Relationship between dolphin kick movement in humans and velocity during undulatory underwater swimming
Relationship between dolphin kick movement in humans and velocity during undulatory underwater swimming
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DOI：
10.1080/02640414.2021.1881313
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发表时间：
2021-02-18
影响因子：
3.4
通讯作者：
Shimoyama, Yoshimitsu
中科院分区：
文献类型：
--
作者：
Ikeda, Yusuke;Ichikawa, Hiroshi;Shimoyama, Yoshimitsu
本研究的目的是确定与海豚式打腿的性能在加速和减速阶段的运动学变量。九名男子竞技游泳运动员进行了3-5 x 15米海豚式打腿游泳试验，最大的努力。海豚式打腿的水下运动是用数码摄像机记录下来的，用于二维运动分析。上下躯干和腿的角度，除了肩，髋，膝关节的角度作为运动学变量计算。海豚式打腿两个周期内大转子平均水平速度与加速相（r =-0.715，p = 0.05）和减速相（r = 0.682，p = 0.05）下躯干角位移相关。此外，更大的角位移的下躯干与较小的角位移的大腿和较大的角位移的髋关节，膝关节，小腿在这两个阶段。这些结果表明，下躯干的运动是一个关键的运动学变量的海豚式打腿的性能，也是游泳教练和游泳运动员需要专注于下躯干的运动，以及上下肢，以提高海豚式打腿运动。
The present study was conducted to identify the kinematic variables associated with dolphin kick performance during the acceleration and deceleration phases. Nine male competitive swimmers performed 3-5 x 15-m dolphin kick swimming trials with maximum effort. The underwater motion of the dolphin kick was recorded using a digital video camera for a two-dimensional motion analysis. Upper-lower trunk and leg angles in addition to shoulder, hip, and knee joint angles were calculated as kinematic variables. The average horizontal velocity of the greater trochanter during two cycles of the dolphin kick correlated with the angular displacement of the lower trunk in the acceleration (r = -0.715, p < 0.05) and deceleration phases (r = 0.682, p < 0.05). Furthermore, greater angular displacement of the lower trunk was associated with smaller angular displacement of the upper leg and greater angular displacement of the hip, knee, and lower leg in both phases. These results suggest that the movement of the lower trunk is a key kinematic variable for dolphin kick performance, and also that swimming coaches and swimmers need to focus on the movement of the lower trunk as well as upper-lower legs in order to improve dolphin kick motion.