A comparison of the mechanical effect of arm swing and countermovement on the lower extremities in vertical jumping
A comparison of the mechanical effect of arm swing and countermovement on the lower extremities in vertical jumping
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DOI：
10.1016/j.humov.2008.04.001
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发表时间：
2008-08-01
影响因子：
2.1
通讯作者：
Fukashiro, Senshi
中科院分区：
文献类型：
--
作者：
Hara, Mikiko;Shibayama, Akira;Fukashiro, Senshi
本研究的目的是量化和比较手臂摆动和反向运动如何影响下肢扭矩和工作在垂直跳跃，并深入了解的机制，使手臂摆动和反向运动，以增加跳跃高度。五名参与者最大限度地进行了两种类型的垂直蹲跳（SJA）和没有（SJ）的手臂摆动和两种类型的反向运动垂直跳跃（CJA）和没有（SJ）的手臂摆动。参与者从力平台上跳下，所有表演都用高速摄像机（200 Hz）录像。结合运动学和动力学数据计算跳跃高度、关节力矩和功。结果发现，在四种跳跃条件中，当参与者使用带有反向运动的手臂摆动时，他们跳得最高（即，CJA）。摆臂反跳高度的增加是下肢做功增加的结果。在髋关节中，由反向运动引起的扭矩增加主要发生在推进阶段的开始，而由手臂摆动引起的扭矩增加发生在推进阶段的其余部分。我们的研究的一个关键发现是，手臂摆动和反向运动对下肢工作有独立的影响，它们的影响是加性的CJA产生更大的跳跃高度。(c)2008 Elsevier B.V.保留所有权利。
The Purposes of this study were to quantify and compare how arm swing and countermovement affect lower extremity torque and work during vertical jumping and to gain insight into the mechanisms that enable the arm swing and countermovement to increase jump height. Five participants maximally performed two types of vertical squat jumps with (SJA) and without (SJ) an arm swing and two types of countermovement vertical jumps with (CJA) and without (SJ) an arm swing. The participants jumped from a force platform and all performances were videotaped with a high-speed video camera (200 Hz). jump heights, joint torques and work were calculated by combining kinematic and kinetic data. It was found that of the four jumping conditions, the participants jumped highest when they used an arm swing with countermovement (i.e., CJA). The increase of the countermovement jump height with an arm swing is the result of the increase of the lower extremity work. In the hip joint, the increase in torque caused by the countermovement predominantly occurred at the beginning of the propulsion phase, while the increase in torque caused by the arm swing occurred in the rest of the propulsion phase. A key finding of our study is that arm swing and countermovement have independent effects on lower extremity work, and their effects are additive in CJA to produce greater jump height. (c) 2008 Elsevier B.V. All rights reserved.