Murdoch University.
The University of Western Australia.
Res Q Exerc Sport. 2024 Mar;95(1):235-242. doi: 10.1080/02701367.2023.2193232. Epub 2023 Apr 11.
To determine whether performing resistance exercise in hypoxia acutely reduces performance and increases markers of fatigue, and whether these responses are exaggerated if exercising at high low work rates (i.e., exercising to failure or volume matched non-failure). Following a within-subject design, 20 men completed two trials in hypoxia (13% oxygen) and two in normoxia (21% oxygen). The first session for hypoxic and normoxic conditions comprised six sets of bench press and shoulder press to failure (high work rate), while subsequent sessions involved the same volume distributed over 12 sets (low work rate). Physical performance (concentric velocity) and perceptual responses were measured during exercise and for 72 hr post-exercise. Neuromuscular performance (bench throw velocity) was assessed pre- and post-session. Hypoxia did not affect physical performance, neuromuscular performance, and perceptual recovery when exercising at high or low work rates. Higher work rate exercise caused greater acute decrements in physical performance and post-exercise neuromuscular performance and increased perceived exertion and muscle soreness ( ≤ 0.006), irrespective of hypoxia. Hypoxia does not impact on resistance exercise performance or increase markers of physical and perceptual fatigue. Higher exercise work rates may impair physical performance, and exaggerate fatigue compared to low work rate exercise, irrespective of environmental condition. Practitioners can prescribe hypoxic resistance exercise without compromising physical performance or inducing greater levels of fatigue. For athletes who are required to train with high frequency, decreasing exercise work rate may reduce post-exercise markers of fatigue for the same training volume.
为了确定在低氧环境下进行抗阻运动是否会急性降低运动表现并增加疲劳标志物，以及如果以高（低）工作率（即运动至力竭或与力竭相匹配的容量）进行运动，这些反应是否会被夸大。在一项自身对照设计中，20 名男性在低氧（13%氧气）和常氧（21%氧气）条件下各完成两项试验。低氧和常氧条件下的第一次试验包括 6 组卧推和肩推至力竭（高工作率），而随后的试验则涉及相同的容量分布在 12 组（低工作率）。在运动过程中和运动后 72 小时内测量了身体表现（向心速度）和知觉反应。在试验前和试验后评估了神经肌肉表现（卧推速度）。 当以高或低工作率运动时，低氧不会影响身体表现、神经肌肉表现和知觉恢复。高工作率运动导致身体表现和运动后神经肌肉表现的急性下降更大，并增加了感知的用力和肌肉酸痛（≤0.006），与低氧无关。 低氧不会影响抗阻运动表现或增加身体和知觉疲劳标志物。与低工作率运动相比，高工作率运动可能会损害身体表现，并使疲劳加剧，无论环境条件如何。从业者可以在不影响身体表现或不引起更高水平疲劳的情况下，规定低氧抗阻运动。对于需要高频训练的运动员，降低运动工作率可能会减少相同训练量后的疲劳标志物。
