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Neuromuscular fatigue and recovery profiles in individuals with intellectual disability

Journal of Sport and Health Science 2019年第3期8卷 242-248页

作者： Rihab Borji Firas Zghal Nidhal Zarrouk Vincent Martin sonia sahli Haithem Rebai Research Unit Education Motor Skills Sports and Health (EM2S UR15JS01) Higher Institute of Sport and Physical Education of SfaxUniversity of Sfax Laboratory of Metabolic Adaptations to Exercise in Physiological and Pathological Conditions Blaise Pascal University

Purpose: This study aimed to explore neuromuscular fatigue and recovery profiles im individuals with intellectual disability(ID) after exhausting submaximal ***: Ten men with ID were compared to 10 men without ID. The evaluation of neuromuscular function consisted in brief(3 s) isometric maximal voluntary contraction(IMVC) of the knee extension superimposed with electrical nerve stimulation before, immediately after, and during33 min after an exhausting submaximal isometric task at 15% of the IMVC. Force, voluntary activation level(VAL), potentiated twitch(Ptw), and electromyography(EMG) signals were measured during IMVC and then ***: Individuals with ID developed lower baseline IMVC, VAL, Ptw; and RMS/M_(max) ratio(root-mean-square value normalized to the maximal peak-to-peak amplitude of the M-wave) than controls(p < 0.05). Nevertheless, the time to task failure was significantly longer in ID vs. controls(p < 0.05). The 2 groups presented similar IMVC decline and recovery kinetics after the fatiguing exercise. However. individuals with ID presented higher VAL and RMS/M_(max) ratio declines but lower Ptw decline compared to those without ID. Moreover, individuals with ID demonstrated a persistent central fatigue but faster recovery from peripheral ***: These differences in neuromuscular fatigue profiles and recovery kinetics should be acknowledged when prescribing training programs for individuals with ID.

关键词： Central fatigue Intellectual disability Neuromuscular fatigue Peripheral fatigue Sustained sub-maximal exercise Twitch interpolation technique

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