Sensitivity of joint moments to changes in walking speed and body-weight-support are interdependent and vary across joints.
Sensitivity of joint moments to changes in walking speed and body-weight-support are interdependent and vary across joints.
复制标题
DOI：
10.1016/j.jbiomech.2013.01.001
复制
发表时间：
2013-04-05
影响因子：
2.4
通讯作者：
Stanhope SJ
中科院分区：
文献类型：
--
作者：
Goldberg SR;Stanhope SJ
我们研究了体重支撑水平和步行速度的同时变化对踝关节、膝关节和髋关节平均峰值内关节力矩的影响。我们假设观察到的这些关节力矩的变化与体重支撑和步行速度近似呈线性关系，并且在关节间相似。运动学和动力学数据收集从8个未受损的成年受试者走在仪器跑步机上，同时穿着动态控制的开销支持安全带。受试者在四个体重支撑水平（体重的0%、20%、40%和60%）下以三种步行速度（0.4、0.6和0.8身高/秒，平均范围为0.7至1.4 m/s）行走。数据用于计算每种条件下受试者的平均峰值关节力矩。一般来说，受试者的平均峰值关节力矩随着步行速度的降低和体重支撑的增加而线性降低，但膝关节伸展力矩除外，其与步行速度呈二次曲线关系，而与体重支撑无显著变化。所有的关节力矩，膝关节伸展除外，行走速度和体重支持之间的显着的相互作用的影响，表明这些关节力矩的敏感性，这些变量的变化是相互依赖的。在大多数情况下，踝关节和髋关节伸展力矩对步行速度的敏感性最大。观察到踝关节力矩对体重支撑具有最大的敏感性。这一发现，改变步行速度和体重的支持水平的结果在非均匀的变化，在峰值时刻在关节，表明进一步的研究是必要的，以建立一套组合的速度和支持条件，产生运动模式支持正常的步态再训练。
We investigated the effect of simultaneous changes in body-weight-support level and walking speed on mean peak internal joint moments at the ankle, knee and hip. We hypothesized that observed changes in these joint moments would be approximately linear with both body-weight-support and walking speed and would be similar across joints. Kinematic and kinetic data were collected from 8 unimpaired adult subjects walking on an instrumented treadmill while wearing a dynamically controlled overhead support harness. Subjects walked with four levels of body-weight-support (0%, 20%, 40%, and 60% of bodyweight) at three walking speeds (0.4, 0.6, and 0.8 statures/s, ranging on average from 0.7 to 1.4 m/s). Data were used to calculate mean peak joint moments across subjects for each condition. In general, subjects’ mean peak joint moments decreased linearly with decreasing walking speed and with increasing body-weight-support, except the knee extension moment, which showed a quadratic relationship with walking speed and no significant change with body-weight-support. All joint moments, with the exception of knee extension, showed a significant interaction effect between walking speed and body-weight-support, indicating that the sensitivity of these joint moments to changes in these variables was interdependent. In most cases, the ankle and hip extension moments showed the largest sensitivity to walking speed. The ankle moment was observed to have the greatest sensitivity to body-weight-support. This finding, that altering walking speed and body-weight-support level results in non-uniform changes in peak moments across joints, suggests that further research is warranted to establish the set of combined speed and support conditions that produce motor patterns supportive of normal gait retraining.
登录
查看更多内容
影响因子：
2.4
作者：
Kepple, TM;Siegel, KL;Stanhope, SJ
通讯作者：
Stanhope, SJ
影响因子：
2.4
作者：
Liu, May Q.;Anderson, Frank C.;Schwartz, Michael H.;Delp, Scott L.
通讯作者：
Delp, Scott L.
DOI：
10.1109/86.895954
发表时间：
2000-12-01
期刊：
IEEE TRANSACTIONS ON REHABILITATION ENGINEERING
影响因子：
--
作者：
Gazzani, F;Fadda, A;Macellari, V
通讯作者：
Macellari, V
影响因子：
3.2
作者：
FINCH, L;BARBEAU, H;ARSENAULT, B
通讯作者：
ARSENAULT, B
影响因子：
3.2
作者：
Field-Fote, Edelle C.;Roach, Kathryn E.
通讯作者：
Roach, Kathryn E.