Testing mediator variables in a resistance training intervention for obese adults with type 2 diabetes |
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Authors: | Lubans David R Plotnikoff Ronald C Jung Mary Eves Neil Sigal Ron |
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Institution: | a Priority Research Centre in Physical Activity and Nutrition , University of Newcastle , Callaghan Campus , Newcastle , NSW 2308 , Australia. |
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Abstract: | A poor understanding of behaviour change mechanisms has hindered the development of effective physical activity interventions. The aim of this study was to identify potential mediators of change in a home-based resistance training (RT) program for obese individuals with type 2 diabetes. Obese individuals with type 2 diabetes (N?=?48) were randomly allocated to either an RT intervention (n?=?27) or a control group (n?=?21) for the 16-week study period. The study sample included 16 men and 32 women and the mean age of participants was 54.4 (±11.7) years. Participants in the RT group received a multi-gym and dumbbells and home supervision from a certified personal trainer. RT behaviour was measured using a modified Godin Leisure Time Questionnaire. Social-cognitive constructs were measured and tested in a mediating variable framework using a product-of-coefficients test. The intervention had a significant effect on RT behaviour (p?0.001) and muscular strength (p?0.001). The intervention had a significant effect on RT planning strategies (p?0.01), which mediated the effect of the intervention on RT behaviour. The home-based RT program successfully targeted participants' RT planning strategies which contributed to their exercise adherence. |
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