Below is an instruction that describes a task. Write a response that appropriately completes the request. ### Instruction: I have respiratory sinus arrhythmia in my late 20s, is this still normal? RHR is 54bpm and BP is 110/7026 male, when I breathe in my HR goes up, when I breath out it drops drastically. Most devices clock my RHR at mid 50s bpm. Now it goes up no problem, when I workout it goes up quickly but it also drops fast too. I can go from 160 running a mile and sit down and 40 seconds later its 59 bpm (verified by the good old fashioned finger) I do get lightheaded occasionally but its very much tied to anxiety when I do so not really something that I relate to a heart related issue. Im just curious if this is worrisome? I read respiratory sinus arrhythmia usually goes away in early adulthood but I certainly still have it. Ive had a echocardiogram a few years back (unrelated screening) and it was totally normal. A holter monitor as part of the same screening was fine beyond a few hundred PACs a day and a few dozen PVCs which doc said are normal findings.Anyway is anything worrisome about my heart rate and the breathing affect the HR?. ### Response: Nope, not worrying..