I have recently started running in an effort to run my first 5K (couch to 5K program from coolrunning.com). I was not a couch potatoe before I started the program - and was already doing 4 to 5 hours cardio a week.
My question is this:
When I do the running segments of this program (I'm on week 4), my HR gets way up there (I'm 39, my estimated max HR by the charts is 181). Usually by the end of the running segment, my HR is up to 168 - so OVER 90%.
I'm not worried that I am in the "anaerobic zone" and not burning fat - I'm doing this to build my running endurance not burn fat. (I spend an additional 30 to 45 minutes in a "fat burning zone" after I have completed the couch to 5K workout for that day to make sure I am still getting the "aerobic" benefit of my cardio)
What I am worried about: how dangerous is this? And if it is dangerous and I need to build up my cardiac capacity so that I can do the running without my HR going this high, what's the best way to do that -I am assuming you do this with cardio - but then should I be doing it at the higher end of a safe heart rate?
Looking to hear from informed people.
Thread: Cardio at a high heart rate