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首页> 外文期刊>Journal of human kinetics >Kinematics of the Hip and Body Center of Mass in Front Crawl
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Kinematics of the Hip and Body Center of Mass in Front Crawl

机译：前爬网髋关节和身体重心的运动学

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摘要

The kinematic profiles of the hip and center of mass in front crawl swimming were compared to quantify the error of using a fixed body point to assess intracyclic velocity variations at moderate intensity exercise. The practical goal was to provide a useful tool, easy and fast to assess, and to use as feedback, for assessing swimming efficiency. Sixteen swimmers performed an intermittent incremental protocol that allowed assessing the individual anaerobic threshold velocity. One complete stroke cycle was analysed at the step intensity corresponding to each swimmer's anaerobic threshold. The subjects were videotaped in the sagittal plane using a double camera set-up for two-dimensional kinematical analyses. The hip and the center of mass presented similar mean velocity and displacement values, being highly related to both parameters. However, the hip reflects the center of mass forward velocity and horizontal displacement with 7.54% and 3.24% associated error, respectively. Differences between hip and center of mass were observed for intracyclic velocity variations (0.19±0.05 and 0.25±0.08, respectively, for a p<0.001), and the negative mean error value found (-0.06) evidenced a tendency of the hip to overestimate the center of mass velocity variation. It is possible to conclude that the hips forward movements might provide a good estimate of the swimmer's horizontal velocity and displacement that is relevant for diagnostic purposes, especially to assess swimming efficiency through the intracyclic velocity variations. Nevertheless, the hip point error magnitude should be taken into consideration in data interpretation.
机译：比较了前爬泳中臀部和重心的运动学特征，以量化使用固定的身体点来评估中等强度运动时周期内速度变化的误差。实际目标是提供一种易于评估，方便快捷的有用工具，并将其用作评估游泳效率的反馈。 16名游泳者执行了间歇性递增方案，可以评估各个无氧阈速度。以与每个游泳者的厌氧阈值相对应的步长强度分析一个完整的中风周期。使用二维二维运动学分析的双摄像头装置在矢状平面上对受试者进行录像。髋关节和质心呈现相似的平均速度和位移值，与两个参数高度相关。但是，髋部反映了质量向前速度和水平位移的中心，分别具有7.54％和3.24％的相关误差。对于周期内速度变化，观察到髋与质心之间的差异（对于ap <0.001，分别为0.19±0.05和0.25±0.08），发现的负平均误差值（-0.06）证明了髋关节高估了髋关节的趋势。质心速度变化中心。可以得出这样的结论，即臀部向前运动可能会很好地估计游泳者的水平速度和位移，这与诊断目的有关，尤其是通过周期内速度变化评估游泳效率。然而，在数据解释中应考虑髋点误差幅度。

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