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首页> 外文期刊>Journal of human kinetics >Analysis on the Time and Frequency Domains of the Acceleration in Front Crawl Stroke
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Analysis on the Time and Frequency Domains of the Acceleration in Front Crawl Stroke

机译：前爬行行程加速的时频域分析

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The swimming involves accelerations and decelerations in the swimmer's body. Thus, the main objective of this study is to make a temporal and frequency analysis of the acceleration in front crawl swimming, regarding the gender and the performance. The sample was composed by 31 male swimmers (15 of high-level and 16 of low-level) and 20 female swimmers (11 of high-level and 9 of low-level). The acceleration was registered from the third complete cycle during eight seconds in a 25 meters maximum velocity test. A position transducer (200Hz) was used to collect the data, and it was synchronized to an aquatic camera (25Hz). The acceleration in the temporal (root mean square, minimum and maximum of the acceleration) and frequency (power peak, power peak frequency and spectral area) domains was calculated with Fourier analysis, as well as the velocity and the spectrums distribution in function to present one or more main peaks (type 1 and type 2). A one-way ANOVA was used to establish differences between gender and performance. Results show differences between genders in all the temporal domain variables (p<0.05) and only the Spectral Area (SA) in the frequency domain (p<0.05). Between gender and performance, only the Root Mean Square (RMS) showed differences in the performance of the male swimmers (p<0.05) and in the higher level swimmers, the Maximum (Max) and the Power Peak (PP) of the acceleration showed differences between both genders (p<0.05). These results confirms the importance of knowing the RMS to determine the efficiency of the swimmers regarding gender and performance level
机译：游泳涉及游泳者身体的加速和减速。因此，本研究的主要目的是就性别和表现对前爬泳的加速度进行时间和频率分析。样本由31名男性游泳者（高级别的15名和低级16名）和20名女性游泳者（高级的11名和低级的9名）组成。在25米的最大速度测试中，从第三个完整周期开始的八秒钟内记录了加速度。使用位置传感器（200Hz）收集数据，并将其同步到水上相机（25Hz）。使用傅立叶分析计算时间（均方根，加速度的最小和最大值）和频率（功率峰值，功率峰值频率和频谱区域）域中的加速度，以及函数中的速度和频谱分布，以得出一个或多个主峰（类型1和类型2）。单向方差分析用于确定性别与绩效之间的差异。结果表明，在所有时域变量中，性别之间的差异（p <0.05），而在频域中，只有光谱区域（SA）之间的差异（p <0.05）。在性别和性能之间，只有均方根（RMS）表现出男性游泳者的表现差异（p <0.05），而较高水平的游泳者则显示出加速度的最大值（Max）和功率峰值（PP）性别差异（p <0.05）。这些结果证实了了解RMS来确定游泳者关于性别和表现水平的效率的重要性

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