Testing mediator variables in a physical activity intervention for聽women with type 2 diabetes

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• 作者：Ronald C. Plotnikoff ; David R. Lubans ; Chris M. Penfold ; Kerry S. Courneya
• 关键词：Intervention ; Mediation ; Physical activity ; Type 2 diabetes ; Adults
• 刊名：Psychology of Sport and Exercise
• 出版年：January, 2014
• 年：2014
• 卷：15
• 期：1
• 页码：1-8
• 全文大小：304 K

文摘

Objectives

A limited understanding of the mechanisms of behavior change has hindered the development of more effective interventions. The aim of this study was to identify potential mediators of objectively measured physical activity (PA) behavior change in women with type 2 diabetes (T2DM).

Design

Mediation test of a randomized controlled trial.

Method

Women with T2DM (n聽=聽93) from the control group (standard PA materials, n聽=聽44) and the full intervention group (control聽+聽stage-matched printed material and telephone counseling, n聽=聽49) of a larger PA intervention trial were included. PA outcomes were minutes of MET weighted moderate and vigorous PA/week (self-report) and steps/3-days (objective) recorded at baseline and 12-months. Social-cognitive constructs were measured and tested in a mediating variable framework.

Results

Perceived behavioral control and barrier self-efficacy mediated intervention effects on objective PA (proportion of intervention effect mediated聽=聽18% and 24% respectively). Intention was a mediator of objective PA (23%).

Conclusion

Perceived behavior control, barrier self-efficacy, and intention are effective mechanisms of PA behavior change in women with T2DM.