Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Intercostal Muscles Oxygenation and Breathing Pattern during Exercise in Competitive Marathon Runners

Felipe Contreras-Briceño
* ORCID logo ,
Maximiliano Espinosa-Ramírez
,
Eduardo Moya-Gallardo
,
Rodrigo Fuentes-Kloss
,
Luigi Gabrielli
ORCID logo ,
Oscar Araneda
,
Ginés Viscor
Version 1 : Received: 24 June 2021 / Approved: 28 June 2021 / Online: 28 June 2021 (09:44:55 CEST)

A peer-reviewed article of this Preprint also exists.

Contreras-Briceño, F.; Espinosa-Ramírez, M.; Moya-Gallardo, E.; Fuentes-Kloss, R.; Gabrielli, L.; Araneda, O.F.; Viscor, G. Intercostal Muscles Oxygenation and Breathing Pattern during Exercise in Competitive Marathon Runners. Int. J. Environ. Res. Public Health 2021, 18, 8287. Contreras-Briceño, F.; Espinosa-Ramírez, M.; Moya-Gallardo, E.; Fuentes-Kloss, R.; Gabrielli, L.; Araneda, O.F.; Viscor, G. Intercostal Muscles Oxygenation and Breathing Pattern during Exercise in Competitive Marathon Runners. Int. J. Environ. Res. Public Health 2021, 18, 8287.

Abstract

The study aimed to evaluate the association between the changes in ventilatory variables (tidal volume (Vt), respiratory rate (RR), and lung ventilation (VE)) and deoxygenation of m.intescostales (∆SmO2-m.intercostales) during a maximal incremental exercise in nineteen male competitive marathon runners. The ventilatory variables and oxygen-consumption (VO2) were recorded breath-by-breath by exhaled gas analysis. A near-infrared spectroscopy device (MOXY) located in the right-hemithorax allowed recording SmO2-m.intercostales. To explore changes in oxygen levels in muscles with high demand during exercise, a second MOXY records SmO2-m.vastus laterallis. The triphasic model of exercise intensity was used for evaluating changes in SmO2 in both muscle groups. We found that ∆SmO2-m.intercostales correlated with VO2-peak (r=0.65; p=0.002) and the increase of VE (r=0.78; p=0.001), RR (r=0.54; p=0.001), but not Vt (p=0.210). The interaction of factors (muscles X exercise-phases) in SmO2 expressed as an arbitrary unit (a.u) was significant (p=0.005). At VT1 were no difference (p=0.177), but SmO2-m.intercostales was higher at VT1 (p<0.001) and VO2-peak (p<0.001). In competitive marathon runners, the m.intercostales deoxygenation during incremental exercise is directly associated with the aerobic capacity and increased lung ventilation and respiratory rate, but not tidal volume. Besides, it shows less deoxygenation than m.vastus laterallis at intensities above the aerobic ventilatory threshold.

Keywords

Exercise; Runners; Near-infrared spectroscopy; Respiratory muscles; Respiration.

Subject

Medicine and Pharmacology, Immunology and Allergy

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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