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Chronobiology - Te Science of Biological Time Structure [Working Title]
Circadian rhythms are omnipresent in almost any biosignal. In this chapter, we join them with the need for practical tools for screening in preventive settings and point out heart rate variability (HRV), a measure of autonomic nervous system activity, as a chronobiologic, unspecific index of mental and physical health. We discuss methods to calculate the circadian variation of HRV measures, particularly the cosinor procedure. We present reference values for circadian variation parameters of HRVdoi:10.5772/intechopen.86822 fatcat:lzeiukdafjh4bobya5lrsqtfwm