In reply to Mark Edwards: Just thought I would add a bit more info and perhaps a warning that those of us used to being active shouldn't make assumptions. I had found myself slower than usual up familiar hill trails and getting out of breath, highly unusual. Didn't link this to the lungs not getting oxygen sufficiently pumped by the heart. Thought it was old age catching up with me. Did a stroll to a pub lunch with an old friend who has a pacemaker who got really worried when I lagged behind him. I had had an ache in the chest under my pack straps, thought I had a chest infection, went to the gp who gave me antibiotics. When they didn't work after two days my wife whisked me off to the gp again - who called an ambulance. Pity he couldn't recognise a heart attack the first time.
In the absence of any help from the nhs I started doing short walks, a mile or so on flat trails, legs felt heavy at first, very slow,but I soon felt able to get back to a normal cadence. My wife came with me, did her the world of good, she lost half a stone. I find the best rehab walk is not too far, perhaps three miles max, but at a brisk pace, rather than a longer slower walk. I am used to using a pair of poles, sort of modified nordic walking style, and these both assist and give my cv system a better work out. Just starting back at the gym wearing a heart monitor set to a maximum heart rate.
The one nhs rehab session I went to involved a truly minimal circuit on gear apparently rescued from a skip. Attitude totally negative. I picked up a tiny dumb bell like those used by girls doing aerobics and was told, that's too heavy (I warm up on 30lbs per arm in the gym, bicep curls). I went up two steps on a primitive step device, got warned again, tried moving sideways on the low step as in step aerobics, got a sarcastic putdown 'oh, you'll put us all to shame'.
I am worried about the number of drugs I am supposed to be taking, most to aggresively lower my normally low blood pressure - I started to get dizzy moments. So I am now querying those. Noone seems interested in finding why I had the problem in the first place. Found I had a cholesterol level nudging into the danger zone years ago which I wasn't told about. I now wonder if a much reduced activity over the last eighteen months - missed my usual month in the alps - allowed the blockage to build up.
So - if you find yourself getting unusually out of breath up hills, don't dismiss the idea of a heart or artery problem - get it looked at, preferably by a gp who knows what he is doing!