Fig. 6From: Review of early development of near-infrared spectroscopy and recent advancement of studies on muscle oxygenation and oxidative metabolismCopyright © 2017 Willingham and McCully from Ref. [14]a Changes in oxygenated hemoglobin (O2Hb) and deoxygenated hemoglobin (HHb) during periods of cuff-induced ischemia. b NIRS O2Hb kinetics during a series of arterial occlusions following 15-s electrical stimulation (E-Stim). c Slope values from NIRS O2Hb recovery kinetics plotted over time and fit to exponential equation. In this equation, y is the relative rate of oxygen metabolism, End is the rate of oxygen metabolism at the end of exercise (S1), and Δ is the difference between the rates of resting oxygen metabolism and End. The rate constant, k, is used an index of muscle mitochondrial capacity. d NIRS set up for assessment of mitochondrial capacity in the gastrocnemiusBack to article page