Decreased external skeletal robustness due to reduced physical activity?
Article first published online: 20 APR 2013
Copyright © 2013 Wiley Periodicals, Inc.
American Journal of Human Biology
Volume 25, Issue 3, pages 404–410, May/June 2013
How to Cite
Rietsch, K., Eccard, J. A. and Scheffler, C. (2013), Decreased external skeletal robustness due to reduced physical activity?. Am. J. Hum. Biol., 25: 404–410. doi: 10.1002/ajhb.22389
- Issue published online: 20 APR 2013
- Article first published online: 20 APR 2013
- Manuscript Accepted: 22 FEB 2013
- Manuscript Revised: 20 FEB 2013
- Manuscript Received: 17 DEC 2012
Childhood obesity is a global problem, e.g., due to physical inactivity. External skeletal robustness (Frame-Index) has decreased in German schoolchildren. An association between Frame-Index and physical activity was assumed. Further often body mass index (BMI) is analyzed without reference to bone structure. Therefore, we analyze relationships between Frame-Index, BMI, % body fat, and physical activity.
In a cross-sectional study, 691 German children aged 6–10 years were investigated. BMI, % body fat, Frame-Index, total steps p.w., sports club rate p.w., training time p.d., and TV-time p.d. were determined.
Total steps (P < 0.001), BMI (P < 0.001), and % body fat (P = 0.024) are positively linked to Frame-Index. Total steps (P < 0.001), sports club rate (P = 0.001), and training time (P < 0.001) are negatively associated with % body fat. Total steps (P = 0.017) are negatively linked to BMI. TV-time is positively related to BMI (P < 0.001) and % body fat (P < 0.001). % Body fat is affected by age (P < 0.001), sex (P = 0.028), and total steps (P = 0.002). BMI is influenced by age (P < 0.001), and Frame-Index by sex (P < 0.001) and total steps (P = 0.029). Principal component analysis indicates an association between BMI and TV-time and Frame-Index and total steps.
We demonstrate an association between external skeletal robustness and physical activity, which is not captured by in BMI measurements. Children should be physically active in order to maintain skeletal robustness. Am. J. Hum. Biol. 25:404–410, 2013. © 2013 Wiley Periodicals, Inc.