Why is walker-assisted gait metabolically expensive?
Why is walker-assisted gait metabolically expensive?
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DOI：
10.1016/j.gaitpost.2011.05.011
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发表时间：
2011-06-01
期刊：
影响因子：
2.4
通讯作者：
Kram, Rodger
中科院分区：
文献类型：
--
作者：
Priebe, Jonathon R.;Kram, Rodger
据报道，步行辅助步态的代谢成本比正常双足步行高出200%。然而，以前的研究比较了不同的步行速度。在这里，我们比较了10名年轻健康成年人在没有辅助的情况下行走以及使用2轮（2 W）、4轮（4 W）和4足（4F）步行者设备的代谢功率消耗和基本步幅时空参数，所有这些设备都以相同的速度（0.30 m/s）行走。我们还测量了在没有任何辅助设备的情况下以0.30 m/s的步速步态行走、以1.25 m/s的速度正常行走以及模仿4F步行者辅助步态期间使用的提升模式重复提升4F步行者的代谢功率需求。与之前的研究类似，我们发现，与无辅助的双足步行（1.25 m/s）相比，使用4F步行者以0.30 m/s的速度步行的单位距离成本高出217%。在0.30 m/s的相同速度下，使用4F步行者比使用4 W步行者和2 W步行者分别多消耗82%、74%和55%的能量。逐步步行的代谢成本加上提升自身的成本之和相当于使用4F步行者步行的成本。因此，我们推断，4F步行者辅助步态的高成本是由于三个因素：缓慢的步行速度，一步一步的步态模式和重复抬起的步行者。(C)2011爱思唯尔有限公司版权所有。
Walker-assisted gait is reported to be similar to 200% more metabolically expensive than normal bipedal walking. However, previous studies compared different walking speeds. Here, we compared the metabolic power consumption and basic stride temporal-spatial parameters for 10 young, healthy adults walking without assistance and using 2-wheeled (2W), 4-wheeled (4W) and 4-footed (4F) walker devices, all at the same speed, 0.30 m/s. We also measured the metabolic power demand for walking without any assistive device using a step-to gait at 0.30 m/s, walking normally at 1.25 m/s, and for repeated lifting of the 4F walker mimicking the lifting pattern used during 4F walker-assisted gait. Similar to previous studies, we found that the cost per distance walked was 217% greater with a 4F walker at 0.30 m/s compared to unassisted, bipedal walking at 1.25 m/s. Compared at the same speed, 0.30 m/s, using a 4F walker was still 82%, 74%, and 55% energetically more expensive than walking unassisted, with a 4W walker and a 2W walker respectively. The sum of the metabolic cost of step-to walking plus the cost of lifting itself was equivalent to the cost of walking with a 4F walker. Thus, we deduce that the high cost of 4F walker assisted gait is due to three factors: the slow walking speed, the step-to gait pattern and the repeated lifting of the walker. (C) 2011 Elsevier B.V. All rights reserved.