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为探索K+、H+与肌肉疲劳和肌电变化的关系，检测了同一批受试者200W和120W蹬功率车至疲劳前和运动后即刻、5min，10min、20min时，血K+、血PH值以及活动肌和非活动肌定量负荷等长收缩10s的EMG。结果表明，两次运动后血K+和AM－MPF、明显改变（P＜0．001），二者高度负相关，并在20min时基本恢复。200W运动后20min内血PH值一直明显低于安静值（P＜0．001），但在120W运动后无变化，并与肌电无相关关系。120W运动后20min内的IM－IEMG明显低于安静值（P＜0．05）。结果表明，细胞外高K+是肌肉疲劳和AM－MPF下降的主要因素之一，并可能也是IM-IEMG下降的原因之一。H+不是疲劳形成的主在原因，并对肌电无直接影响。
In order to explore the relationship between K +, H + and muscle fatigue and EMG changes, the same group of 200W and 120W pedaling power car was tested before fatigue and immediately after exercise, 5min, 10min, 20min, blood K +, blood PH value and Active muscle and inactive muscle quantitative load isometric contraction 10s EMG. The results showed that blood K + and AM-MPF significantly changed after two exercises (P <0.001), the two were highly negative correlation and recovered basically at 20min. The blood PH value within 200 min after 200 W exercise was significantly lower than the resting value (P <0.001), but no change after 120 W exercise, and had no correlation with EMG. IM-IEMG within 120 min after 120 W exercise was significantly lower than the resting value (P <0.05). The results show that extracellular high K + is one of the main factors of muscle fatigue and AM-MPF decline, and may also be one of the reasons for the decline of IM-IEMG. H + is not the main cause of fatigue and has no direct effect on EMG.