Bishop D, Jenkins D G
Department of Human Studies, University of Queensland, Brisbane, Australia.
Aust J Sci Med Sport. 1996 Dec;28(4):101-5.
The present study examined whether a six-week resistance training program would influence the critical power (CP) function, time to exhaustion (TE) at CP and/or peak oxygen uptake (VO2 peak). The CP function is believed to provide an index of endurance ability (CP given by the slope), and anaerobic work capacity (the y-intercept). Eight healthy, untrained males undertook lower-body resistance training (90 min/day, 3-4 times/wk) for six weeks; eight controls refrained from resistance or endurance training for the same period. Before and immediately following the training period, subjects completed three trials to determine their CP function, a test of VO2 peak, a one-repetition maximum (1-RM) leg press test and TE at their CP. Training significantly increased both 1-RM leg press (28.6%, P < 0.05) and the y-intercept (34.9%, P < 0.05) while no changes in CP, VO2 peak or TE (p > 0.05) were found. Changes in the y-intercept following resistance training were negatively correlated with changes in the CP (r = -0.94, p < 0.05, N = 8). The present data show that the y-intercept of the CP function is sensitive to, and modified by, six weeks of resistance training. Given that resistance training had no significant influence on CP, TE at CP or VO2 peak, the present study has also shown that six weeks of resistance training will not alter indices of endurance ability. The negative relationship between changes in the y-intercept and CP exposes a potential limitation of the linear CP function when evaluating changes in endurance ability following an intervention which significantly alters the y-intercept.
本研究探讨了为期六周的抗阻训练计划是否会影响临界功率（CP）功能、CP 时的力竭时间（TE）和/或最大摄氧量（VO₂峰值）。CP 功能被认为可提供耐力能力指标（由斜率给出的 CP）和无氧工作能力（y 轴截距）。八名健康的未经训练的男性进行了为期六周的下肢抗阻训练（每天 90 分钟，每周 3 - 4 次）；八名对照组在同一时期不进行抗阻或耐力训练。在训练期之前和之后，受试者完成了三项试验以确定其 CP 功能、VO₂峰值测试、一次重复最大负荷（1-RM）腿举测试以及 CP 时的 TE。训练显著增加了 1-RM 腿举（28.6%，P < 0.05）和 y 轴截距（34.9%，P < 0.05），而未发现 CP、VO₂峰值或 TE 有变化（P > 0.05）。抗阻训练后 y 轴截距的变化与 CP 的变化呈负相关（r = -0.94，P < 0.05，N = 8）。目前的数据表明，CP 功能的 y 轴截距对抗阻训练六周敏感且会被其改变。鉴于抗阻训练对 CP、CP 时的 TE 或 VO₂峰值没有显著影响，本研究还表明六周的抗阻训练不会改变耐力能力指标。y 轴截距变化与 CP 之间的负相关关系揭示了在评估显著改变 y 轴截距的干预后耐力能力变化时线性 CP 功能的一个潜在局限性。
