Heart rate variability (HRV) resources and discussion

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The Bateman Horne Center have a one page guide to using HRV for monitoring in ME/CFS.
https://batemanhornecenter.org/wp-content/uploads/2023/05/Heart-Rate-Variability-HRV.pdf
It includes what is HRV, How to track HRV and

HOW DO I INTERPRET THE HRV INFORMATION?
• High HRV can indicate low stress on the body
• Low HRV can indicate high stress on the body (e.g., exertion, PEM, illness, injury)
• If your HRV is increasing over time, it may indicate healing or improved fitness