The influence of physical activity on lean mass accrual during adolescence: A longitudinal analysis

Baxter-Jones, A.D.G., Eisenmann, J.C., Mirwald, R.L., Faulkner, R.A. and Bailey, D.A. (2008) The influence of physical activity on lean mass accrual during adolescence: A longitudinal analysis. Journal of Applied Physiology, 105 2: 734-741. doi:10.1152/japplphysiol.00869.2007


Author Baxter-Jones, A.D.G.
Eisenmann, J.C.
Mirwald, R.L.
Faulkner, R.A.
Bailey, D.A.
Title The influence of physical activity on lean mass accrual during adolescence: A longitudinal analysis
Journal name Journal of Applied Physiology   Check publisher's open access policy
ISSN 8750-7587
Publication date 2008-08-01
Sub-type Article (original research)
DOI 10.1152/japplphysiol.00869.2007
Open Access Status
Volume 105
Issue 2
Start page 734
End page 741
Total pages 8
Editor J.A. Dempsey
Place of publication Bethesda, MD
Publisher American Physiological Society
Language eng
Subject C1
920116 Skeletal System and Disorders (incl. Arthritis)
920501 Child Health
110314 Orthopaedics
Abstract During childhood, physical activity is likely the most important modifiable factor for the development of lean mass. However, the effects of normal growth and maturation must be controlled. To distinguish effects of physical activity from normal growth, longitudinal data are required. One hundred nine boys and one hundred thirteen girls, participating in the Saskatchewan Pediatric Bone Mineral Accrual Study, were repeatedly assessed for 6 yr. Age at entry was 8–15 yr. Stature, body mass, and physical activity were assessed biannually. Body composition was assessed annually by dual-energy X-ray absorptiometry. Physical activity was determined using the physical activity questionnaires for children and adolescence. Biological age was defined as years from age of peak height velocity. Data were analyzed using multilevel random-effects models. In boys, it was found that physical activity had a significant time-dependent effect on lean mass accrual of the total body (484.7 ± 157.1 g), arms (69.6 ± 27.2 g), legs (197.7 ± 60.5 g), and trunk (249.1 ± 91.4 g) (P < 0.05). Although the physical activity effects were similar in the girls (total body: 306.9 ± 96.6 g, arms: 31.4 ± 15.5 g, legs: 162.9 ± 40.0 g, and trunk: 119.6 ± 58.2 g; P < 0.05), boys for the same level of activity accrued, depending on the site, between 21 and 120% more absolute lean mass (g). In conclusion, habitual physical activity had a significant independent influence on the growth of lean body mass during adolescence, once biological maturity and stature were controlled.
Keyword Growth And Development
Exercise
longitudinal studies
Q-Index Code C1
Q-Index Status Confirmed Code

 
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Created: Tue, 07 Apr 2009, 23:02:00 EST by Deborah Noon on behalf of School of Human Movement and Nutrition Sciences