Well I didn't even see my cardiologist rather I got to see his nurse practitioner. I asked about the left ventricle operating at 65% and she shook her head and said "I don't know why they rate them like that." Apparently 55% is considered normal. Anything over that is considered above normal. So my left ventricle operates above normal.
I wouldn't think that I could ride my bicycle as much as I do if I truly had a problem.