本研究探讨了等长负荷诱发腰部脊竖肌疲劳过程中 s EMG信号的时、频指标变化规律和特点。研究发现 :时域指标在肌肉疲劳过程变化的特异性较差 ,而频域指标的特异性较好 ,且其时间序列曲线的斜率与等长负荷持续时间呈明显统计相关。研究结果表明 ,s EMG频域指标时间序列曲线的斜率是评价腰部脊竖肌功能的较好指标 In this study, we investigated the regularity and characteristics of the time and frequency indices of s EMG signals in the process of isometric load-induced lumbar spine vertical muscle fatigue. The study found that the time-domain index is less specific in the process of muscle fatigue, while the frequency-domain index is better, and the slope of the time-series curve is obviously related to the duration of the same-length load. The results show that the slope of time series curve of s EMG frequency domain index is a good indicator