Department of Sport and Exercise Science, Aberystwyth University, Ceredigion, United Kingdom.
Med Sci Sports Exerc. 2011 Nov;43(11):2171-9. doi: 10.1249/MSS.0b013e31821ff26d.
This study aimed to investigate the influence of prior heavy- and severe-intensity exercise on the oxygen uptake (V·O₂) kinetics and the power-duration relationship.
Ten cyclists performed 13 exercise tests during a 4-wk period, consisting of a ramp test to determine the gas exchange threshold (GET) and the peak V·O₂, followed by a series of square-wave tests to exhaustion under three conditions: no prior exercise (control), prior heavy exercise (6 min at a work rate above GET but below critical power [CP)], and prior severe exercise (6 min at a work rate above the CP). Pulmonary gas exchange was measured throughout the exhaustive exercise bouts and the parameters of the power-duration relationship (CP and the curvature constant, W') were determined from the linear work-time model.
Prior heavy exercise increased the amplitude of the primary V·O₂ response (by ∼ 0.19 ± 0.28 L·min(-1), P = 0.001), reduced the V·O₂ slow component trajectory (by 0.04 ± 0.09 L·min(-2), P = 0.002), and increased the time to exhaustion (by ∼ 52 ± 92 s, P = 0.005). The CP was unchanged (control vs prior heavy: 284 ± 47 vs 283 ± 44 W; 95% confidence interval, -7 to 5 W), whereas the W' was increased by heavy-intensity priming (16.0 ± 4.8 vs 18.7 ± 4.8 kJ; 95% confidence interval, 0.3-5.2 kJ). Severe-intensity exercise had a similar effect on the V·O₂ kinetics but had no effect on the time to exhaustion, the CP (275 ± 45 W), or the W' (16.7 ± 4.7 kJ).
Prior heavy-intensity exercise primes the V·O₂ kinetics and increases the amount of work that can be performed above the CP.
本研究旨在探讨先前高强度和剧烈强度运动对摄氧量（V·O₂）动力学和功率-时间关系的影响。
10 名自行车运动员在 4 周内进行了 13 项运动测试，包括斜坡测试以确定气体交换阈值（GET）和峰值 V·O₂，然后在三种条件下进行一系列方波至力竭测试：无先前运动（对照）、先前高强度运动（6 分钟，工作率高于 GET 但低于临界功率 [CP]）和先前剧烈运动（6 分钟，工作率高于 CP）。在整个剧烈运动期间测量肺换气，并从线性工作时间模型中确定功率-时间关系的参数（CP 和曲率常数，W'）。
先前的高强度运动增加了主要 V·O₂反应的幅度（增加约 0.19 ± 0.28 L·min(-1)，P = 0.001），减少了 V·O₂缓慢成分轨迹（减少 0.04 ± 0.09 L·min(-2)，P = 0.002），并延长了力竭时间（延长约 52 ± 92 s，P = 0.005）。CP 保持不变（对照与先前的高强度：284 ± 47 与 283 ± 44 W；95%置信区间，-7 至 5 W），而 W'则因高强度运动而增加（16.0 ± 4.8 与 18.7 ± 4.8 kJ；95%置信区间，0.3-5.2 kJ）。剧烈强度运动对 V·O₂动力学具有相似的影响，但对力竭时间、CP（275 ± 45 W）或 W'（16.7 ± 4.7 kJ）没有影响。
先前的高强度运动使 V·O₂动力学得到优化，并增加了可以在 CP 以上完成的工作量。
