Breathing variability during running in athletes: The role of sex, exercise intensity and breathing reserve.

Autor: Lopes TR; Laboratory of Exercise Physiology at Olympic Center of Training and Research, Department of Physiology, Federal University of São Paulo, São Paulo, SP, Brazil; São Paulo Association for Medicine Development, São Paulo, Sp, Brazil; Post-graduate Program in Translational Medicine, Department of Medicine, Paulista School of Medicine, Federal University of São Paulo, São Paulo, SP, Brazil., de Oliveira DM; Laboratory of Exercise Physiology at Olympic Center of Training and Research, Department of Physiology, Federal University of São Paulo, São Paulo, SP, Brazil; Post-graduate Program in Translational Medicine, Department of Medicine, Paulista School of Medicine, Federal University of São Paulo, São Paulo, SP, Brazil., Amoroso de Lima LA; Laboratory of Exercise Physiology at Olympic Center of Training and Research, Department of Physiology, Federal University of São Paulo, São Paulo, SP, Brazil; Post-graduate Program in Translational Medicine, Department of Medicine, Paulista School of Medicine, Federal University of São Paulo, São Paulo, SP, Brazil., Silva BM; Laboratory of Exercise Physiology at Olympic Center of Training and Research, Department of Physiology, Federal University of São Paulo, São Paulo, SP, Brazil; Post-graduate Program in Translational Medicine, Department of Medicine, Paulista School of Medicine, Federal University of São Paulo, São Paulo, SP, Brazil. Electronic address: silva.bruno@unifesp.br.
Jazyk: angličtina
Zdroj: Respiratory physiology & neurobiology [Respir Physiol Neurobiol] 2024 Sep 11; Vol. 331, pp. 104350. Date of Electronic Publication: 2024 Sep 11.
DOI: 10.1016/j.resp.2024.104350
Abstrakt: Highly trained aerobic athletes progressively use most of their breathing reserve with increased exercise intensity during whole-body exercise. Additionally, females typically present proportionally smaller lungs than males. Therefore, sex, exercise intensity, and breathing reserve use likely influence the volume and time in which respiratory parameters vary between consecutive breaths during whole-body exercise. However, breath-by-breath variability has been scarcely investigated during exercise. Accordingly, we sought to investigate breath-by-breath pulmonary ventilation (V̇ E ), tidal volume ( V T ), and respiratory frequency (f R ) variability during a maximal treadmill incremental exercise test in 17 females and 18 males highly trained professional endurance runners. The breath-by-breath variability was analyzed by root mean square of successive differences (RMSSD) within 1-minute windows. Females had lower absolute and percent predicted forced expiratory volume in one second (FEV 1 ) and forced vital capacity (FVC) than males, as well as lower height-adjusted absolute FVC than males. V̇ E and V T reserve use were similar between the sexes at peak exercise. While RMSSDV̇ E and RMSSDf R did not change over exercise (P > 0.05), RMSSDV T progressively decreased (P < 0.001). RMSSDV T was negatively correlated with V T reserve use only in males. Females showed lower RMSSDV̇ E than males during the entire exercise test (P < 0.001). At iso-V̇ E reserve use, between-sex differences in RMSSDV̇ E persisted (P = 0.003). Our findings indicate that exercise intensity decreases V T variability in professional runners, which is linked to V T reserve use in males but not females. Additionally, the female sex lowers V̇ E variability regardless of exercise intensity and V̇ E reserve use.
(Copyright © 2024. Published by Elsevier B.V.)
Databáze: MEDLINE
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