@article{uneatlantico7167,
           month = {Mayo},
            year = {2023},
          volume = {14},
          author = {Florent Osmani and Carlos Lago-Fuentes and Josep Alemany Iturriaga and Mart{\'i}n Barcala Furelos},
         journal = {Frontiers in Physiology},
           title = {The relationship of muscle oxygen saturation analyzer with other monitoring and quantification tools in a maximal incremental treadmill test},
        abstract = {Introduction: The study aims to explore whether NIRS derived data can be used to identify the second ventilatory threshold (VT2) during a maximal incremental treadmill test in non-professional runners and to determine if there is a correlation between SmO2 and other valid and reliable exercise performance assessment measures or parameters for maximal incremental test, such as lactate concentration (LT), RPE, HR, and running power (W).

Methods: 24 participants were recruited for the study (5 women and 19 men). The devices used consisted of the following: i) a muscle oxygen saturation analyzer placed on the vastus lateralis of the right leg, ii) the Stryd power meter for running, iii) the Polar H7 heart rate band; and iv) the lactate analyzer. In addition, a subjective perceived exertion scale (RPE 1-10) was used. All of the previously mentioned devices were used in a maximal incremental treadmill test, which began at a speed of 8 km/h with a 1\% slope and a speed increase of 1.2 km/h every 3 min. This was followed by a 30-s break to collect the lactate data between each 3-min stage. Spearman correlation was carried out and the level of significance was set at p {\ensuremath{<}} 0.05.

Results: The VT2 was observed at 87,41 {$\pm$} 6,47\% of the maximal aerobic speed (MAS) of each participant. No relationship between lactate data and SmO2 values (p = 0.076; r = ?0.156) at the VT2 were found. No significant correlations were found between the SmO2 variables and the other variables (p {\ensuremath{>}} 0.05), but a high level of significance and strong correlations were found between all the following variables: power data (W), heart rate (HR), lactate concentration (LT) and RPE (p {\ensuremath{<}} 0.05; r {\ensuremath{>}} 0.5).

Discussion: SmO2 data alone were not enough to determine the VT2, and there were no significant correlations between SmO2 and the other studied variables during the maximal incremental treadmill test. Only 8 subjects had a breakpoint at the VT2 determined by lactate data.

Conclusion: The NIRS tool, Humon Hex, does not seem to be useful in determining VT2 and it does not correlate with the other variables in a maximal incremental treadmill test.},
             url = {http://repositorio.uneatlantico.es/id/eprint/7167/},
        keywords = {heart rate, lactate, NIRS, power meter, RPE}
}