Central and peripheral nervous system activity and muscle oxygenation in athletes during repeated-sprint exercise in normoxia and normobaric hypoxia.

IF 2.3 2区医学 Q2 SPORT SCIENCES

Journal of Sports Sciences Pub Date : 2025-02-06 DOI:10.1080/02640414.2025.2461947

Charles W C Simpson, Julia Walter, Steven P Gieseg, Sonja Lackner, Sandra Holasek, Michael J Hamlin

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Abstract

Aim: To investigate central and peripheral nervous system activity and muscle oxygenation in athletes during repeated-sprint exercise in normoxia and normobaric hypoxia.

Methods: The effects on vastus lateralis muscle strength in a cross-over study were examined in 18 athletes (13 males, 5 females) completing 10 × 6-s cycle sprints. Immediately after and again 5 minutes post-exercise, electromyography (EMG), heart rate variability, maximal voluntary contraction (MVC), muscle oxygenation, peak power output, and arterial oxygen saturation were compared to 2 baseline sets named ("Baseline" and "Pre").

Results: Post-exercise MVC was significantly lower (6.7 ± 10.0%) than Baseline, but root-mean-square amplitude during hypoxia (all-times) was significantly lower than normoxia (0.38 ± 0.19 vs 0.41 ± 0.17 mV). Comparative frequency analysis of the percentage change in pre- to post-exercise EMG area, at low 1-29 hz (type-1 fibre) and high 75-100 hz (type-2 fibre) areas, revealed a significant reduction in type-1 fibre activity relative to type-2, by 20-30% across time and by 10% in type-1 activity between conditions.

Conclusion: Exercise in hypoxia appeared to cause a temporary increase in central sympathetic nervous system activity and greater recruitment of type-2 muscle fibres, with accompanying reduction in type-1. Acute hypoxia may stimulate type-2 fibre conditioning.

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常氧和常压低氧条件下重复短跑运动中运动员的中枢和周围神经系统活动和肌肉氧合。

目的：探讨运动员在常氧和常压低氧条件下重复短跑运动中中枢和周围神经系统的活动和肌肉氧合情况。方法：对18名（男13名，女5名）完成10 × 6-s循环短跑的运动员进行交叉训练，观察其对股外侧肌力量的影响。运动后和运动后5分钟，分别将肌电图（EMG）、心率变异性、最大自主收缩（MVC）、肌肉氧合、峰值功率输出和动脉氧饱和度与2组基线（“基线”和“前”）进行比较。结果：运动后的MVC显著低于基线（6.7±10.0%），但缺氧时（所有时间）的均方根振幅显著低于缺氧时（0.38±0.19 vs 0.41±0.17 mV）。对比频率分析运动前和运动后肌电图区域的百分比变化，低1-29 hz（1型纤维）和高75-100 hz（2型纤维）区域，显示1型纤维活动相对于2型显著减少，在时间上减少了20-30%，在不同条件下1型活动减少了10%。结论：在缺氧情况下运动似乎会导致中枢交感神经系统活动的暂时增加和2型肌纤维的更多募集，同时伴有1型肌纤维的减少。急性缺氧可刺激2型纤维调节。

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

Journal of Sports Sciences 社会科学-运动科学

CiteScore

6.30

自引率

2.90%

发文量

147

审稿时长

12 months

期刊介绍： The Journal of Sports Sciences has an international reputation for publishing articles of a high standard and is both Medline and Clarivate Analytics-listed. It publishes research on various aspects of the sports and exercise sciences, including anatomy, biochemistry, biomechanics, performance analysis, physiology, psychology, sports medicine and health, as well as coaching and talent identification, kinanthropometry and other interdisciplinary perspectives. The emphasis of the Journal is on the human sciences, broadly defined and applied to sport and exercise. Besides experimental work in human responses to exercise, the subjects covered will include human responses to technologies such as the design of sports equipment and playing facilities, research in training, selection, performance prediction or modification, and stress reduction or manifestation. Manuscripts considered for publication include those dealing with original investigations of exercise, validation of technological innovations in sport or comprehensive reviews of topics relevant to the scientific study of sport.