NEVILL, A. M., M. BURROWS, R. L. HOLDER, S. BIRD, and D. SIMPSON. Does Lower-Body BMD Develop at the Expense of Upper-Body BMD in Female Runners? Med. Sci. Sports Exerc., Vol. 35, No. 10, pp. 1733–1739, 2003.
Evidence suggests that exercise plays an important role in stimulating site-specific bone mineral density (BMD). However, what is less well understood is how these benefits dissipate throughout the body. Hence, the purpose of the present study was to compare the levels of, and the correlation between, BMD recorded at 10 sites in female endurance runners, and to investigate possible determinants responsible for any inter-site differences observed.
Repeated measures ANOVA was used to compare the BMD between sites and factor analysis was used to describe the pattern of intersite correlations. Allometric ANCOVA was used to identify the primary determinants of bone mass and how these varied between sites.
The ANOVA and factor analysis identified systematic differences in BMD between sites, with the greatest BMD being observed in the lower-body sites, in particular the legs. An investigation into the possible mechanisms responsible for these differences revealed “distances run” (km·wk−1) as a positive, and “years of training” as a negative determinant of bone mass (P < 0.001). However, the effect of a number of determinants varied between sites (P < 0.05). Specifically, the ANCOVA identified that running further distances resulted in higher bone mass in the arms and legs. In contrast, training for additional years appeared to result in lower bone mass in the arms and lumber spine. Calcium intake was also found to be positively associated with bone mass in the legs but negatively associated at all other sites.
A combination of running exercise and calcium intake would appear to stimulate the bone mass of women endurance runners at lower-body sites but at the expense of bone mass at upper-body sites.
1University of Wolverhampton, School of Sport, Performing Arts, and Leisure, UNITED KINGDOM;
2University of Exeter, School of Sport and Health Science, Exeter, UNITED KINGDOM;
3University of Birmingham, Edgbaston, Birmingham, UNITED KINGDOM;
4Centre for Population Health, Sunshine Hospital and Melbourne University, Victoria, AUSTRALIA; and
5Kent and Canterbury Hospital, Canterbury, UNITED KINGDOM
Address for correspondence: Professor Alan M. Nevill, University of Wolverhampton, School of Sport, Performing Arts and Leisure, Walsall Campus, Gorway Road, Walsall, WS1 3BD, United Kingdom; E-mail: email@example.com.
Submitted for publication February 2003.
Accepted for publication June 2003.