Sports Performance Research Institute New Zealand, Auckland University of Technology, Auckland, New Zealand.
Department of Biology, University of Ottawa, Ottawa, Canada.
Eur J Appl Physiol. 2022 Nov;122(11):2385-2392. doi: 10.1007/s00421-022-05020-3. Epub 2022 Aug 10.
The three-minute all-out test (3MT), when performed on a laboratory ergometer in a linear mode, can be used to estimate the heavy-severe-intensity transition, or maximum metabolic steady state (MMSS), using the end-test power output. As the 3MT only requires accurate measurement of power output and time, it is possible the 3MT could be used in remote settings using personal equipment without supervision for quantification of MMSS.
The aim of the present investigation was to determine the reliability and validity of remotely performed 3MTs (3MT) for estimation of MMSS. Accordingly, 53 trained cyclists and triathletes were recruited to perform one familiarisation and two experimental 3MT trials to determine its reliability. A sub-group (N = 10) was recruited to perform three-to-five 30 min laboratory-based constant-work rate trials following completion of one familiarisation and two experimental 3MT trials. Expired gases were collected throughout constant-work rate trials and blood lactate concentration was measured at 10 and 30 min to determine the highest power output at which steady-state [Formula: see text] (MMSS-[Formula: see text]) and blood lactate (MMSS-[La]) were achieved.
The 3MT end-test power (EP) was reliable (coefficient of variation, 4.5% [95% confidence limits, 3.7, 5.5%]), but overestimated MMSS (EP, 283 ± 51 W; MMSS-[Formula: see text], 241 ± 46 W, P = 0.0003; MMSS-[La], 237 ± 47 W, P = 0.0003). This may have been due to failure to deplete the finite work capacity above MMSS during the 3MT.
These results suggest that the 3MT should not be used to estimate MMSS in endurance-trained cyclists.
在实验室测功仪上以直线模式进行的三分钟全力测试（3MT），可以使用终末测试功率输出来估计高强度-剧烈强度过渡，或最大代谢稳态（MMSS）。由于 3MT 仅需要准确测量功率输出和时间，因此有可能在没有监督的情况下使用个人设备在远程环境中进行 3MT，以量化 MMSS。
本研究的目的是确定远程执行 3MT（3MT）估计 MMSS 的可靠性和有效性。为此，招募了 53 名训练有素的自行车手和三项全能运动员进行一次熟悉和两次实验性 3MT 试验，以确定其可靠性。招募了一个亚组（N=10）进行三次到五次 30 分钟实验室恒功试验，之后完成一次熟悉和两次实验性 3MT 试验。在恒功试验过程中收集呼出气体，并在 10 分钟和 30 分钟测量血乳酸浓度，以确定稳态 [Formula: see text]（MMSS-[Formula: see text]）和血乳酸（MMSS-[La]）达到的最高功率输出。
3MT 终末测试功率（EP）是可靠的（变异系数，4.5% [95%置信区间，3.7, 5.5%]），但高估了 MMSS（EP，283±51 W；MMSS-[Formula: see text]，241±46 W，P=0.0003；MMSS-[La]，237±47 W，P=0.0003）。这可能是由于在 3MT 中未能耗尽高于 MMSS 的有限工作能力所致。
这些结果表明，3MT 不应用于估计耐力训练的自行车手的 MMSS。
