Pringle Jamie S M, Carter Helen, Doust Jonathan H, Jones Andrew M
Department of Exercise and Sport Science, Manchester Metropolitan University, Hassall Road, Alsager, ST7 2HL, UK.
Eur J Appl Physiol. 2002 Nov;88(1-2):163-9. doi: 10.1007/s00421-002-0687-0. Epub 2002 Sep 13.
The aim of this study was to examine the effect of increasing the ratio of concentric to eccentric muscle activation on oxygen uptake (VO(2)) kinetics during treadmill running. Nine subjects [2 women; mean (SD) age 29 (7) years, height 1.77 (0.07) m, body mass 73.0 (7.5) kg] completed incremental treadmill tests to exhaustion at 0% and 10% gradients to establish the gradient-specific ventilatory threshold (VT) and maximal oxygen uptake (VO(2max)). Subsequently, the subjects performed repeated moderate intensity (80% of gradient-specific VT) and heavy intensity (50% of the difference between the gradient specific VT and VO(2max)) square-wave runs with the treadmill gradient set at 0% and 10%. For moderate intensity exercise, there were no significant differences between treadmill gradients for VO(2) kinetics. For heavy intensity exercise, the amplitude of the primary component of VO(2) was not significantly different between 0% and 10% treadmill gradients [mean (SEM) 2,940 (196) compared to 2,869 (156) ml x min(-1), respectively], but the amplitude of the VO(2) slow component was significantly greater at the 10% gradient [283 (43) compared to 397 (37) ml x min(-1); P < 0.05]. These results indicate that the muscle contraction regimen (i.e. the relative contribution of concentric and eccentric muscle action) significantly influences the amplitude of the VO(2) slow component.
本研究旨在探讨在跑步机跑步过程中增加向心肌肉激活与离心肌肉激活的比例对摄氧量（VO₂）动力学的影响。九名受试者[2名女性；平均（标准差）年龄29（7）岁，身高1.77（0.07）米，体重73.0（7.5）千克]在0%和10%的坡度下完成递增式跑步机测试直至力竭，以确定坡度特异性通气阈值（VT）和最大摄氧量（VO₂max）。随后，受试者在跑步机坡度设置为0%和10%的情况下进行重复的中等强度（坡度特异性VT的80%）和高强度（坡度特异性VT与VO₂max差值的50%）方波跑步。对于中等强度运动，VO₂动力学在跑步机坡度之间无显著差异。对于高强度运动，VO₂主要成分的幅度在0%和10%跑步机坡度之间无显著差异[平均（标准误）分别为2940（196）和2869（156）毫升·分钟⁻¹]，但VO₂慢成分的幅度在10%坡度时显著更大[283（43）与397（37）毫升·分钟⁻¹相比；P<0.05]。这些结果表明肌肉收缩方式（即向心和离心肌肉作用的相对贡献）显著影响VO₂慢成分的幅度。
