骨加速和地面反应力之间的关系,在用载荷车行走时
Caleb D Johnson1, Lauren K Sara2, Molly M Bradach3
1Military Performance Division, United States Army Institute of Environmental Medicine, Natick, MA 01760, USA.
Journal of biomechanics
|July 5, 2023
概括
装载士兵改变了冲击力和部加速之间的关系. 这些生物力学变化可能会影响负载行走时的受伤风险.
科学领域:
- 生物力学 生物力学
- 人类运动科学 人类运动科学
- 肌肉骨健康 肌肉骨健康
背景情况:
- 尖加速 (TAs) 与跑步中的垂直地面反应力 (GRFs) 相对应,这是肌肉骨损伤的一个因素.
- 有限的研究存在于行走期间的GRF-TA关系,特别是在增加负载时,这是一个常见的军事活动.
研究的目的:
- 为了研究地面反应力 (GRFs) 与美国陆军训练员携带重物行走时的脚加速 (TAs) 之间的关联.
- 为了将这些关系与未加载的行走和跑步报告的关系进行比较.
主要方法:
- 649名美国陆军学员在带有18.1公斤包装的仪器跑步机上行走.
- 一个惯性测量单元记录了距离前中的 accelerations (TAs).
- 线性回归分析了峰值TA和GRF负载率/峰值力之间的关系.
主要成果:
- 最强的相关性是在垂直负载率和峰值垂直TAs (R = 0.430.50) 之间.
- 这些关系比以前报告的无负荷行走和跑步 (R > 0.7) 的关系更弱.
- 其他GRF-TA关系是微不足道的小 (R = 0.060.27).
结论:
- 负载行走期间较弱的GRF-TA关系可能源于方法变化或改变的步态机制,例如延长双肢支阶段.
- 了解这些生物力学反应对于减轻执行负载游行的军事人员受伤风险至关重要.
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