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    ASIA unversity > 管理學院 > 國際企業學系 > 期刊論文 >  Item 310904400/79750


    Please use this identifier to cite or link to this item: http://asiair.asia.edu.tw/ir/handle/310904400/79750


    Title: Fatigue Effect on Low-Frequency Force Fluctuations and Muscular Oscillations during Rhythmic Isometric Contraction
    Authors: 林彥廷;Lin, Yen-Ting;郭家驊;Kuo, Chia-Hua;黃英修;Hwang, Ing-Shiou
    Contributors: 體育室
    Date: 2014-01
    Issue Date: 2014-06-05 12:03:08 (UTC+8)
    Abstract: Continuous force output containing numerous intermittent force pulses is not completely smooth. By characterizing force fluctuation properties and force pulse metrics, this study investigated adaptive changes in trajectory control, both forcegenerating capacity and force fluctuations, as fatigue progresses. Sixteen healthy subjects (20–24 years old) completedn rhythmic isometric gripping with the non-dominant hand to volitional failure. Before and immediately following the fatigue intervention, we measured the gripping force to couple a 0.5 Hz sinusoidal target in the range of 50–100% maximal voluntary contraction. Dynamic force output was off-line decomposed into 1) an ideal force trajectory spectrally identical to the target rate; and 2) a force pulse trace pertaining to force fluctuations and error-correction attempts. The amplitude of ideal force trajectory regarding to force-generating capacity was more suppressed than that of the force pulse trace with increasing fatigue, which also shifted the force pulse trace to lower frequency bands. Multi-scale entropy analysis revealed that the complexity of the force pulse trace at high time scales increased with fatigue, contrary to the decrease in complexity of the force pulse trace at low time scales. Statistical properties of individual force pulses in the spatial and temporal domains varied with muscular fatigue, concurrent with marked suppression of gamma muscular oscillations (40–60 Hz) in the post-fatigue test. In conclusion, this study first reveals that muscular fatigue impairs the amplitude modulation of force pattern generation more than it affects the amplitude responsiveness of fine-tuning a force trajectory. Besides,motor fatigue results disadvantageously in enhancement of motor noises, simplification of short-term force-tuning strategy,and slow responsiveness to force errors, pertaining to dimensional changes in force fluctuations, scaling properties of force pulse, and muscular oscillation.
    Relation: PLoS One,9(1): e85578.
    Appears in Collections:[國際企業學系] 期刊論文

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