Vertical body position during front crawl increases linearly with swimming velocity and the rate of its increase depends on individual swimmers
Vertical body position during front crawl increases linearly with swimming velocity and the rate of its increase depends on individual swimmers
复制标题
自由泳时的垂直身体位置随游泳速度线性增加，其增加速度取决于个体游泳者
DOI：
10.1080/14763141.2022.2071329
复制
发表时间：
2022
影响因子：
2.2
通讯作者：
Murai Akihiko
中科院分区：
文献类型：
--
作者：
Washino Sohei;Yoshitake Yasuhide;Mankyu Hirotoshi;Murai Akihiko
在游泳过程中的垂直身体位置被认为是密切影响阻力。因此，它与游泳速度相关联;然而，游泳速度和垂直身体位置之间的关联尚未充分建立。在这里，我们的目的是澄清如何垂直的身体位置增加与前爬泳速度和是否有速度效应的个体差异。11名大学水平的男性游泳运动员在不同的游泳速度下进行了15米的前爬泳，持续用力最大吸气。身体的质心（CoM）估计从个人的数字人体模型与惯性参数使用逆运动学。在一个划水周期内，将水平CoM速度和垂直CoM位置取平均值，分别作为游泳速度和垂直体位的指标。线性混合效应模型分析表明，有一个积极的趋势之间的游泳速度和垂直CoM的位置在前爬泳的参与者。这些结果表明，游泳速度与身体的垂直位置在前爬泳。此外，具有随机截距和斜率的线性混合效应模型比仅具有随机截距的模型拟合得更好，表明垂直体位对游泳速度的增加率存在个体间差异。
Vertical body position during swimming is assumed to closely affect drag. It is consequently associated with swimming velocity; however, the association between swimming velocity and vertical body position has not yet been sufficiently established. Here, we aimed to clarify how vertical body position increases with front crawl velocity and whether there are inter-individual differences in velocity effect. Eleven college-level male swimmers performed a 15 m front crawl with sustained forced maximal inspiration at various swimming velocities. The body’s centre of mass (CoM) was estimated from individual digital human models with inertial parameters using inverse kinematics. The horizontal CoM velocity and vertical CoM position from the water surface were averaged for one stroke cycle as respective indexes of swimming velocity and vertical body position. Linear mixed-effects model analysis revealed that there is a positive trend between swimming velocity and vertical CoM position during front crawl across the participants. These results indicate that swimming velocity is associated with vertical body position during front crawl. Additionally, the linear mixed-effects model with random intercepts and slopes was a better fit than that with only random intercepts, indicating that there are inter-individual differences in the rate of increase in vertical body position against swimming velocity.