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首页> 外文期刊>Journal of Biomechanics >Rotational kinematics of pelvis and upper trunk at butterfly stroke: Can fins affect the dynamics of the system?
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Rotational kinematics of pelvis and upper trunk at butterfly stroke: Can fins affect the dynamics of the system?

机译：蝴蝶中风的骨盆和上干后器的旋转运动学：鳍可以影响系统的动态吗？

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The purpose of the present study was to investigate the rotational kinematics pattern of the upper trunk and the pelvis and the complexity-variability of their movement, during the sprint butterfly stroke between male and female swimmers with long fins (18-26 cm) and without fins. Two pairs of 3D accelerometers and gyroscopes were used to measure segments' flexion-extension angles. There were no gender differences apart from the record. The amplitude values at the pelvis were significantly larger when swimming without fins while at the C7 they were significantly larger when swimming with them. Autocorrelation coefficients of angles' time histories were higher when swimming with fins for both segments. The power spectrums revealed a dominant frequency representing the stroke period which grew significantly stronger for the fin condition. Correlation Dimension verified a lower dimensionality for the fin condition for the C7 segment movement pattern. Overall fin use seems to offer "strength" to the swimmer's movement pattern. This does not imply better movement coordination, but rather a trend toward a more stable attractor. (C) 2016 Elsevier Ltd. All rights reserved.
机译：本研究的目的是调查上躯干和骨盆的旋转运动学模式以及它们运动的复杂性 - 变异性，在长鳍（18-26厘米）和没有鳍。两对3D加速度计和陀螺仪用于测量区段的屈曲 - 延伸角度。与记录相比没有性别差异。在没有翅片的情况下，骨盆下的振幅值显着更大，而在C7时，它们在与它们一起游泳时显着更大。当与两段的鳍片一起游泳时，角度的时间历史的自相关系数更高。功率谱揭示了代表鳍状况大大更强的行程时期的主导频率。相关尺寸验证了C7段运动模式的鳍状况的较低维度。整体鳍使用似乎为游泳者的运动模式提供“力量”。这并不意味着更好的运动协调，而是更稳定的吸引子的趋势。 （c）2016 Elsevier Ltd.保留所有权利。

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