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As per everyone else, see specialist. Sudden cardiac deaths in athletes can be due to magnesium deficiency. A close friend who was exceptionally fit, working as a messenger and started having scares with his heart was referred to a specialist who had experience with this, a few days into magnesium supplementation, he was good, no further problems. Don't assume its that, get proper diagnosis, but it may be worth supplementing in high dosage in meantime.
welpeur
Whats going on here? Is it normal to have a big HR spike after going a bit hard on a rep?
A bit of context: I was planning on doing 8x 4min @105% FTP with 1:30 recoveries on the turbo (a session I've done plenty of times) but it was too nice not to ride outdoors so I rode out to a quietish little climb to do the session there. I rode out easy and rather than watching my power meter on the first climb I rode to feel and probably set off a bit quickly. At the top I was pretty pooped, but not too bad - but as soon as I turned around to ride back down my heart felt like it was going to jump out of my chest. Normally my HR-Max is 170-175... 180absolute tops in races (TT/CX/running) so ~220 is mega high. I don't know if the HR reading in the spike is accurate, but I could really feel it thumping. Once it calmed down I felt completely normal for the remainder of the session.
http://tpks.ws/MUGRCIOKWAXDXUIPD3FCAOCTGE