I have a question about heart muscle rebuild after high intensity cardio. I wonder if it is a proper question in this forum. If you think not, please kindly tell me where it should be.
Building muscle process like biceps is to slightly break muscle fiber first with weight training, and let it rest and rebuild for the next three days with high protein and without using it. If used, it will cause pain, or increase existing pain. Pain is a body natural mechanism to tell one not to disturb it during recovery.
But, cardio isn't the case. We cannot feel the heart muscle get sore. And, we cannot have a rest heart or we die. So, how does heart get strong differently?
Years ago I do sledgehammer almost everyday. During my annual health inspection my doctor told me I have a large and strong heart, which is equal to an professional athlete's. He actually asked me if I am an athlete. I am not. I am an engineer working with computer in front of desk in office. If I remember correctly it grows 1.5 or 2 times heart muscle thickness within half an year. This growth speed is crazy. If a body builder can increase his biceps size twice within half a year, we will call him king. But it seems pretty easy for a heart to achieve it, and I was not young. I was 37. Doctor also tell me if I indeed exercise a lot and it doesn't have any pain, then it is normal. But, I still worry about the rapid growth speed so I stop for years until recently. The next year my heart is back to regular size again. The point is that my story indicates that heart muscle building definitely has a different growth mechanism, it can grow fast without pain and rest. That's why I post a question here.