title: Testing mediator variables in a resistance training intervention for obese adults with type 2 diabetes.
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.
authors: Priority Research Centre in Physical Activity and Nutrition, University of Newcastle, Callaghan Campus, Newcastle, NSW 2308, Australia. david.lubans@newcastle.edu.au
authors: David R
authors: DR
authors: Lubans
authors: Ronald C
authors: RC
authors: Plotnikoff
authors: Mary
authors: M
authors: Jung
authors: Neil
authors: N
authors: Eves
authors: Ron
authors: R
authors: Sigal
mesh_terms: D000328:Adult; D000368:Aged; D003924:Diabetes Mellitus, Type 2 / Q000150:complications / Q000628:therapy*; D015444:Exercise / Q000523:psychology*; D005260:Female; D006699:Home Care Services; D006801:Humans; D008297:Male; D008875:Middle Aged; D053580:Muscle Strength; D009765:Obesity / Q000150:complications / Q000628:therapy*; D010349:Patient Compliance / Q000706:statistics & numerical data; D015397:Program Evaluation; D055070:Resistance Training / Q000379:methods*; D011795:Surveys and Questionnaires