The Effect of Home-Based Resistance Exercise in Overweight and Obese Adults.
PURPOSE: The purpose of this study was to examine the changes in muscular strength, physical function and health-related quality of life (HRQOL) with the addition of resistance training to a 12 week behavioral weight loss intervention in overweight and obese adults. METHODS: Forty-eight overweight adults (body mass index = 33.3ï¿½3.5 kg/m2) participated in this study. Thirty-eight subjects completed the 12 week behavioral weight loss intervention consisting of weekly behavioral counseling and weekly exercise sessions. Twenty-two subjects completed the 12 week standard behavioral weight loss intervention (SBWI) and sixteen subjects completed the 12 week home-based resistance exercise program (HBRE). The following measurements were performed at baseline and again at week 12: body weight, body mass index, body composition, muscular strength (1 RM chest press and 1 RM leg extension), physical function and HRQOL. RESULTS: A repeated measures ANOVA showed that there were significant decreases from baseline to week 12 for body weight, body mass index, lean body mass, and percent body fat. Measures of physical function showed improvement in step-up time, walk test time, chair rise time, and single leg balance time. There was a significant reduction in absolute upper body muscular strength, with no significant change in absolute lower body muscular strength. There were significant improvements is subscales of HRQOL for role physical, vitality, and general health (p<0.05), with a trend towards improvement in physical functioning (p=0.07). There were no significant differences in the pattern of change in any of the outcome measures between SBWI and HBRE. However, compliance to prescribed resistance exercise was approximately 40% of prescribed exercise days for HBRE. CONCLUSION: Overall, this investigation produced positive changes from baseline to week 12 in the outcome variables of weight, body composition, physical function, and HRQOL. Resistance exercise did not further improve these outcomes compared to what was achieved with a non-resistance exercise behavioral weight loss intervention. This may have been a result of less than optimal compliance to the resistance exercise training aspect of the intervention in HBRE. These results imply that the addition of resistance training to a standard behavioral weight loss program offers no increased benefit in the variables of interest, possibly resulting from low compliance, and future studies should examine strategies to improve the compliance to resistance exercise in overweight adults undertaking a behavioral weight loss intervention.
Advisor:Kristie L. Abt, Ph.D; Andrea Locke, PT; John M. Jakicic, Ph.D; Amy Otto, Ph.D, RD, LDD
School:University of Pittsburgh
School Location:USA - Pennsylvania
Source Type:Master's Thesis
Keywords:health physical and recreation education
Date of Publication:09/29/2008