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[Blood oxygen and lactate concentrations in skeletal muscles during exercise]
Objective:
To study the relationship between blood lactate and blood oxygenation in human skeletal muscle.
Method:
Using a portable tissue oximeter based on Near-Infrared Spectroscopy (NIRS), concentration of HbO2, blood lactate and blood volume were measured non-invasively and continuously when the subjects were doing incremental exercise on a bicycle ergometer.
Result:
As the intensity of exercise was increased, blood lactate concentration, blood volume in tissue increased, while concentration of HbO2 decreased.
Conclusion:
It is possible to assess the fatigue state with tissue oximeter by monitoring intensity of exercise non-invasively and dynamically. By studying their correlations, a novel approach for measuring blood lactate non-invasively and assessing sports ability could be provided.