Mental stress may cause a dissociation of sympathetic outflow to different regions.
However, it remains unclear how the sympathetic outflow to jaw muscles is related to
other sympathetic outflow under mental stress. The objective of this study was to
clarify the temporal relationship between the finger sweat expulsion elicited by
mental stress and the hemodynamic and electromyographic changes in the masseter
muscle. Healthy adult female volunteers participated in this study. Masseteric
hemodynamic changes were closely time-related to mental stress, showing a decrease in
oxygen saturation of muscle blood around the onset of mental stress. In contrast, EMG
activity of jaw-closing muscles was not time-related to mental stress. These results
suggest that mental stress induces hemodynamic changes that are not associated with
EMG activity in the masseter muscle of healthy adult females.
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