Peak power and body mass as indices of bone loading in a healthy adult population

Objective: The purpose of this study was to examine whether a common, non-invasive, muscular fitness field test was a better predictor of bone strength compared to body mass. Methods: Hierarchical multiple regression analyses were used to determine the amount of variance that peak power explained for bone strength of the tibia compared to body mass. Peak power was estimated from maximal vertical jump height using Sayer’s equation. Peripheral quantitative computed tomography scans were used to assess bone strength measures. Results: Peak power (ꞵ=0.541, p&lt;0.001) contributed more to the unique variance in bone strength index for compression compared to body mass (ꞵ=-0.102, p=0.332). For polar strength strain index, the beta coefficient for body mass remained significant (ꞵ=0.257, p&lt;0.006), however, peak power’s contribution was similar (ꞵ=0.213, p= 0.051). Conclusion: Compared to body mass, peak power was a better predictor for trabecular bone strength but similar to body mass for cortical bone strength. These data provide additional support for the development of a vertical jump test as a simple, objective, valid and reliable measure to monitor bone strength among youth and adult populations.研究目的：本研究旨在探讨一项通用无创肌肉体能现场测试，是否较体质量能更好地预测骨强度。方法：采用分层多元回归分析，明确峰值功率（peak power）相较于体质量，对胫骨骨强度所能解释的变异量。峰值功率通过赛尔公式（Sayer’s equation）由最大垂直跳跃高度估算得出；采用外周定量计算机断层扫描（Peripheral quantitative computed tomography）评估骨强度相关指标。结果：相较于体质量（β=-0.102，p=0.332），峰值功率（β=0.541，p<0.001）对压缩骨强度指数的独特变异贡献度更高。对于极坐标强度应变指数，体质量的β系数仍具有统计学意义（β=0.257，p<0.006），但峰值功率的贡献度与之相近（β=0.213，p=0.051）。结论：与体质量相比，峰值功率对松质骨（trabecular bone）强度的预测效果更优，而对皮质骨（cortical bone）强度的预测效果与体质量相当。本研究数据进一步支持开发垂直跳跃测试，将其作为一种简便、客观、有效且可靠的评估手段，用于监测青年及成年人群的骨健康状况。