Database searches retrieved a total of 3,141 citations (Fig. 1). Shortlisted citations were retrieved and checked at the title/abstract level excluding 2,765 papers. Complete articles for the ...
If you wear a fitness tracker, you've likely seen a stat labeled "HRV" pop up on your screen. But what does it mean, and does it matter? Short for heart rate variability, HRV has become a popular ...
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