Activity specific angina

I get angina like pain in my left neck when I walk and the pain generally goes away after 15-20 minutes of walk (total walk 30-35 minutes).
However when I do yoga, which is mostly stationary streaching and bending, I do not get this pain, although the rise in pulse rate is almost similar during walking and yoga.

I suffered MI 5 years back and have a damaged heart with 30% EF.

Appriciate any inputs. Thanks very much.

[ed34]

Are you sure it's angina or heart related? I've never heard of symptoms going  away with the more exercise you do. Usually, the more exercise you do, if you can push through the discomfort barrier to continue, makes it worse.

[nspower]

My cardiologist says this is "pass through angina". While exercising the arteries get dilated to meed the demand of blood and this allow more blood to flow to heart muscles reducing angina pain.
I am wondering why ths is only during walking. Why not during my sterachng exercises.

I wish I could figure out this is not angna or heart related. There must be other assocated symptoms whch could relate this type of pain to heart. Ths is causng so much stress to me. I do not want to go for cath angio, unless I am sure this is serious.

Thanks for taking interest.

[ed34]

I went for a nuclear stress test a couple of years back and they threw me onto the treadmill because they wanted a heart rate of 140 minimum. After about 3 mins I was in agony with a rate of 100 so they had to stop. After about 2 mins, the symptoms went away again. They then induced stress with chemicals and my heart was at 140 with no discomfort. I was amazed and of course asked for an explanation.
They said that if the heart could only rely on speed, this would be inadequate and certainly endurance athletes would never achieve anything. The heart can call on two things, speed and power. The more you exercise, the more the power develops and can be more effective, but it takes a lot more oxygen. So, let's say I start a daily run. At first my heart will start to beat faster and if I suffer angina, I probably won't notice much especially if collaterals are in play. When it gets to a certain speed, the heart will start to beat harder, contracting with more force with each beat, which pushes the blood further with each cycle. This gets blood to the muscles much quicker but the heart needs a lot more oxygen now to do this. This is when symptoms would kick in with some angina sufferers. After a while, the body gets into a balance where the correct oxygen levels are being supplied to the body muscles, e.g. the legs. At first everything over reacts to be on the safe side, but things then start to balance out and find equilibrium, like a fine tuning machine. In some cases the heart can relax more and stop beating so hard, but still beat quickly, which will relieve symptoms.
I'm sure, like me, you've done some exercises where your heart rate is say 140 and it feels like your heart is going to pop out of your chest and you've done some exercises reaching 140 where it doesn't feel a problem.
I know you say you don't want an angiogram, but this would be the best test for evaluating your coronary arteries and it would answer a lot of questions. Is it a fear thing?