TBM Lab, Dipartimento di Bioingegneria, Politecnico di Milano, Milan, Italy.
Respir Physiol Neurobiol. 2011 Jul 31;177(2):162-8. doi: 10.1016/j.resp.2011.03.014. Epub 2011 Mar 22.
We compared the rate of perceived exertion for respiratory (RPE,resp) and leg (RPE,legs) muscles, using a 10-point Borg scale, to their specific power outputs in 10 healthy male subjects during incremental cycle exercise at sea level (SL) and high altitude (HA, 4559 m). Respiratory power output was calculated from breath-by-breath esophageal pressure and chest wall volume changes. At HA ventilation was increased at any leg power output by ∼ 54%. However, for any given ventilation, breathing pattern was unchanged in terms of tidal volume, respiratory rate and operational volumes of the different chest wall compartments. RPE,resp scaled uniquely with total respiratory power output, irrespectively of SL or HA, while RPE,legs for any leg power output was exacerbated at HA. With increasing respective power outputs, the rate of change of RPE,resp exponentially decreased, while that of RPE,legs increased. We conclude that RPE,resp uniquely relates to respiratory power output, while RPE,legs varies depending on muscle metabolic conditions.
我们比较了 10 名健康男性在海平面（SL）和高海拔（HA，4559 米）递增式自行车运动中，使用 10 分 Borg 量表评估的呼吸（RPE，resp）和腿部（RPE，legs）肌肉的感知用力率（RPE）与其特定的功率输出。呼吸功率输出是通过呼吸食管压力和胸壁容积变化逐次计算得出的。在 HA，任何腿部功率输出时的通气量增加了约 54%。然而，对于任何给定的通气量，呼吸模式在潮气量、呼吸频率和不同胸壁腔室的操作容积方面没有变化。RPE，resp 与总呼吸功率输出独特相关，与 SL 或 HA 无关，而任何腿部功率输出的 RPE，legs 在 HA 时加剧。随着各自功率输出的增加，RPE，resp 的变化率呈指数下降，而 RPE，legs 的变化率增加。我们得出结论，RPE，resp 与呼吸功率输出独特相关，而 RPE，legs 则取决于肌肉代谢条件。
