HRV is mainly controlled by the body’s autonomic nervous system, says David Benditt, MD, a professor in the department of medicine at the University of Minnesota in Minneapolis. “The sympathetic [nervous system] makes the heart go faster, and the parasympathetic [nervous system] tends to slow it down. The balance between those two, on a beat-to-beat basis, controls the majority of heart rate variability,” he says.
Think of HRV as “a marker of overall health,” says Heather A. Trivedi, MD, a cardiologist at Montefiore Einstein Advanced Care in Elmsford, New York. Higher HRV is linked to better cardiovascular health and stress resilience, and lifestyle changes ranging from physical activity to quality sleep have the ability to improve it.
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