Bishop D, Bonetti D, Dawson B
Department of Human Movement and Exercise Science, University of Western Australia, Nedlands, WA 6907, Australia.
Med Sci Sports Exerc. 2001 Jun;33(6):1026-32. doi: 10.1097/00005768-200106000-00023.
The purpose of this study was to investigate the influence of warm-up (WU) intensity on supramaximal kayak ergometer performance.
In the initial testing session, eight institute of sport kayak squad members performed a graded exercise test for determination of VO2max and lactate (La) parameters. In a random, counterbalanced order, subjects subsequently performed WU for 15-min at either their aerobic threshold (W1), their anaerobic threshold (W3), or mid-way between their aerobic threshold and anaerobic threshold (W2). A 5-min passive rest period and then a 2-min, all-out kayak ergometer test followed the WU.
For the three different WU conditions, no significant differences were observed for average power, peak VO2, total VO2, total VCO2, or accumulated oxygen deficit (AOD) during the 2-min test. However, when compared with W3, differences in average power approached significance after both W1 (P = 0.09) and W2 (P = 0.10). Furthermore, when compared with W3, average power during the first half of the 2-min test was significantly greater after W2 (P < 0.05) and approached significance after W1 (P = 0.06). After each WU period, there was a significant difference in blood pH (W1>W2>W3; P < 0.05) and blood [La] (W1<W2<W3; P < 0.05). Despite the significantly different metabolic acidemia after each WU condition, there were no significant differences in the VO2 responses to the 2-min test. However, the greater metabolic acidemia after W3 was associated with impaired 2-min kayak ergometer performance.
It was concluded, that although a degree of metabolic acidemia may be necessary to speed O2 kinetics, if the WU is too intense, the associated metabolic acidemia may impair supramaximal performance by reducing the anaerobic energy contribution and/or interfering with muscle contractile processes.
本研究旨在探讨热身强度对超最大强度皮划艇测功仪性能的影响。
在初始测试阶段，8名体育学院皮划艇队队员进行了递增运动测试，以确定最大摄氧量（VO2max）和乳酸（La）参数。随后，受试者按照随机、平衡的顺序，分别在有氧阈值（W1）、无氧阈值（W3）或有氧阈值与无氧阈值之间的中点（W2）进行15分钟的热身。热身结束后，有5分钟的被动休息期，然后进行2分钟的全力皮划艇测功仪测试。
在三种不同的热身条件下，2分钟测试期间的平均功率、峰值VO2、总VO2、总VCO2或累积氧亏（AOD）均未观察到显著差异。然而，与W3相比，W1（P = 0.09）和W2（P = 0.10）后的平均功率差异接近显著水平。此外，与W3相比，2分钟测试前半段的平均功率在W2后显著更高（P < 0.05），在W1后接近显著水平（P = 0.06）。每次热身期后，血液pH值（W1>W2>W3；P < 0.05）和血液[La]（W1<W2<W3；P < 0.05）存在显著差异。尽管每种热身条件后的代谢性酸中毒存在显著差异，但对2分钟测试的VO2反应没有显著差异。然而，W3后更大的代谢性酸中毒与2分钟皮划艇测功仪性能受损有关。
得出的结论是，虽然一定程度的代谢性酸中毒可能是加速氧动力学所必需的，但如果热身强度过大，相关的代谢性酸中毒可能会通过减少无氧能量贡献和/或干扰肌肉收缩过程来损害超最大强度性能。
