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Heart Rate VariabilityHRV is the variation of beat-to-beat intervals of the heart. A healthy heart has a large HRV, while decreased or absent variability may indicate cardiac disease. As a marker of cumulative wear and tear, HRV has been shown in research to decline with the aging process. Although resting heart rate does not change significantly with advancing age, there is a decline in HRV, which has been attributed to a decrease in efferent vagal tone and reduced beta-adrenergic responsiveness. Regular moderate physical activity (which slows down the aging process) has been shown in research to raise HRV, presumably by increasing vagal tone. It has been suggested by some that HRV could be part of a serious anti aging regimen as a biomarker of aging, and as a way to monitor the effectiveness of anti aging exercise, for example. Heart Rate Variability - StudiesCohen, H., Matar, M. A., Kaplan, Z., & Kotler, M. (1999). Power spectral analysis of heart rate variability in psychiatry. 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