The sympathetic and parasympathetic nervous systems act like the accelerator and brakes on a car. The sympathetic system is the accelerator, always ready to rev up and take us out of danger. The parasympathetic system is the brakes, slowing us down when danger isn’t present. When heart rate variability (HRV) is high, it shows that the parasympathetic system and sympathetic system are in balance, which is healthy and healing.
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