+ 1 for HR training (and in the way over 20s brigade
). Glad to hear that you're making good progress after the op. I was doing HR training when I developed viral myocarditis. I'd no idea what was wrong, but was aware of the symptoms during normal day to day activities, but it was while running (or attempting to) that I could see that my HRs were right off the scale, which prompted me to see my GP.
I think that it is ideal if you're returning to fitness as the emphasis is on slower, controlled runs, so, hopefully, will enable you to make a quicker return in the long run (if that makes sense). I've seen similar improvements as BDB mentions above - more so than when I was doing more pace-based training.
Re the chafing, you could try something on your skin, underneath the strap, either Vaseline or Bodyglide if you have it the right way around, but I too have heard of people who wear it back to front. If you were to try that, you could possibly put some form of padding over the strap so it might rub less around the scar area. TBH, I've only ever used a Polar or Garmin HRM, so don't know about any other type, but you might find something on the internet.
I found Cardiac Athletes very helpful, I know your problem is not cardiac, but you might be able to find out something more about HRMs as people who have had heart surgery might have similar problems.
I've had surgery scars and used E45 and Palmers, moisturising daily. I don't know what advice you've been given, but applying a cream certainly helped reduce the inflamed scar tissue and (long term) lumps and bumps.
Good luck and do give HR training a serious go!
PS another thought - can you wear something underneath the HRM? I'm not sure whether it would pick up your HR correctly, but I know some people wear them on top of bras, so perhaps they do.
Edited: 15/03/2012 at 08:46