Comparing muscle V̇o2 from near-infrared spectroscopy desaturation rate to pulmonary V̇o2 during cycling below, at, and above the maximal lactate steady state

Abstract

It is unknown if muscle oxygen uptake (V̇o2m) derived from near-infrared spectroscopy oxygen desaturation slope during 5-s blood flow occlusion, is similar to the pulmonary oxygen uptake (V̇o2p) across time and among different exercise intensities. We showed that 1) V̇o2m and V̇o2p had similar responses across time and among intensities below, at, and above the maximal lactate steady state; 2) both variables were strongly correlated; and 3) there was no difference between females and males.