Pacitti Lauren J, Laberge Joshua, Shikaze Kaitlyn E, Drouin Patrick J, Tschakovsky Michael E, McGlory Chris, Gurd Brendon J
School of Kinesiology and Health Studies, Queen's University, Kingston, ON, K7L 3N6, Canada.
Eur J Appl Physiol. 2025 Feb;125(2):317-326. doi: 10.1007/s00421-024-05600-5. Epub 2024 Sep 5.
The aim of this study was to test the hypothesis that using threshold-based high intensity interval training (HIIT) prescribed at an intensity above critical power (CP) in males and females matched for maximal oxygen uptake ( Omax) (mL/kg lean mass/min) will yield no sex differences in time to fatigue.
Thirteen males (mean ± SD: 22.0 ± 2.48 years, 181 ± 8.36 cm, 78.8 ± 11.4 kg) and eleven females (mean ± SD: 22.4 ± 2.69 years, 170 ± 5.73 cm, 65.2 ± 7.66 kg) initially undertook an incremental test to exhaustion to determine Omax, and a CP test. Then, one HIIT session (4 min on, 2 min off) was performed to exhaustion at the work rate associated with 105%CP. Acute physiological and cardiovascular responses were recorded.
No sex differences were recorded in time to fatigue [Female vs. Male (min): 36.0 ± 18.5 vs. 39.3 ± 16.3], heart rate, rate of perceived exertion, or %oxygenated [haem]. Females displayed lower %deoxygenated [haem] at the end of interval 1, 2, 3, and 4 [Female vs. Male (%): 89.4 ± 21.2 vs. 110 ± 27.3, 92.0 ± 21.5 vs. 115 ± 27.6, 87.1 ± 23.7 vs. 112 ± 22.8, 88.9 ± 26.3 vs. 113 ± 23.5]. Large interindividual variability in performance, and physiological and perceptual response were present despite the use of threshold-based prescription.
The present study suggests that threshold-based prescription may help standardize the mean response exercise across sexes but does not eliminate physiological or perceptual variability. Furthermore, the lack of sex differences in TTF was accompanied by greater %deoxy[haem] in males, indicating tissue oxygenation is an unlikely determinant of HIIT performance. This study has been retrospectively registered at Trial Registration https://doi.org/10.17605/OSF.IO/KZVGC January 17th, 2023, following data collection but prior to data analyses.
本研究的目的是检验以下假设：对最大摄氧量（VO₂max）（毫升/千克去脂体重/分钟）匹配的男性和女性，采用基于阈值的高强度间歇训练（HIIT），规定强度高于临界功率（CP），疲劳时间不会存在性别差异。
13名男性（平均±标准差：22.0±2.48岁，181±8.36厘米，78.8±11.4千克）和11名女性（平均±标准差：22.4±2.69岁，170±5.73厘米，65.2±7.66千克）最初进行递增运动至力竭测试以确定VO₂max，并进行CP测试。然后，以与105%CP相关的工作强度进行一次HIIT训练（4分钟运动，2分钟休息）直至力竭。记录急性生理和心血管反应。
疲劳时间[女性与男性（分钟）：36.0±18.5与39.3±16.3]、心率、主观用力程度或氧合血红蛋白（[血红蛋白]）百分比方面未记录到性别差异。在第1、2、3和4个间歇结束时，女性的脱氧血红蛋白（[血红蛋白]）百分比更低[女性与男性（%）：89.4±21.2与110±27.3，92.0±21.5与115±27.6，87.1±23.7与112±22.8，88.9±26.3与113±23.5]。尽管采用基于阈值的处方，但在运动表现、生理和感知反应方面仍存在较大的个体间差异。
本研究表明，基于阈值的处方可能有助于使不同性别的平均运动反应标准化，但不能消除生理或感知方面的变异性。此外，男性在TTF方面缺乏性别差异，但脱氧血红蛋白（[血红蛋白]）百分比更高，这表明组织氧合不太可能是HIIT表现的决定因素。本研究在数据收集之后但在数据分析之前，于2023年1月17日在试验注册网站https://doi.org/10.17605/OSF.IO/KZVGC进行了回顾性注册。
