@Article{Vasquez Bonilla2023,
journal="Biology of Sport",
issn="0860-021X",
volume="40",
number="2",
year="2023",
title="Training zones through muscle oxygen saturation during a graded exercise test in cyclists and triathletes",
abstract="Use of muscle oxygen saturation (SmO2) has been validated as a performance factor during  incremental exercise with portable near-infrared stereoscopy (NIRS) technology. However, there is little knowledge  about the use of SmO2 to identify training zones. The objective of this study was to evaluate the metabolic  zones by SmO2: maximum lipid oxidation zone (Fatmax), ventilatory thresholds (VT1 and VT2) and maximum  aerobic power (MAP) during a graded exercise test (GXT). Forty trained cyclists and triathletes performed a GXT.  Output power (W), heart rate (HR), oxygen consumption (VO2), energy expenditure (kcal/min) and SmO2 were  measured. Data were analysed using the ANOVA test, ROC curves and multiple linear regressions. Significance  was established at p ≤ 0.05. SmO2 decreases were observed from baseline (LB) to Fatmax (Δ = -16% p < 0.05),  Fatmax to VT1 (Δ = -16% p < 0.05) and VT1 to VT2 (Δ = -45% p < 0.01). Furthermore, SmO2 together with  weight, HR and output power have the ability to predict VO2 and energy expenditure by 89% and 90%,  respectively. We conclude that VO2 and energy expenditure values can be approximated using SmO2 together  with other physiological parameters and SmO2 measurements can be a complementary parameter to discriminate  aerobic workload and anaerobic workload in athletes.",
author="Vasquez Bonilla, Aldo
and González-Custodio, Adrián
and Timón, Rafael
and Cardenosa, Alba
and Camacho-Cardenosa, Marta
and Olcina, Guillermo",
pages="439--448",
doi="10.5114/biolsport.2023.114288",
url="http://dx.doi.org/10.5114/biolsport.2023.114288"
}