CHANGES OF sEMG PARAMETERS DURING ISOMETRIC FATIGUING CONTRACTIONS AND RECOVERY PERIOD
等长收缩诱发肌肉疲劳及恢复过程中表面肌电信号特征变化规律

Surface electromyographic (sEMG) signals during isometric fatiguing contractions were ana-lyzed with both linear and non-linear method to investigate the possible factor which dominated the changes in sEMG signals.The results demonstrated that the sEMG parameter,average EMG (AEMG),mean power frequency (MPF),Lempel-Ziv complexity (C(n)) and Determinism% (?T) in bicep bracii (BB) muscle,changed regularly during fatiguing contractions.In recovering period AEMG did not show observable regularity while MFP,C(n) and ?T remarkably recovered only by 2 seconds.These three parameters regressed rapidly in the initial 10 seconds and then slowed down.The rapid changes of sEMG parameters in recovery periods suggest that central controlling factor may play a more important role in shaping sEMG signals.