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Factor analysis of heart rate variability in healthy people

Well established heart rate variability measures were found for nocturnal heart rate recordings of healthy people at different age. By exploratory factor analysis - the automatic method of data analysis, these measures were found to be determined by five factors. Moreover, each studied measure shown to be driven strongly by one factor only. The resulting five groups of HRV measures may be identified with the physiological phenomena commonly assumed to be involved in the heart rate regulation: (1) activity of vagal nervous system, (2) activity of the sympathetic nervous system, (3) balance in autonomic nervous system, (4) mechanisms of homeostasis - maintaining the system stability, and (5) humoral activity.