Just tried to do an OI test on myself. IDK if I did it all right, but here's the results: Laid down (11:47) 11:50 91/66 (82) 11:57 87/70 (89) Stood up (12:00) 12:02 104/77 (112 aryth) 12:06 103/77 (113 aryth) 12:11 98/68 (110 aryth) 12:15 103/81 (123 aryth) Then son came home from preschool, so had to stop. I did it an hour after eating/drinking, and it was on the left wrist (laid wrist on hip while laying down and testing, prone by side when not testing, and when standing tested with hand up to opposite shoulder and right hand under left elbow). Arrhythmia cordis automatically noted by device. I've had two ECG's and passed both with flying colors. But then I was laying down. Are you supposed to get tachycardia when you test just standing still? At most I just moved my head around and moved my arm up to my shoulder. Just tested again after showering and such, standing for 45 minutes or so straight, and my reading was 103/87 (98 aryth). I was sitting when I did the reading (just sat down on my bed and immediately pressed start). My device helpfully averages the last 3 readings, and now my average is 101/78 (110). So narrow pulse pressure - how concerned should I be? Could I have POTS or something like it? I'm going to take my meter to Tai Chi tonight and see what my heart rate is like after class. I can make the SIL the control subject.