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Psychosomatic Medicine, Vol 54, Issue 4 462-470, Copyright © 1992 by American Psychosomatic Society
ORIGINAL ARTICLES |
T Kamada, S Miyake, M Kumashiro, H Monou and K Inoue
Department of Ergonomics, University of Occupational and Environmental Health, Kitakyushu, Japan.
Recently several studies have suggested that there are differences in autonomic balance between Type As and Type Bs. This study evaluates a sympathovagal interaction in Type A (n = 8) and Type B (n = 11) male students during a mental arithmetic task by power spectral analysis of heart rate variability. The low-frequency component to high-frequency component ratio was significantly greater in Type As than in Type Bs during a resting period. No significant differences were found in heart rate changes and blood pressure between the two kinds of subject groups. The present findings indicate that there was a significant difference in sympathovagal balance between Type As and Bs. Type As showed dominant sympathetic activity.
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