Changes in kinematics, metabolic cost and external work during walking with a forward assistive force.
Changes in kinematics, metabolic cost and external work during walking with a forward assistive force.
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使用向前辅助力行走期间运动学、代谢成本和外部工作的变化。
DOI：
10.1123/jab.29.4.481
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发表时间：
2013
影响因子：
1.4
通讯作者：
M. Abel
中科院分区：
文献类型：
--
作者：
Christopher A. Zirker;B. Bennett;M. Abel
我们研究了在腰部施加向前水平力如何改变步态的代谢成本、运动学和外功。水平辅助力的4%，8%和12%的受试者的体重，通过我们的测试设备，而受试者走在舒适的步行速度在水平跑步机上。运动和代谢参数分别采用运动捕捉和运动肺活量测定法对一组10名健康男性受试者进行了测量。运动学和代谢参数的变化进行了量化，发现类似于走下坡在不同的等级。8%的水平辅助力导致代谢成本的最大降低。恢复因子、外部功和质心（COM）运动的变化与代谢率的变化无关，因此不会导致观察到的成本降低。辅助力可以通过提供推进力以及在COM在站立腿上枢转时升高COM来执行外部功。辅助力可以通过减少推进所需的同心功同时增加制动的偏心功来降低代谢成本。这些研究结果的影响，协助部队建议新的流动性艾滋病的个人步态障碍和运动员的训练策略。
We examined how the application of a forward horizontal force applied at the waist alters the metabolic cost, kinematics, and external work of gait. Horizontal assist forces of 4%, 8% and 12% of a subject's body weight were applied via our testing apparatus while subjects walked at comfortable walking speed on a level treadmill. Kinematic and metabolic parameters were measured using motion capture and ergospirometry respectively on a group of 10 healthy male subjects. Changes in kinematic and metabolic parameters were quantified and found similar to walking downhill at varying grades. A horizontal assist force of 8% resulted in the greatest reduction of metabolic cost. Changes in recovery factor, external work, and center of mass (COM) movement did not correlate with changes in metabolic rate and therefore were not driving the observed reductions in cost. The assist force may have performed external work by providing propulsion as well as raising the COM as it pivots over the stance leg. Assist forces may decrease metabolic cost by reducing the concentric work required for propulsion while increasing the eccentric work of braking. These findings on the effects of assist forces suggest novel mobility aids for individuals with gait disorders and training strategies for athletes.
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DOI：
--
发表时间：
1988-09
期刊：
The Journal of experimental biology
影响因子：
--
作者：
N. Heglund;C. Taylor
通讯作者：
N. Heglund;C. Taylor
影响因子：
2.4
作者：
Neptune, RR;Zajac, FE;Kautz, SA
通讯作者：
Kautz, SA
DOI：
--
发表时间：
2002-12
期刊：
The Journal of experimental biology
影响因子：
--
作者：
J. Donelan;R. Kram;A. Kuo
通讯作者：
J. Donelan;R. Kram;A. Kuo
影响因子：
3.3
作者：
Grabowski, A;Farley, CT;Kram, R
通讯作者：
Kram, R
影响因子：
3.3
作者：
Gottschall, JS;Kram, R
通讯作者：
Kram, R