Effects of Pre-Exercise Voluntary Hyperventilation on Metabolic and Cardiovascular Responses During and After Intense Exercise.

IF 1.4 4区 教育学 Q3 HOSPITALITY, LEISURE, SPORT & TOURISM
Kohei Dobashi, Masashi Ichinose, Naoto Fujii, Tomomi Fujimoto, Takeshi Nishiyasu
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引用次数: 0

Abstract

Purpose: We investigated the effects of pre-exercise voluntary hyperventilation and the resultant hypocapnia on metabolic and cardiovascular responses during and after high-intensity exercise. Methods: Ten healthy participants performed a 60-s cycling exercise at a workload of 120% peak oxygen uptake in control (spontaneous breathing), hypocapnia and normocapnia trials. Hypocapnia was induced through 20-min pre-exercise voluntary hyperventilation. In the normocapnia trial, voluntary hyperpnea was performed with CO2 inhalation to prevent hypocapnia. Results: Pre-exercise end-tidal CO2 partial pressure was lower in the hypocapnia trial than the control or normocapnia trial, with similar levels in the control and normocapnia trials. Average V˙O2 during the entire exercise was lower in both the hypocapnia and normocapnia trials than in the control trial (1491 ± 252vs.1662 ± 169vs.1806 ± 149 mL min-1), with the hypocapnia trial exhibiting a greater reduction than the normocapnia trial. Minute ventilation during exercise was lower in the hypocapnia trial than the normocapnia trial. In addition, minute ventilation during the first 10s of the exercise was lower in the normocapnia than the control trial. Pre-exercise hypocapnia also reduced heart rates and arterial blood pressures during the exercise relative to the normocapnia trial, a response that lasted through the subsequent early recovery periods, though end-tidal CO2 partial pressure was similar in the two trials. Conclusions: Our results suggest that pre-exercise hyperpnea and the resultant hypocapnia reduce V˙O2 during high-intensity exercise. Moreover, hypocapnia may contribute to voluntary hyperventilation-mediated cardiovascular responses during the exercise, and this response can persist into the subsequent recovery period, despite the return of arterial CO2 pressure to the normocapnic level.

运动前自主过度通气对剧烈运动期间和运动后代谢和心血管反应的影响。
目的:研究运动前自主过度通气和由此引起的低碳酸血症对高强度运动期间和运动后代谢和心血管反应的影响。方法:10名健康参与者在控制(自主呼吸)、低碳酸血症和正常碳酸血症试验中,在120%峰值摄氧量的负荷下进行60秒的自行车运动。通过运动前20分钟自愿过度通气诱导低碳酸血症。在正常碳酸血症试验中,自愿呼吸过度并吸入二氧化碳以防止低碳酸血症。结果:低碳酸血症试验中运动前潮末CO2分压低于对照组或正常碳酸血症试验,对照组和正常碳酸血症试验的水平相似。低碳酸血症组和正常碳酸血症组在整个运动过程中的平均V˙O2均低于对照组(1491±252vs)。1662±169vs。1806±149 mL min-1),低碳酸血症试验比正常碳酸血症试验表现出更大的降低。低碳酸血症组运动时的分钟通气量低于正常碳酸血症组。此外,在运动前10秒的分钟通气量低于对照试验。与正常碳酸血症试验相比,运动前低碳酸血症也降低了运动期间的心率和动脉血压,这种反应持续到随后的早期恢复期,尽管两项试验的潮末二氧化碳分压相似。结论:我们的研究结果表明,运动前呼吸急促和由此引起的低碳酸血症会降低高强度运动时的V˙O2。此外,低碳酸血症可能在运动过程中促进自主过度通气介导的心血管反应,并且这种反应可以持续到随后的恢复期,尽管动脉CO2压恢复到正碳酸水平。
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
4.30
自引率
0.00%
发文量
125
审稿时长
6-12 weeks
期刊介绍: Research Quarterly for Exercise and Sport publishes research in the art and science of human movement that contributes significantly to the knowledge base of the field as new information, reviews, substantiation or contradiction of previous findings, development of theory, or as application of new or improved techniques. The goals of RQES are to provide a scholarly outlet for knowledge that: (a) contributes to the study of human movement, particularly its cross-disciplinary and interdisciplinary nature; (b) impacts theory and practice regarding human movement; (c) stimulates research about human movement; and (d) provides theoretical reviews and tutorials related to the study of human movement. The editorial board, associate editors, and external reviewers assist the editor-in-chief. Qualified reviewers in the appropriate subdisciplines review manuscripts deemed suitable. Authors are usually advised of the decision on their papers within 75–90 days.
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