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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
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BODY COMPOSITION, SPORT NUTRITION AND SUPPLEMENTATION (ergogenics)
Yu C. C. W. 1, Sung R. Y. T. 1, Hau K. T. 2, Lam P. K. W. 3, Nelson E. A. S. 1, So R. C. H. 4
1 Department of Pediatrics The Chinese University of Hong Kong Shatin, NT, Hong Kong, China
2 Department of Educational Psychology The Chinese University of Hong Kong Shatin, NT, Hong Kong, China
3 Center for Clinical Trials and Epidemiological Research The Chinese University of Hong Kong Shatin, NT, Hong Kong, China
4 Hong Kong Sports Institute Shatin, NT, Hong Kong, China
Aim. The aim of this study was to examine the effects of a 6-week diet and exercise program, with emphasis on strength training, on the physical self-concept, body composition, and physical fitness of young overweight and obese children.
Methods. Eighty-two overweight and obese children aged 8-11 years were randomized into a diet-only or a diet-and-strength training group. Self-concept, body composition and physical fitness were measured before and after the 6-week study period using the Physical Self Description Questionnaires (PSDQ), dual-energy X-ray absorptiometry (DXA), and standard fitness tests. Dietary intake was assessed with a food frequency questionnaire. Total daily energy intake was significantly reduced in both groups with a trend of more reduction in the diet-only group.
Results. Both groups developed greater confidence in strength. Those in the diet-and-strength training group also improved their endurance self-concept. Body Mass Index (BMI) decreased significantly in both groups. Lean mass increased significantly in both groups but significantly more in the diet-and-strength training group (+0.8 kg vs +0.3 kg, P<0.05). Handgrip, shuttle run, sit-up, and push-up were significantly improved in both groups, to a significantly greater extent in the diet-and-strength training group.
Conclusion. These findings confirm the 6-week program of either diet-only or diet-and-strength training improved overweight/obese children’s self-perception of muscular strength and body composition. With the diet-and-strength training program, self-concept in endurance also improved and the gain in lean body mass was more than double that of the diet only group.