Effect of fatigue on the intra-cycle acceleration in front crawl swimming: A time-frequency analysis

Details Effect of fatigue on the intra-cycle acceleration in front crawl swimming: A time-frequency analysis Effect of fatigue on the intra-cycle acceleration in front crawl swimming: A time-frequency analysis

2008-01-18

arxiv.org/abs/0801.2854v1

Journal of Biomechanics 41 (2008) 86

Physics

Medical Physics

18 pages, 2 figures, 4 tables

Scientific paper

The present study analyzes the changes in acceleration produced by swimmers before and after fatiguing effort. The subjects (n=15) performed a 25-meter crawl series at maximum speed without fatigue, and a second series with fatigue. The data were registered with a synchronized system that consisted in a position transducer (1 kHz) and a video photogrametry (50Hz). The acceleration (ms-2) was obtained by the derivative analysis of the variation of the position with time. The amplitude in the time domain was calculated with the root mean square (RMS); while the peak power (PP), the peak power frequency (PPF) and the spectrum area (SA) was calculated in the frequency domain with Fourier analysis. On one hand, the results of the temporal domain show that the RMS change percentage between series was 67.5% (p<0.001). On the other hand, PP, PPF, and SA show significant changes (p<0.001). PP and SA were reduced by 63.1% and 59.5%, respectively. Our results show that the acceleration analysis of the swimmer with Fourier analysis permits a more precise understanding of which propulsive forces contribute to the swimmer performance before and after fatigue appears.

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