Dear All, I wanted to create a thread about Heart Rate Variability. There are many "signals" that identify this topic as a possible Game Changer to ME/CFS -according to the software i use- but also to other diseases (hypothesis). As many of you know, in 2011 i started logging my symptoms through an app and then used certain types of analysis to try to identify what differentiates my "symptom-full" vs "symptom-free" days. Many patterns were found and this process gave me several insights in learning how my body works and which symptoms had a special meaning (one of them being tinnitus). These "signals" led me to go out there and buy a heart monitor strap, connect it with my phone and start looking straight away at the HRV patterns. I am happy to say that the patterns of symptoms i found back then correlate perfectly with changes in the HRV. So -for me- the next target is to see how i can increase my HRV which essentially means increasing the activity of the parasympathetic nervous system over the sympathetic. In this thread i will post hopefully useful insights and it would be great if any of you could add your results of your HRV readings and if / how it affects your symptoms.