The Variability of Your Heart Rate

A heart rate monitor shows an average of how quickly your heart is beating in a given minute. The main driver behind that is our breathing, and it's called respiratory sinus arrhythmia. Arrhythmia doesn't mean something bad: It's actually quite natural and quite good. As we inhale, the time between heart beats is going to go down. And then as we exhale, the heart significantly slows down.

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