Applied Physiology, Nutrition, and Metabolism, Ahead of Print.
There is a pervasive belief that the severe-intensity domain is defined as work rates above the power associated with a maximal lactate steady state (MLSS) and by a oxygen uptake (V̇O2) response that demonstrates a rapid increase (primary phase) followed by a slower increase (slow component), which leads to maximal oxygen uptake (V̇O2max) if exercise is continued long enough. Fifteen university students performed 5 to 7 tests to calculate power at MLSS (154 ± 29 W). The tests included 30 min of exercise at each of 3 work rates: (i) below (–2 ± 1 W) power at MLSS, (ii) above (+4 ± 1 W) the power at MLSS, and (iii) well above (+19 ± 8 W) power at MLSS. The V̇O2 response in each test was described using mathematical modeling. Contrary to expectation, the response at the supra-MLSS work rates had not 2, but 3, distinct phases: the primary phase and the slow component, plus a “delayed” third phase, which emerged after ∼15 min. V̇O2max was not attained at supra-MLSS work rates. These results challenge commonly held beliefs about definitions and descriptions of exercise intensity domains. Novelty: The V̇O2 response at work rates that are too high to sustain a lactate steady state but not high enough to elicit V̇O2max features not 2, but 3, distinct phases. There is no consensus on whether intensity domains should be defined by their boundaries or by the responses they engender.

中文翻译：

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高于最大乳酸稳态的运动不会引起 V̇O2 缓慢成分，从而导致达到 V̇O2max

应用生理学、营养学和代谢，提前出版。
人们普遍认为，严重强度域被定义为高于与最大乳酸稳态 (MLSS) 和摄氧量 (V̇O2) 相关的功率的工作速率，该响应表明快速增加（初级阶段），然后是缓慢增加（缓慢分量），如果运动持续足够长的时间，这会导致最大摄氧量 (V̇O2max)。15 名大学生进行了 5 到 7 次测试以计算 MLSS (154 ± 29 W) 的功率。测试包括以 3 种工作速率中的每一种进行 30 分钟的锻炼：(i) 低于 (–2 ± 1 W) MLSS 功率，(ii) 高于 (+4 ± 1 W) MLSS 功率，以及 (iii) 良好MLSS 时高于 (+19 ± 8 W) 功率。使用数学模型描述每个测试中的 V̇O2 响应。与预期相反，超 MLSS 工作速率下的响应不是 2 个，而是 3 个不同的阶段：初级阶段和缓慢的部分，加上一个“延迟”的第三阶段，大约 15 分钟后出现。在超 MLSS 工作速率下未达到 V̇O2max。这些结果挑战了人们对运动强度领域的定义和描述的普遍看法。新颖性：V̇O2 响应在工作速率太高而无法维持乳酸稳态但又不足以引起 V̇O2max 的特征不是 2 个，而是 3 个不同的阶段。关于强度域是否应该由它们的边界或它们产生的响应来定义，目前还没有达成共识。V̇O2 响应在工作速率太高而无法维持乳酸稳态但不足以引起 V̇O2max 的特征不是 2 个，而是 3 个不同的阶段。关于强度域是否应该由它们的边界或它们产生的响应来定义，目前还没有达成共识。V̇O2 响应在工作速率太高而无法维持乳酸稳态但不足以引起 V̇O2max 的特征不是 2 个，而是 3 个不同的阶段。关于强度域是否应该由它们的边界或它们产生的响应来定义，目前还没有达成共识。