heart rate

https://autodidactauthor.wordpress.com/2017/12/18/which-heart-rate-monitor-for-me-cfs/ Bonus points obviously for saying nice things about S4ME @Clark Ellis ;)

People with ME/CFS usually find pacing the best strategy to try to avoid crashes and give the best chance of improvement over time. Some use activity diaries, others use step counters (pedometer/actometer), others use heart rate monitoring with the aim of using it to alert you to rises that...