HRV (heart rate variability) is the variation in time between heartbeats and is a well-established indicator of nervous system flexibility.
Calm Heart is Sens.ai’s HRV biofeedback training. It guides you through personalized breathing at your resonance breathing rate, the pace where breath and heart rhythm synchronize, which strengthens your parasympathetic nervous system tone.
Our Science Page outlines more on HRV.
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