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Mental Stress-induced Physiological Changes in the Human Masseter Muscle

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

View larger version (12K): [in this window] [in a new window]   Figure 1. Diagram of the experimental protocol. MST, mental stress task; MVCs, muscle voluntary contractions; HRV, heart rate variability.

View larger version (11K): [in this window] [in a new window]   Figure 2. Effects of mental stress on HRV spectral parameters. Lo/Hi, an indicator of the sympathetic nervous system activity; Hi/TPW, an indicator of the parasympathetic nervous system activity; MST, mental stress task. Data are expressed as means ± SEM (standard error of the mean) (n = 12). ** p < 0.01 (Scheffé).

View larger version (12K): [in this window] [in a new window]   Figure 3. Effects of mental stress on IEMGs of the masseter and temporalis muscles. IEMG, integrated electromyographic activity; MST, mental stress task. Ordinates: values normalized to the maximum of measurements from the 6 analyzed periods (Rest1, Rest2, and MST1-4). Data are expressed as means ± SEM (standard error of the mean) (n = 12) * p < 0.001 (Scheffé).

View larger version (9K): [in this window] [in a new window]   Figure 4. Effects of mental stress on hemodynamics of the masseter muscle. OxyHb, oxygenated hemoglobin; DeoxyHb, deoxygenated hemoglobin; TotalHb, total haemoglobin (OxyHb + DeoxyHb); StO2, tissue blood oxygen saturation (OxyHb/TotalHb x 100); MST, mental stress task. Ordinates: values normalized to the maximum of measurements from the 6 analyzed periods (Rest1, Rest2, and MST1-4). Data are expressed as means ± SEM (standard error of the mean) (n = 12). p < 0.1, ** p < 0.01, *** p < 0.001 (Scheffé).

Journal of Dental Research, Vol. 83, No. 3, 227-231 (2004)
DOI: 10.1177/154405910408300308


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