Side differences and reproducibility of the Moxy muscle oximeter during cycling in trained men.

Autor: Skotzke P; Institute of Sport and Preventive Medicine, University of Saarland, Campus B8.2, 66123, Saarbrücken, Germany. s8phskot@uni-saarland.de., Schwindling S; Institute of Sport and Preventive Medicine, University of Saarland, Campus B8.2, 66123, Saarbrücken, Germany., Meyer T; Institute of Sport and Preventive Medicine, University of Saarland, Campus B8.2, 66123, Saarbrücken, Germany.
Jazyk: angličtina
Zdroj: European journal of applied physiology [Eur J Appl Physiol] 2024 Oct; Vol. 124 (10), pp. 3075-3083. Date of Electronic Publication: 2024 May 29.
DOI: 10.1007/s00421-024-05514-2
Abstrakt: Purpose: Portable near-infrared spectroscopy devices allow measurements of muscle oxygen saturation (SmO 2 ) in real time and non-invasively. To use NIRS for typical applications including intensity control and load monitoring, the day-to-day variability needs to be known to interpret changes confidently. This study investigates the absolute and relative test-retest reliability of the Moxy Monitor and investigates side differences of SmO 2 at the vastus lateralis muscle of both legs in cyclists.
Methods: Twelve trained cyclists and triathletes completed 3 incremental step tests with 5 min step duration starting at 1.0 W/kg with an increase of 0.5 W/kg separated by 2-7 days. SmO 2 was averaged over the last minute of each stage. For all power outputs, the intra-class coefficient (ICC), the standard error of measurement (SEM) and the minimal detectable change (MDC) were calculated. Dominant and non-dominant leg SmO 2 were compared using a three-factor ANOVA and limits of agreement (LoA).
Results: ANOVA showed no significant systematic differences between trials and side. For both legs and all intensities, the ICC ranged from 0.79 to 0.92, the SEM from 5 to 9% SmO 2 and the MDC from 14 to 18% SmO 2 . The bias and LoA between both legs were -2.0% ± 19.9% SmO 2 .
Conclusion: Relative reliability of SmO 2 was numerically good to excellent according to current standards. However, it depends on the specific analytical goal whether the test-retest reliability is deemed sufficient. Wide LoA indicate side differences in muscle oxygenation during exercise unexplained by leg dominance.
(© 2024. The Author(s).)
Databáze: MEDLINE
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