Heart Rate Variability (HRV)

Heart rate variability is the average measurement of the differences in time between each heart beat. “Your heart rate changes on a beat-to-beat basis – called the “interbeat interval” – modulated by your autonomic nervous system, based on your breathing rate, among other factors: “The sympathovagal interaction from the [central autonomic network] results in multiple instantaneous heart rate variations, i.e. the heart rate variability.”1

McCraty et al. state that “The analysis of heart rate variability (HRV), a measure of the naturally occurring beat-to-beat changes in heart rate, provides an indicator of neurocardiac fitness and autonomic nervous system function. Abnormally low 24-hour HRV is predictive of increased risk of heart disease and premature mortality. HRV is also highly reflective of stress and emotions.”2
Structures involved in modifying the interbeat interval include:
Nucleus Ambiguus
Nucleus of Tractus Solitarius
Sinoatrial Node
Central Autonomic Network
Vagus Nerve
Medulla Oblongata

Articles that include Heart Rate Variability:
Heart Rate Variability: Finding the Pulse On Your Recovery
Heart Rate Variability: Finding the Pulse On Your Emotions

1Castaneda, J. (April 2018). Heart Rate Variability: Finding the Pulse On Your Recovery. Retrieved from https://strvtmvmnt.co/hrv/.

2McCraty, R., Atkinson, M., Tomasino, D., & Bradley, R. T. (2009, December). The Coherent Heart: Heart–Brain Interactions, Psychophysiological Coherence, and the Emergence of System-Wide Order. Retrieved from https://www.heartmath.org/research/research-library/basic/coherent-heart-heart-brain-interactions-psychophysiological-coherence-emergence-system-wide-order/

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