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  • Changes in surface EMG signal under the influence of peripheral fatigue
    Tomažin, Katja ; Strojnik, Vojko ; Šarabon, Nejc
    The purpose of this study was to find out if surface EMG signal enables a differentiation between high- and low-frequency peripheral fatigue that was caused with two different sport activities. Ten ... students (age, 24.2[plus minus]3.39 years; weight 79.32[plus minus]12,95 kg) performed consecutive hops for 60 s (to inducehigh-frequency fatigue) and cycling at maximal intensity for 30 s (to induce low-frequency fatigue). Before and after both activities, the m. vastus lateralis was stimulated with 2 consecutive trains at 20 Hz and 100 Hz and, at the same time, the torque at the knee joint was measured. The torque ratio between 100 Hz and 20 Hz was calculated to define the type of peripheral fatigue. Additionally a response of m. vastus lateralisto 2 supramaximal electrical impulses delivered to the femoral nerve at 50 Hz was measured. Hopping resulted in high-frequency fatigue, the ratio between forces at 100 Hz and 20 Hz decreased for 10.7[plus minus]8.3% (p<.01) after hopping. Cycling resulted in low-frequency fatigue, the ratio increased for 31.1[plus minus]24.8% (p<.01) after cycling. There were no statistically significant changes between the first and second M-wave. It was concluded thatM-wave, observed by surface EMG, was not sensitive to different types of peripheral fatigue, assuming that the changes in peripheral fatigue after both activities took place distal to saracolemma.
    Source: European journal of sport science [[electronic resource]] : EJSS. - ISSN 1536-7290 (Vol. 2, no. 5, 2002)
    Type of material - e-article ; adult, serious
    Publish date - 2002
    Language - english
    COBISS.SI-ID - 1728433

    Link(s):

    http://www.informaworld.com/smpp/content~content=a744114673~db=all~order=page

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