Barnett C, Jenkins D, MacKinnon L, Green S
Department of Human Movement Studies, University of Queensland, Australia.
Med Sci Sports Exerc. 1996 Dec;28(12):1505-9. doi: 10.1097/00005768-199612000-00010.
This investigation compared the variance in times to exhaustion among four different methods of supra-VO2peak power output calculation. Ten male subjects cycled to exhaustion at power outputs equivalent to 1) 120% VO2peak, 2) 6 W.kg-1, 3) 100% VO2peak + 10% of the peak anaerobic scope (PAS), and 4) 100% VO2peak + 20% of the mean anaerobic scope (MAS). PAS was defined as the difference between the peak power output (PPO) during a 30-s all-out cycle sprint and the power output at VO2peak MAS was defined as the difference between the mean power output (MPO) during a 30-s all-out cycle sprint and the power output at VO2peak. While the mean times to exhaustion for the four methods were not significantly different, the supra-VO2peak power output calculated as 120% VO2peak resulted in significantly more variance (P = 0.0173) in the times to exhaustion than did the power output equivalent to 20% MAS + 100% VO2peak (SE 16.2 s vs 6.9 s). The variance in time to exhaustion was significantly higher with the power output of 6 W.kg-1 than for the remaining three methods, while the variance in times to exhaustion at a power output of 10% PAS + 100% VO2peak was not significantly different from either 120% VO2peak or 20% MAS + 100% VO2peak. These results indicate that a supra-VO2peak power output that accounts for both aerobic ability and anaerobic work capacity (20% MAS + 100% VO2peak) results in less variance in time to exhaustion than a method which extrapolates the submaximal power output-VO2 relationship to a supramaximal intensity (120% VO2peak).
本研究比较了四种不同的超VO₂峰值功率输出计算方法在力竭时间上的差异。十名男性受试者以相当于以下功率输出骑行至力竭：1）120%VO₂峰值；2）6W·kg⁻¹；3）100%VO₂峰值+10%的峰值无氧范围（PAS）；4）100%VO₂峰值+20%的平均无氧范围（MAS）。PAS定义为30秒全力骑行冲刺期间的峰值功率输出（PPO）与VO₂峰值时的功率输出之差；MAS定义为30秒全力骑行冲刺期间的平均功率输出（MPO）与VO₂峰值时的功率输出之差。虽然四种方法的平均力竭时间没有显著差异，但以120%VO₂峰值计算的超VO₂峰值功率输出在力竭时间上产生的差异（P = 0.0173）显著大于相当于20%MAS + 100%VO₂峰值的功率输出（标准误分别为16.2秒和6.9秒）。6W·kg⁻¹功率输出时的力竭时间差异显著高于其余三种方法，而10%PAS + 100%VO₂峰值功率输出时的力竭时间差异与120%VO₂峰值或20%MAS + 100%VO₂峰值时均无显著差异。这些结果表明，一种同时考虑有氧能力和无氧工作能力的超VO₂峰值功率输出（20%MAS + 100%VO₂峰值）与一种将次最大功率输出-VO₂关系外推至超最大强度（120%VO₂峰值）的方法相比，在力竭时间上产生的差异更小。
