Sex-Differences in the Oxygenation Levels of Intercostal and Vastus Lateralis Muscles During Incremental Exercise

Espinosa-Ramirez, Maximiliano; Moya-Gallardo, Eduardo; Araya-Roman, Felipe; Riquelme-Sanchez, Santiago; Rodriguez-Garcia, Guido; Reid, W. Darlene; Viscor, Gines; Araneda, Oscar F.; Gabrielli, Luigi; Contreras-Briceno, Felipe

Abstract

This study aimed to examine sex differences in oxygen saturation in respiratory (SmO2-m.intercostales) and locomotor muscles (SmO2-m.vastus lateralis) while performing physical exercise. Twenty-five (12 women) healthy and physically active participants were evaluated during an incremental test with a cycle ergometer, while ventilatory variables [lung ventilation (V.E), tidal volume (Vt), and respiratory rate (RR)] were acquired through the breath-by-breath method. SmO2 was acquired using the MOXY(R) devices on the m.intercostales and m.vastus lateralis. A two-way ANOVA (sex x time) indicated that women showed a greater significant decrease of SmO2-m.intercostales, and men showed a greater significant decrease of SmO2-m.vastus lateralis. Additionally, women reached a higher level of Delta SmO2-m.intercostales normalized to V.E (L.min(-1)) (p 0.001), whereas men had a higher level of Delta SmO2-m.vastus lateralis normalized to peak workload-to-weight (watts.kg(-1), PtW) (p = 0.049), as confirmed by Student's t-test. During an incremental physical exercise, women experienced a greater cost of breathing, reflected by greater deoxygenation of the respiratory muscles, whereas men had a higher peripheral load, indicated by greater deoxygenation of the locomotor muscles.

Más información

Título según WOS: Sex-Differences in the Oxygenation Levels of Intercostal and Vastus Lateralis Muscles During Incremental Exercise
Título de la Revista: FRONTIERS IN PHYSIOLOGY
Volumen: 12
Editorial: FRONTIERS MEDIA SA
Fecha de publicación: 2021
Notas: ISI