Mechanical energy expenditures and movement efficiency in full body reaching movements.
Mechanical energy expenditures and movement efficiency in full body reaching movements.
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DOI：
10.1123/jab.26.1.32
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发表时间：
2010-02
影响因子：
1.4
通讯作者：
D. Sha;C. France;James S. Thomas
中科院分区：
文献类型：
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作者：
D. Sha;C. France;James S. Thomas
研究了15名健康受试者（男7名，女8名，年龄22.9 +/- 1.79岁）的靶位、靶速和利手性对全身到达运动的平均总机械能和运动效率的影响。平均总机械能分别以关节功率、势能和动能积分的时间平均值来测量。运动效率计算为总动能与总关节功率和势能之比。结果表明，速度和目标位置对总机械能和运动效率有显著影响，而伸手只影响动能。从我们的研究结果中我们得出结论：(1)整个身体到达的效率取决于在任务过程中身体质心的高度是否升高或降低；(2)效率随着运动速度的提高而提高，部分原因是势能的变化更大；(3)中枢神经系统似乎没有将运动效率作为全身伸展的主要规划变量。它可能取决于其他因素或约束的组合。
The effect of target location, speed, and handedness on the average total mechanical energy and movement efficiency is studied in 15 healthy subjects (7 males and 8 females with age 22.9 +/- 1.79 years old) performing full body reaching movements. The average total mechanical energy is measured as the time average of integration of joint power, potential energy, and kinetic energy respectively. Movement efficiency is calculated as the ratio of total kinetic energy to the total joint power and potential energy. Results show that speed and target location have significant effects on total mechanical energy and movement efficiency, but reaching hand only effects kinetic energy. From our findings we conclude that (1) efficiency in whole body reaching is dependent on whether the height of the body center of mass is raised or lowered during the task; (2) efficiency is increased as movement speed is increased, in part because of greater changes in potential energy; and (3) the CNS does not appear to use movement efficiency as a primary planning variable in full body reaching. It may be dependent on a combination of other factors or constraints.