Figure 3. Changes in the masseter muscle that are time-related to the onset of finger sweat expulsion. Each value at non-PWSE was normalized to the corresponding value at PWSE (100%). PWSE, proximal window of sweat expulsion (see Fig. 2). IEMG, integrated electromyographic activity; OxyHb, oxygenated hemoglobin; DeoxyHb, deoxygenated hemoglobin; StO₂, tissue blood oxygen saturation; FSBF, finger skin blood flow.