J, Gonzales M, Schreiner P, van den Berg R
International Journal of Sport and Exercise Psychology 2011;9(1):4-18
clinical trial
4/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: No; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

The purpose of this study was to describe the effectiveness of a practical group dynamics-based physical activity (PA) intervention and determine the mechanisms of PA change. Participants (n = 115) were randomly assigned to the three-month move more intervention or enhanced standard care control. Self-reported PA and proposed mediators were assessed at baseline, three and nine months. Participants from both conditions increased their PA during the initial three months, F[2,67] = 24.67, p < 0.01. A significant time by condition interaction, F[2,67] = 4.25, p < 0.05, demonstrated that participants in the group dynamics condition sustained or further increased PA at nine months while those in the enhanced standard care did not. Change in self-efficacy, outcome expectation-satisfaction, PA goals, and institutional support, significantly predicted increases in PA (p < 0.05) at three months, but not at nine months. These findings demonstrate the potential of adopting efficacious group dynamics principles from intensive PA interventions into a practical and effective clinical model.

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