reference values

I've written an overview of the problems with Postural Orthostatic Tachycardia Syndrome (POTS) criteria. https://mecfsskeptic.com/the-problems-with-pots/ A brief summary of the arguments looks like this: A heart rate increase of 30 bpm (or 40 bpm in 12–19-year-olds) is far from abnormal. Many...