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. Author manuscript; available in PMC: 2018 Jan 1.
Published in final edited form as: Respir Physiol Neurobiol. 2016 Sep 19;235:18–26. doi: 10.1016/j.resp.2016.09.008

Figure 1. Tissue saturation index (TSI, %) changes during the NIRS muscle assessment.

Figure 1

Panel A. Protocol phases, and the parameter calculated from the analyses of TSI signal changes, are indicated at the bottom of the graph. Grey shading indicates brief dynamic plantar-flexion exercise. AO = arterial occlusion; max and min = highest and lowest TSI values during the Physiologic Normalization (PN) phase; TSILOW = lowest saturation value reached during oxidative capacity assessments (for further details see Methods). Panel B. Expansion of panel A to illustrate the linear regression to determine the deflection point of muscle TSI (arrow) during the sustained arterial occlusion (AO). Grey shading indicates brief dynamic plantar-flexion exercise.