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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).

J DENT RES, Vol. 83, No. 3, 227-231 (2004)
DOI: 10.1177/154405910408300308

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