运动强度阈值：确定可持续表现的界限。
Exercise Intensity Thresholds: Identifying the Boundaries of Sustainable Performance.
机构信息
1Canadian Centre for Activity and Aging, University of Western Ontario, London, Ontario, CANADA; 2School of Kinesiology, University of Western Ontario, London, Ontario, CANADA; 3Department of Neurological and Movement Sciences, University of Verona, Verona, ITALY; 4Faculty of Kinesiology, University of Calgary, Calgary, Alberta, CANADA; and 5Department of Physiology and Pharmacology, University of Western Ontario, London, Ontario, CANADA.
出版信息
Med Sci Sports Exerc. 2015 Sep;47(9):1932-40. doi: 10.1249/MSS.0000000000000613.
UNLABELLED
Critical power (CP), respiratory compensation point (RCP), maximal lactate steady state (MLSS), and deoxyhemoglobin breakpoint ([HHb]BP) are alternative functional indices that are thought to demarcate the highest exercise intensity that can be tolerated for long durations.
PURPOSE
We tested the hypothesis that CP, RCP, MLSS, and [HHb]BP occur at the same metabolic intensity by examining the pulmonary oxygen uptake (V˙)O2p and power output (PO) associated with each "threshold."
METHODS
Twelve healthy men (mean ± SD age, 27 ± 3 yr) performed the following tests on a cycle ergometer: i) four to five exhaustive tests for determination of CP, ii) two to three 30-min constant-power trials for MLSS determination, and iii) a ramp incremental exercise test from which the V˙O2p and PO at RCP and [HHb]BP were determined. During each trial, breath-by-breath V˙O2p and ventilatory variables were measured with a metabolic cart and flowmeter turbine; near-infrared spectroscopy-derived [HHb] was monitored using a frequency domain multidistance system, and arterialized capillary blood lactate was sampled at regular intervals.
RESULTS
There were no differences (P > 0.05) among the V˙O2p values associated with CP, RCP, MLSS, and [HHb]BP (CP, 3.29 ± 0.48; RCP, 3.34 ± 0.45; MLSS, 3.27 ± 0.44; [HHb]BP, 3.41 ± 0.46 L·min(-1)); however, the PO associated with RCP (262 ± 48 W) and [HHb]BP (273 ± 41 W) were greater (P < 0.05) than both CP (226 ± 45 W) and MLSS (223 ± 39 W), which, themselves, were not different (P > 0.05).
CONCLUSIONS
Although the standard methods for determination of CP, RCP, MLSS, and [HHb]BP are different, these indices occur at the same V˙O2p, suggesting that i) they may manifest as a result of similar physiological phenomenon and ii) each provides a valid delineation between tolerable and intolerable constant-power exercise.
未加标签
关键功率（CP）、呼吸补偿点（RCP）、最大乳酸稳态（MLSS）和脱氧血红蛋白断点（[HHb]BP）是被认为能区分可耐受长时间的最高运动强度的替代功能指标。
目的
通过检查与每个“阈值”相关的肺摄氧量（V˙O2p）和功率输出（PO），我们假设 CP、RCP、MLSS 和 [HHb]BP 发生在相同的代谢强度。
方法
12 名健康男性（平均年龄 ± 标准差，27 ± 3 岁）在自行车测力计上进行了以下测试：i）进行了 4 到 5 次用于确定 CP 的耗竭测试，ii）进行了 2 到 3 次用于确定 MLSS 的 30 分钟恒功率试验，iii）进行了斜坡递增运动试验，从中确定了 RCP 和 [HHb]BP 的 V˙O2p 和 PO。在每个试验中，使用代谢箱和流量涡轮机对呼吸进行逐口气的 V˙O2p 和通气变量进行测量；使用频域多距离系统监测近红外光谱衍生的[HHb]，并定期取样动脉化毛细血管血乳酸。
结果
CP、RCP、MLSS 和 [HHb]BP 相关的 V˙O2p 值之间没有差异（P > 0.05）（CP，3.29 ± 0.48；RCP，3.34 ± 0.45；MLSS，3.27 ± 0.44；[HHb]BP，3.41 ± 0.46 L·min（-1））；然而，与 RCP（262 ± 48 W）和 [HHb]BP（273 ± 41 W）相关的 PO 更高（P < 0.05），而 CP（226 ± 45 W）和 MLSS（223 ± 39 W）之间没有差异（P > 0.05）。
结论
尽管 CP、RCP、MLSS 和 [HHb]BP 的确定标准不同，但这些指标出现在相同的 V˙O2p 值，这表明：i）它们可能是由于类似的生理现象而表现出来，ii）每个指标都在可耐受和不可耐受的恒功率运动之间提供了有效的划分。
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