Sports Medicine Residency Program, Department of Orthopedics and Traumatology, Federal University of São Paulo, Brazil.
Department of Physiology, Federal University of São Paulo, Brazil.
Sci Prog. 2024 Jul-Sep;107(3):368504241261844. doi: 10.1177/00368504241261844.
Physical inactivity is considered an important risk factor for osteoporosis, however, some athletes performing extremely high training volumes can also develop bone mass loss. Moreover, the effect of total body mass or body surface area on bone mineral density remains controversial. Therefore, the aim of this study was to compare the absolute bone mineral density and bone mineral density adjusted to body surface area between amateur triathletes and nonactive women.
Forty-two healthy women (23 amateur triathletes and 19 nonactive individuals) were evaluated for body composition using a dual-energy X-ray absorptiometry system.
Compared to nonactive women, amateur triathletes exhibited lower body mass index (< 0.001), lower bone mineral density (< 0.001), and body surface area (< 0.001). However, bone mineral density adjusted by body surface area in the triathletes was higher than in the nonactive women (= 0.03).
These findings showed that amateur triathles presented lower absolute bone mineral density, but higher bone mineral density adjusted to body surface area. Future studies are recommended to identify if the higher bone mineral density adjusted to body surface area are associated with a lower bone fragility.
身体活动不足被认为是骨质疏松的一个重要危险因素，但一些进行极高训练量的运动员也可能会出现骨量流失。此外，身体总质量或体表面积对骨密度的影响仍存在争议。因此，本研究的目的是比较业余铁人三项运动员和非运动女性的绝对骨密度和体表面积校正的骨密度。
使用双能 X 射线吸收仪系统评估 42 名健康女性（23 名业余铁人三项运动员和 19 名非运动个体）的身体成分。
与非运动女性相比，业余铁人三项运动员的体重指数较低（<0.001）、骨密度较低（<0.001）和体表面积较小（<0.001）。然而，铁人三项运动员的体表面积校正骨密度高于非运动女性（=0.03）。
这些发现表明，业余铁人三项运动员的绝对骨密度较低，但体表面积校正的骨密度较高。建议进行未来的研究，以确定体表面积校正的骨密度较高是否与较低的骨脆性有关。
