So warning about super-high intensity workouts. For a good while I would sprint hard as possible up 8 flights of stairs everyday instead of taking the elevator. I would do this multiple times per day (3,4 sometimes 5) with no warm-up/cool-down . Each time I would try to push for a PR, figuring might as well go for it! One day, after about a year of doing this, I noticed my heart rate at the top felt a little off. I tested with my watch and it said I was in AFIB. I was able to get back to normal sinus rhythm via getting zapped at the ER, but ever since then if I push too hard (usually on longer runs, going all out) I end up back in AFIB. Though it will reset the next morning.

This could be pure coincidence, but I would recommend doing proper warm-up and cool-down before going all out with HIIT. FYI I'm in my 40's.

▲

Bogdanp 4 hours ago | parent | next [-]

Regardless of the sport you practice, you probably need to be doing some form of periodization. You can’t go for PRs every session because at some point your body stops being able to recover => you get hurt.

▲

JumpCrisscross 3 hours ago | parent | prev | next [-]

You may want to talk to your doctor about potential exercise-induced cardiac remodeling. Not an expert on this at all. But it’s an injury mode that’s been recently characterized due to sudden deaths among young, seemingly-healthy sprinters.

▲

deeth_starr_v 3 hours ago | parent [-]

Very interesting. I can also get Afib after many years of high intensity exercise

	▲	all2 3 hours ago \| parent [-]
		This happens to me occasionally, but it's typically stimulant and blood sugar related. There are some indications that it might be related to ion availability in your body, so copper, zinc, and calcium specifically. You may also consider that HF RF found in phones, wifi, and Bluetooth can do not great things to the calcium channels in cell walls (it essentially locks the channels open in some cases). There are a lot of factors to this, but these are things I've picked up in my reading for my own issues.

▲

3 hours ago | parent | prev | next [-]

[deleted]

▲

AnimalMuppet 2 hours ago | parent | prev [-]

> FYI I'm in my 40's.

Bad news: Age is a risk factor for AFIB. The older you get, the more likely it is to happen.

	▲	proee 2 hours ago \| parent [-]
		Also a significant increase in AFIB risk for runners. I am doing around 10-20MPW over the last 5 years. Not sure if this is enough training load, but I've had a habit of pushing too hard on my runs as well.