Browsing by Author "Reid, W. Darlene"
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- ItemEffectiveness of respiratory muscles training by voluntary isocapnic hyperpnea versus inspiratory threshold loading on intercostales and vastus lateralis muscles deoxygenation induced by exercise in physically active adults(2023) Espinosa Ramírez, Maximiliano; Riquelme Sánchez, Santiago; Araya, Felipe; Rodríguez, Guido; Figueroa Martínez, Fernanda; Gabrielli, Luigi; Viscor, Ginés; Reid, W. Darlene; Contreras-Briceño, Felipe; Pontificia Universidad Católica de Chile. Escuela de MedicinaTesis conducente al grado de Magíster en Investigación en Ciencias de la Salud. Abstract: Respiratory muscle training (RMT) improves physical performance, although it is still debated whether this effect depends on the type of training. The purpose of this study was to compare the effects of two different types of RMT, i.e., voluntary isocapnic hyperpnea (VIH) and inspiratory threshold loading (ITL), on the deoxygenation of intercostal (∆SmO2-m. intercostales) and vastus lateralis (∆SmO2-m. vastus lateralis) muscles during exercise. Twenty-four participants performed eight weeks of RMT by: (i) VIH (3 days·week−1 for 12 min at 60% maximal voluntary ventilation) or (ii) ITL (5 sets·week−1 of 30 breaths·minute−1 at 60% maximal inspiratory pressure). Cardiopulmonary exercise testing (CPET) included ∆SmO2 (the change from baseline to end of test) of intercostal and vastus lateralis muscles. After RMT, both groups showed decreased ∆SmO2-m. intercostales (VIH = 12.8 ± 14.6%, p = 0.04 (effect size, ES = 0.59), and ITL = 8.4 ± 9.8%, p = 0.04 (ES = 0.48)), without a coincident change of ∆SmO2-m. vastus lateralis. ITL training induced higher VO2-peak absolute values than VIH (mean ∆ post–pre, ITL = 229 ± 254 mL·min−1 [95% CI 67–391] vs. VIH, 39 ± 153 mL·min−1 [95% CI −58–136.0], p = 0.01). In conclusion, both RMT improved the balance between supply and oxygen consumption levels of m. intercostales during CPET, with ITL also inducing an increase of aerobic capacity.
- ItemSex-Differences in the Oxygenation Levels of Intercostal and Vastus Lateralis Muscles During Incremental Exercise(Wiley, 2021) Espinosa Ramírez, Maximiliano; Moya Gallardo, Eduardo; Araya Roman, Felipe; Riquelme Sanchez, Santiago; Rodriguez Garcia, Guido; Reid, W. Darlene; Viscor, Gines; Araneda, Oscar F.; Gabrielli, Luigi; Contreras Briceño, FelipeThis 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.