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

Felipe Contreras-Briceño, Maximiliano Espinosa-Ramírez, Eduardo Moya-Gallardo, Rodrigo Fuentes-Kloss, Luigi Gabrielli, Oscar F. Araneda and Ginés Viscor
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Felipe Contreras-Briceño: Laboratory of Exercise Physiology, Department of Health Science, Faculty of Medicine, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Santiago 7820436, Chile
Maximiliano Espinosa-Ramírez: Laboratory of Exercise Physiology, Department of Health Science, Faculty of Medicine, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Santiago 7820436, Chile
Eduardo Moya-Gallardo: Laboratory of Exercise Physiology, Department of Health Science, Faculty of Medicine, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Santiago 7820436, Chile
Rodrigo Fuentes-Kloss: Laboratory of Exercise Physiology, Department of Health Science, Faculty of Medicine, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Santiago 7820436, Chile
Luigi Gabrielli: Laboratory of Exercise Physiology, Department of Health Science, Faculty of Medicine, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Santiago 7820436, Chile
Oscar F. Araneda: Laboratory of Integrative Physiology of Biomechanics and Physiology of Effort (LIBFE), Kinesiology School, Faculty of Medicine, Universidad de los Andes, Av. Monseñor Alvaro del Portillo 12455, Santiago 7620001, Chile
Ginés Viscor: Physiology Section, Department of Cell Biology, Physiology and Immunology, Faculty of Biology, Universitat de Barcelona, Av. Diagonal 643, 08028 Barcelona, Spain

IJERPH, 2021, vol. 18, issue 16, 1-12

Abstract: The study aimed to evaluate the association between the changes in ventilatory variables (tidal volume (Vt), respiratory rate (RR) and lung ventilation ( V . E)) and deoxygenation of m.intescostales (?SmO 2 - m.intercostales ) during a maximal incremental exercise in 19 male high-level competitive marathon runners. The ventilatory variables and oxygen consumption ( V . O 2 ) were recorded breath-by-breath by exhaled gas analysis. A near-infrared spectroscopy device (MOXY ® ) located in the right-hemithorax allowed the recording of SmO 2 - m.intercostales . To explore changes in oxygen levels in muscles with high demand during exercise, a second MOXY ® records SmO 2 - m.vastus laterallis . The triphasic model of exercise intensity was used for evaluating changes in SmO 2 in both muscle groups. We found that ?SmO 2 - m.intercostales correlated with V . O 2-peak (r = 0.65; p = 0.002) and the increase of V . E (r = 0.78; p = 0.001), RR (r = 0.54; p = 0.001), but not Vt ( p = 0.210). The interaction of factors (muscles × exercise-phases) in SmO 2 expressed as an arbitrary unit (a.u) was significant ( p = 0.005). At VT1 there was no difference ( p = 0.177), but SmO 2 - m.intercostales was higher at VT2 ( p < 0.001) and V . O 2-peak ( p < 0.001). In high-level 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. Moreover, it shows less deoxygenation than m.vastus laterallis at intensities above the aerobic ventilatory threshold.

Keywords: exercise; runners; near-infrared spectroscopy; respiratory muscles; respiration (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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