Pimentel Richard E, Pieper Noah L, Clark William H, Franz Jason R
Joint Department of Biomedical Engineering, UNC Chapel Hill and NC State University, Chapel Hill, NC, USA.
Comput Methods Biomech Biomed Engin. 2021 Nov;24(14):1552-1565. doi: 10.1080/10255842.2021.1900134. Epub 2021 Mar 22.
We pose that an age-related increase in the metabolic cost of walking arises in part from a redistribution of joint power where muscles spanning the hip compensate for insufficient ankle push-off and smaller peak propulsive forces (F). Young adults elicit a similar redistribution when walking with smaller F via biofeedback. We used targeted F biofeedback and musculoskeletal models to estimate the metabolic costs of operating lower limb muscles in young adults walking across a range of F. Our simulations support the theory of distal-to-proximal redistribution of joint power as a determinant of increased metabolic cost in older adults during walking.
我们认为，与年龄相关的步行代谢成本增加部分源于关节功率的重新分配，即跨越髋关节的肌肉会补偿踝关节蹬离不足以及较小的峰值推进力（F）。当年轻人通过生物反馈以较小的F行走时，也会出现类似的重新分配。我们使用有针对性的F生物反馈和肌肉骨骼模型来估计年轻人在一系列F值下行走时下肢肌肉运作的代谢成本。我们的模拟结果支持了关节功率从远端到近端重新分配的理论，该理论是老年人行走时代谢成本增加的一个决定因素。
