School of Sport and Health Sciences, University of Exeter, Exeter, Devon, England.
Med Sci Sports Exerc. 2010 Oct;42(10):1876-90. doi: 10.1249/MSS.0b013e3181d9cf7f.
For high-intensity muscular exercise, the time-to-exhaustion (t) increases as a predictable and hyperbolic function of decreasing power (P) or velocity (V ). This relationship is highly conserved across diverse species and different modes of exercise and is well described by two parameters: the "critical power" (CP or CV), which is the asymptote for power or velocity, and the curvature constant (W') of the relationship such that t = W'/(P - CP). CP represents the highest rate of energy transduction (oxidative ATP production, V˙O2) that can be sustained without continuously drawing on the energy store W' (composed in part of anaerobic energy sources and expressed in kilojoules). The limit of tolerance (time t) occurs when W' is depleted. The CP concept constitutes a practical framework in which to explore mechanisms of fatigue and help resolve crucial questions regarding the plasticity of exercise performance and muscular systems physiology. This brief review presents the practical and theoretical foundations for the CP concept, explores rigorous alternative mathematical approaches, and highlights exciting new evidence regarding its mechanistic bases and its broad applicability to human athletic performance.
对于高强度肌肉运动，力竭时间 (t) 随功率 (P) 或速度 (V) 的降低呈可预测的双曲线函数增加。这种关系在不同物种和不同运动模式中高度保守，由两个参数很好地描述：“临界功率” (CP 或 CV)，这是功率或速度的渐近线，以及关系的曲率常数 (W')，使得 t = W'/(P - CP)。CP 代表了在不连续消耗能量储备 W'（部分由无氧能量源组成，以千焦耳表示）的情况下可以维持的最高能量转导率（氧化 ATP 产生，V˙O2）。当 W'耗尽时，耐受极限（时间 t）就会出现。CP 概念构成了一个实用框架，用于探索疲劳机制，并有助于解决关于运动表现和肌肉系统生理学的可塑性的关键问题。这篇简短的综述介绍了 CP 概念的实用和理论基础，探讨了严格的替代数学方法，并强调了关于其机械基础及其对人类运动表现的广泛适用性的令人兴奋的新证据。
