https://thenewdaily.com.au/life/health/2022/12/27/heart-rate-variability-fitness-tracker/
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12/27/22 at 11:02am
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The New Daily
Author
Anne R. Crecelius
36 words
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Heart rate variability is the normal, healthy, slight fluctuation of timing of heartbeats – just milliseconds difference from beat to beat.
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