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Changes in Masseteric Hemodynamics Time-related to Mental Stress

Department of Orthodontics and Dentofacial Orthopedics, Graduate School of Dentistry, Osaka University, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan;

View larger version (30K): [in this window] [in a new window]   Figure 1. Raw signal recordings of sweat expulsion and FSBF from the finger, hemodynamic parameters from the left masseter muscle, and EMGs from the masseter and temporalis muscles. Dotted vertical lines () indicate the onset of sweat expulsion. F-Sweat, finger sweat; FSBF, finger skin blood flow; EMG, electromyogram; L, left; R, right; Temp, temporalis muscle; Mass, masseter muscle; OxyHb, oxygenated hemoglobin; DeoxyHb, deoxygenated hemoglobin; StO2, tissue blood oxygen saturation.

View larger version (27K): [in this window] [in a new window]   Figure 2. Changes in FSBF, hemodynamic parameters, and EMGs time-related to finger sweat expulsion. Data were obtained from an average of 27 sweeps of waveforms from the same subject, as in Fig. 1. A temporal reference point (solid vertical line) was obtained from the onset of sweat expulsion (dotted vertical line []), but the time delay in sensing humidity (3.2 ± 0.4 sec) was corrected by a shifting of the dotted vertical line to the solid vertical line (horizontal double-headed arrow). Twenty-second sweeps of waveform data around the onset of sweat expulsions were abstracted and averaged after alignment at the temporal reference point. The gray area indicates the 10-second period with its center at the temporal reference point and defined as a proximal time window to the onset of sweat expulsion (PWSE), and vertical double-headed arrows indicate maximum trace deflections within PWSE. F-Sweat, finger sweat; FSBF, finger skin blood flow; EMG, electromyogram; L, left; R, right; Temp, temporalis muscle; Mass, masseter muscle; OxyHb, oxygenated hemoglobin; DeoxyHb, deoxygenated hemoglobin; StO2, tissue blood oxygen saturation (OxyHb/TotalHb x 100).

View larger version (20K): [in this window] [in a new window]   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.

Journal of Dental Research, Vol. 83, No. 2, 185-190 (2004)
DOI: 10.1177/154405910408300220


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