Fig. 4.
Mean (SD) values of the NIRS-obtained muscle oxygenation index {concentration changes of deoxygenated Hb + myoglobin (Mb); Δ[deoxy(Hb+Mb)]}, which was utilized to estimate VL fractional O2 extraction, are shown as a function of work rate during KE. The Δ[deoxy(Hb+Mb)] data are expressed as a percentage of those obtained during a transient limb ischemia induced at the end of the test. The sigmoid function (Eq. 1) utilized to fit the data before BR is also shown. *P < 0.05 vs. before BR data. See text for further details.