UPPER EXTREMITY FUNCTION IN RUNNING .2. ANGULAR-MOMENTUM CONSIDERATIONS
UPPER EXTREMITY FUNCTION IN RUNNING .2. ANGULAR-MOMENTUM CONSIDERATIONS
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DOI：
10.1123/ijsb.3.3.242
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发表时间：
1987-08-01
期刊：
影响因子：
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通讯作者：
HINRICHS, RN
中科院分区：
文献类型：
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作者：
HINRICHS, RN
对10名男性休闲跑步者在跑步机上以3.8m/S、4.5m/S和5.4m/S的速度跑步时进行三维摄影拍摄，采用14段数学模型分析手臂对三个垂直轴通过身体质心时全身角动量的贡献。结果表明，当物体在所有三个坐标轴上具有不同量的角动量时，手臂只对垂直分量(赫兹)做出有意义的贡献。研究发现，在跑步周期中，手臂会交替产生正和负的Hz模式。这往往会抵消腿上相反的Hz型图案。研究发现，躯干是角动量平衡的积极参与者，上躯干与手臂一起来回旋转，较小程度上，下躯干与腿一起旋转。结果是，在整个跑步周期中，全身的Hz相对较小。上半身和下半身角动量之间的反比关系表明，手臂和上半身提供了大部分围绕z轴的角冲量，这是让腿在跑步中交替跨步所需的。
Ten male recreational runners were filmed using three-dimensional cinematography while running on a treadmill at 3.8 m/s, 4.5 m/s, and 5.4 m/s. A 14-segment mathematical model was used to examine the contributions of the arms to the total-body angular momentum about three orthogonal axes passing through the body center of mass. The results showed that while the body possessed varying amounts of angular momentum about all three coordinate axes, the arms made a meaningful contribution to only the vertical component (Hz). The arms were found to generate an alternating positive and negative Hzpattern during the running cycle. This tended to cancel out an opposite Hzpattern of the legs. The trunk was found to be an active participant in this balance of angular momentum, the upper trunk rotating back and forth with the arms and, to a lesser extent, the lower trunk with the legs. The result was a relatively small total-body Hzthroughout the running cycle. The inverse relationship between upper- and lower-body angular momentum suggests that the arms and upper trunk provide the majority of the angular impulse about the z axis needed to put the legs through their alternating strides in running.