Muscle Mitochondrial Capacity Is Impaired Immediately Following Maximal Exercise.

IF 4.1 2区 医学 Q1 SPORT SCIENCES
Callie G Dickinson, Kristin M Mendez, Makayla D Holyfield, Nicholas T Batchelor, Kevin K McCully
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Abstract

Purpose: This study measured the time course mV̇O 2 max following both maximal and submaximal exercise.

Methods: Healthy male and female participants were tested ( n = 12 maximal and n = 8 submaximal exercise). A NIRS device was placed on the left medial gastrocnemius. Participants performed either 1 min of maximal, rapid (~2 Hz), or submaximal (~0.37 Hz) plantar flexion exercise on a custom pneumatic ergometer. mV̇O 2 max was measured before and immediately after exercise. mV̇O 2 max measurements consisted of four incomplete recovery curves of muscle metabolism taken after 30 s of electrical muscle stimulation except in the first post-exercise to be consistent with the use of pre-exercise trial. The four recovery curves were collected 50-, 156-, 260-, and 366-s postexercise, each producing an mV̇O 2 max rate constant.

Results: After maximal exercise, muscle acceleration decreased to 52 ± 18% ( P = 0.001) of prevalues. mV̇O 2 max was reduced from the pre-exercise mean at the first post-trial (2.16 ± 0.44 to 1.21 ± 0.52 min -1 , P < 0.001). The fourth trial showed recovery from the first (2.2 ± 0.46 min -1 vs 1.21 ± 0.52 min -1 , P < 0.001) and was not significantly different from pre-exercise values (2.2 ± 0.46 vs 2.16 ± 0.44 min -1 , P = 0.41). No change in acceleration or mV̇O 2 max was seen after submaximal exercise ( P > 0.05).

Conclusions: The 56.7% reduction in mV̇O 2 max supports the hypothesis that in young, healthy individuals, a minute of maximal exercise transiently impairs mV̇O 2 max, which then recovers within 6 min. The NIRS method shows promise in tracking time course changes in mV̇O 2 max and warrants further investigation of the transient effects of exercise on mV̇O 2 max.

肌肉线粒体容量在最大运动后立即受损。
目的:本研究测量了最大和次最大运动后 mVO2max 的时程。方法:对健康的男性和女性参与者进行了测试(最大运动人数为 12 人,次最大运动人数为 8 人)。在左侧腓肠肌内侧放置了一个近红外装置。参与者在定制的气动测力计上进行一分钟的最大、快速(~2 Hz)或次最大(~0.37 Hz)跖屈运动,运动前和运动后立即测量 mVO2max。四条恢复曲线分别在运动后 50 秒、156 秒、260 秒和 366 秒采集,每条曲线都产生一个 mVO2max 速率常数:最大运动后,肌肉加速度降至运动前的 52 + 18% (p = 0.001)。在运动后的第一次试验中,mVO2max 从运动前的平均值降低(2.16 + 0.44 min-1 降至 1.21 + 0.52 min-1,p < 0.001)。第四次试验与第一次试验相比有所恢复(2.2 + 0.46 min-1 vs 1.21 + 0.52 min-1,p < 0.001),与运动前的数值没有显著差异(2.2 + 0.46 min-1 vs 2.16 + 0.44 min-1,p = 0.41)。亚极限运动后,加速度或 mVO2max 均无变化(p > 0.05):mVO2max降低了56.7%,这支持了一个假设,即在年轻、健康的个体中,一分钟的最大运动会短暂损害mVO2max,然后在六分钟内恢复。近红外光谱法有望跟踪 mVO2max 的时程变化,值得进一步研究运动对 mVO2max 的短暂影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.70
自引率
4.90%
发文量
2568
审稿时长
1 months
期刊介绍: Medicine & Science in Sports & Exercise® features original investigations, clinical studies, and comprehensive reviews on current topics in sports medicine and exercise science. With this leading multidisciplinary journal, exercise physiologists, physiatrists, physical therapists, team physicians, and athletic trainers get a vital exchange of information from basic and applied science, medicine, education, and allied health fields.
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