Abstract
Introduction
Monitoring muscle metabolic activity via blood lactate is a useful tool for understanding the physiological response to a given exercise intensity. Recent indications suggest that skeletal muscle oxygen saturation (SmO2), an index of the balance between local O2 supply and demand, may describe and predict endurance performance outcomes.
Purpose
We tested the hypothesis that SmO2 rate is tightly related to blood lactate concentration across exercise intensities, and that deflections in SmO2 rate would coincide with established blood lactate thresholds (i.e., lactate thresholds 1 and 2).
Methods
Ten elite male soccer players completed an incremental running protocol to exhaustion using 3-min work to 30 s rest intervals. Blood lactate samples were collected during rest and SmO2 was collected continuously via near-infrared spectroscopy from the right and left vastus lateralis, left biceps femoris and the left gastrocnemius.
Results
Muscle O2 saturation rate (%/min) was quantified after the initial 60 s of each 3-min segment. The SmO2 rate was significantly correlated with blood lactate concentrations for all muscle sites; RVL, r = − 0.974; LVL, r = − 0.969; LG, r = − 0.942; LHAM, r = − 0.907. Breakpoints in SmO2 rate were not significantly different from LT1 or LT2 at any muscle sites (P > 0.05). Bland–Altman analysis showed speed threshold estimates via SmO2 rate and lactate are similar at LT2, but slightly greater for SmO2 rate at LT1.
Conclusions
Muscle O2 saturation rate appears to provide actionable information about maximal metabolic steady state and is consistent with bioenergetic reliance on oxygen and its involvement in the attainment of metabolic steady state.
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Data availability
The authors confirm that the data supporting the findings of this study are available within the article and will be made available from the corresponding author on reasonable request.
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Acknowledgements
We would like to thank all the participants, and Medbase Sportsmedical Center Abtwil for their support and expertise. We would like to thank Simon Storm for his support and openness. We would like to thank Linda Ammann for all her effort and support in making this project possible. The results of the study are presented clearly, honestly, and without fabrication, falsification, or inappropriate data manipulation, and statement that results of the present study do not constitute endorsement by ACSM.
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GH, and AF designed study and performed experiments. PMB, BK, and AF performed the analysis and drafted the manuscript. PMB, BSK, and AF edited the manuscript.
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Dr. Feldmann is a minority shareholder of, and professional contributor to Fortiori Designs LLC, the company that manufactures and distributes the NIRS device used in this study. Mr. Batterson is a professional contributor to Fortiori Designs LLC.
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Communicated by I. Mark Olfert.
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Batterson, P.M., Kirby, B.S., Hasselmann, G. et al. Muscle oxygen saturation rates coincide with lactate-based exercise thresholds. Eur J Appl Physiol 123, 2249–2258 (2023). https://doi.org/10.1007/s00421-023-05238-9
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DOI: https://doi.org/10.1007/s00421-023-05238-9