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Medicine & Science in Sports & Exercise:
doi: 10.1249/01.mss.0000222846.27380.61
APPLIED SCIENCES: Physical Fitness and Performance

Associations of Body Size and Composition with Physical Activity in Adolescent Girls

LOHMAN, TIMOTHY G.1; RING, KIMBERLY2; SCHMITZ, KATHRYN H.3; TREUTH, MARGARITA S.4; LOFTIN, MARK5; YANG, SONG6; SOTHERN, MELINDA7; GOING, SCOTT1

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Abstract

Purpose: To examine whether components of body composition (size, fat mass, and fat-free mass) were related to physical activity.

Methods: A random sample of 60 eligible sixth grade girls at each of 36 schools (six schools per region and six regions in total sample); complete measurements on 1553 girls. Physical activity was assessed over 6 d in each girl using an accelerometer, and body composition was assessed using a multiple regression equation using body mass index and triceps skinfold. Minutes of moderate-to-vigorous and vigorous physical activity were estimated from accelerometer counts per 30 s above threshold values determined from a previous study.

Results: Significant inverse relationships were found for all measures of body size and composition and all physical activity indices. The combination of fat and fat-free mass expressed as a weight and as an index (divided by height squared) along with race, SES, site, and school were most highly associated with physical activity in multiple regression analysis, accounting for 14-15% of the variance in physical activity. Fat mass was more closely related to moderate-to-vigorous physical activity (MVPA) and vigorous physical activity (VPA) than fat-free mass with higher standardized regression coefficients.

Conclusion: We conclude that both fat mass or fat mass index as well as fat-free mass or fat-free mass index make independent contributions in association with physical activity levels. These indices are recommended for future studies.

©2006The American College of Sports Medicine

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