University of Campinas, Department of Sports Sciences, Campinas, Brazil.
Int J Sports Med. 2010 Oct;31(10):683-8. doi: 10.1055/s-0030-1255108. Epub 2010 Jul 8.
The aims of this study were to verify the relationship between rating of perceived exertion (RPE) and electromyography (EMG) increases during exhaustive constant-load cycling bouts and, to compare and to correlate the power outputs corresponding to perceived exertion threshold (PET) and neuromuscular fatigue threshold (NFT). 11 men completed 3-4 different exhaustive constant-load cycling bouts on a cycle ergometer, being RPE and EMG measured throughout the bouts. The linear regression of the RPEslope and EMGslope against the power output identified the PET and NFT intensity, respectively. There was a significant relationship between RPEslope and EMGslope (R(2)=0.69; P<0.01). However, the linearity of RPEslope (R(2)=0.93±0.07) was significantly higher (P<0.001) than EMGslope (R(2)=0.63±0.25). In addition, the RPEslope and EMGslope were related to time to exhaustion (r=-0.59 and r=-0.60; P<0.001). There was no significant difference (P=0.42) between PET (201.5±27.9W) and NFT (210.3±22.6W) and they were significantly correlated (r=0.78; P=0.005). Therefore, the RPE and EMG increases during exhaustive constant-load cycling bouts are related and, PET and NFT intensities are similar and closely associated.
本研究旨在验证在进行极限负荷恒定周期运动时，主观疲劳感觉（RPE）评分和肌电图（EMG）增加之间的关系，并比较和相关感知疲劳阈值（PET）和神经肌肉疲劳阈值（NFT）对应的功率输出。11 名男性在自行车测力计上完成了 3-4 个不同的极限负荷恒定周期运动，在整个运动过程中测量 RPE 和 EMG。RPE 斜率和 EMG 斜率与功率输出的线性回归确定了 PET 和 NFT 强度。RPE 斜率和 EMG 斜率之间存在显著的关系（R²=0.69；P<0.01）。然而，RPE 斜率的线性度（R²=0.93±0.07）显著更高（P<0.001），而 EMG 斜率的线性度（R²=0.63±0.25）。此外，RPE 斜率和 EMG 斜率与力竭时间相关（r=-0.59 和 r=-0.60；P<0.001）。PET（201.5±27.9W）和 NFT（210.3±22.6W）之间没有显著差异（P=0.42），它们之间存在显著的相关性（r=0.78；P=0.005）。因此，极限负荷恒定周期运动时 RPE 和 EMG 的增加是相关的，并且 PET 和 NFT 强度相似且密切相关。
