Active and passive contributions to joint kinetics during walking in older adults
Active and passive contributions to joint kinetics during walking in older adults
复制标题
DOI：
10.1016/j.jbiomech.2008.02.016
复制
发表时间：
2008-01-01
影响因子：
2.4
通讯作者：
Thelen, Darryl G.
中科院分区：
文献类型：
--
作者：
Silder, Amy;Heiderscheit, Bryan;Thelen, Darryl G.
本研究的目的是表征在健康的年轻人和老年人行走过程中关节动力学的主动和被动贡献，并评估等速踝关节力量是否与行走过程中踝关节功率输出相关。20名健康年轻人（18-35岁）和20名健康老年人（65-85岁）参与了本研究。我们测量了受试者下肢特定的被动弹性关节力矩-角度关系，并测试了30度/秒时的最大等速踝关节强度。被动力矩角关系被用来估计主动和被动关节力矩，功率和工作量在步行时，在80%，100%和120%的首选步行速度。老年人和年轻人之间的步行速度、步长或节奏没有显著差异。然而，老年人在所有步行速度下，髋关节产生的净正功明显更多，但踝关节产生的净正功较少。被动贡献髋关节和踝关节的工作没有显着差异组之间，推断老年人产生额外的髋关节工作积极。最大等速踝关节力量在老年人中明显较小，并且与首选和快速步行速度下的峰值正跖屈肌功率相关。这项研究的结果表明，与年龄相关的关节动力学的变化并没有出现被动髋关节僵硬的结果，但似乎反映在跖屈肌无力。(c)2008爱思唯尔有限公司保留所有权利。
The objectives of this study were to characterize the active and passive contributions to joint kinetics during walking in healthy young and older adults, and assess whether isokinetic ankle strength is associated with ankle power output during walking. Twenty healthy young (18-35 years) and 20 healthy older (65-85 years) adults participated in this study. We measured subject-specific passive-elastic joint moment-angle relationships in the lower extremity and tested maximum isokinetic ankle strength at 30deg/s. Passive moment angle relationships were used to estimate active and passive joint moment, power, and work quantities during walking at 80%, 100% and 120% of preferred walking speed. There were no significant differences in walking speed, step length, or cadence between the older and young adults. However, the older adults produced significantly more net positive work at the hip but less net positive work at the ankle at all walking speeds. Passive contributions to hip and ankle work did not significantly differ between groups, inferring that the older adults generated the additional hip work actively. Maximum isokinetic ankle strength was significantly less in the older adults, and correlated with peak positive plantar-flexor power at both the preferred and fast walking speeds. The results of this study suggest that age-related shifts in joint kinetics do not arise as a result of increased passive hip joint stiffness, but seem to be reflected in plantar-flexor weakness. (c) 2008 Elsevier Ltd. All rights reserved.