Determinants of Bone Outcomes in Adolescent Athletes at Baseline: The PRO-BONE Study.


Purpose: The determinants of areal bone mineral density (aBMD) and hip geometry estimates in adolescent athletes are poorly understood. This study aimed to identify the determinants of aBMD and hip geometry estimates in adolescent male athletes.

Methods: One hundred twenty one males (13.1+/-0.1 years) were measured: 41 swimmers, 37 footballers, 29 cyclists and 14 controls. Dual energy X-ray absorptiometry (DXA) measured aBMD at lumbar spine, femoral neck (FN) and total body. Hip structural analysis evaluated hip geometry estimates at the FN. Multiple linear regression examined the contribution of the sports practised, stature, lean and fat mass, serum calcium and vitamin D, moderate to vigorous physical activity (MVPA), vertical jump and cardiorespiratory fitness (CRF) with aBMD and hip geometry estimates.

Results: Region specific lean mass was the strongest positive predictor of aBMD ([beta] = 0.614 - 0.931) and football participation was the next strongest predictor ([beta] = 0.304 - 0.579). Stature ([beta] = 0.235 - 0.380), fat mass ([beta] = 0.189), serum calcium ([beta] = 0.103), serum vitamin D ([beta] = 0.104 - 0.139) and vertical jump ([beta] = 0.146 - 0.203) were associated with aBMD across various specific sites. All hip geometry estimates were associated with lean mass ([beta] = 0.370 - 0.568) and stature ([beta] = 0.338 - 0.430). Football participation was associated with hip cross-sectional area ([beta] = 0.322) and MVPA ([beta] = 0.140 - 0.142). CRF ([beta] = 0.183 - 0.207) was associated with section modulus and cross-sectional moment of inertia.

Conclusions: Region specific lean mass is the strongest determinant of aBMD and hip geometry estimates in adolescent male athletes. Football participation and stature were important determinants for aBMD and hip geometry estimates while the contribution of the other predictors was site specific.

(C) 2017 American College of Sports Medicine 


Autor / Fonte:Dimitris Vlachopoulos, Esther Ubago-Guisado, Alan R Barker, more. Medicine and Science in Sports and Exercise 2017 February 4