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目的探讨静态负荷诱发肌肉疲劳时肌电信号指标与主观疲劳感之间的数量关系。方法记录 1 1名被试持续负重时主观疲劳感量表得分及肱二头肌相应表面肌电信号 ,分析MPF、MF和Lempel ziv复杂度以及持续时间与主观疲劳感量表分数之间的相关 ,并对其间的数量关系进行拟合。结果主观疲劳评定分数与持续时间成显著正相关 ,而与各肌电信号指标成不同程度的显著负相关。以主观疲劳评定分数为因变量 ,以持续时间及各肌电信号指标为自变量的对数函数和幂函数的拟合均具有统计学意义。结论主观疲劳感得分与表面肌电信号指标及持续时间对反映肌肉疲劳状态具有较高一致性 ;其间的数量关系比较符合心理物理学中Stevens幂定律。
Objective To investigate the quantitative relationship between EMG index and subjective fatigue in muscle fatigue induced by static load. Methods The score of subjective fatigue scale and the corresponding surface EMG signal of 1 test participant during sustained load were recorded and the correlation between MPF, MF and Lempel ziv complexity and duration and subjective fatigue scale score was analyzed , And the number of relations between the fit. Results Subjective fatigue score was positively correlated with duration and negatively correlated with each EMG index. Taking the subjective fatigue score as the dependent variable, the logarithmic function and the power function fitting with the duration and each EMG index as independent variables were statistically significant. Conclusion Subjective fatigue score and surface EMG signal index and duration have a high consistency to reflect the state of muscle fatigue; the quantitative relationship between them is more in line with the Stevens law of power in psychophysics.