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Power spectral analysis of heart rate variability in Type As and Type Bs during mental workload
T Kamada1, S Miyake, M Kumashiro
1Department of Ergonomics, University of Occupational and Environmental Health, Kitakyushu, Japan.
Abstract:
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.