2017 Volume 70 Issue 1 Pages 9-15
The present study was conducted to compare bone mineral density (BMD) among long distance runners with sprinters, and to examine factors related to BMD at different bone sites among female high school track and field athletes. Thirty-seven adolescent female long distance runners (LDRs) and sprinters (SPRs) (16.1±0.8 yr old, LDR ［＞800 m］ n＝16, SPR ［100‐400 m］ n＝21) participated. We measured BMD and fat-free mass (FFM) by DXA. In addition, we assessed nutrient intake, physical activity, prior history of stress fracture and menstrual state using a questionnaire. BMD and FFM were significantly higher in SPRs than in LDRs. Multiple regression analysis showed that FFM was a significant covariate of BMD at all sites except for the spine. Seafood intake was a significant covariate of BMD in the arms, pelvis and total bone less head (TBLH) . BMI was a significant covariate of BMD in the pelvis. Differences in BMD between LDRs and SPRs were strongly influenced by FFM, and seafood intake was shown to be a factor contributing significantly to BMD among female high school track and field athletes.
