[QUOTE 5122478, member: 9609"]how does that present itself ? as in what happens ? do the legs feel extra tired because of lack of blood flow, can you still get out of breath.[/QUOTE]
It is exactly the same as it is for everyone but for me, on a bike anyway, just I'm probably going 10-15 mph slower and on hills much much slower!
I can still get a decent turn of speed though but it is very shortlived, <10-15 seconds as I'm going anerobic. My sustainable speed on the flat is only about 10-12mph and if there is a head wind can go lower! I do tire though and my limit distance wise is about 30 miles which I rarely do as it takes so much out of me. What I typically do are short hops 10 miles and under but am out almost every day (or evening in the dark and wet as it is at this time of year).
All things considered I think I do reasonably well but anxiety and confidence play a huge part. There is always the nagging doubt that if I push on I'll end up putting myself in hospital (again) after dropping dead (again) or worse still I drop dead and the ICD fails to do its job. The nagging doubt probably explains why I've been a bit authoritarian in this thread, I'd hate anyone else to suffer what I've been through, or worse.
Incidentally I never have issues whilst doing stuff, the dropping dead thing always seems to happen when my heart is at tickover. And due to the betas my resting heart rate can drop very low but never less than 40bpm as the ICD kicks in and acts like a normal pacemaker.
For one of the early cardiac arrest and shock events I was taken through the telemety of the event on screen at the hospital. Within one heartbeat the ICD started anti tachycardia pacing (ATP), on the second heartbeat I was in Ventricula Fibrillation (VF) and certain death. The ICD stopped the ATP and charged for 9 seconds before delivering a 41 joule shock and brought me back. For those nine seconds I was as good as dead. For subsequent events I've shyed away from all the gory details as sometimes not knowing is better than knowing.
As for a heart rate monitor on the bike, I don't bother with it these days as it just depresses and frightens me. Instead I go by "perceived effort".