I am 58 male. I flunked stress test and had cardinal catch which showed no problem. What s up with stress test ? My heart rate climbs to 150 pretty fast (10 minutes) on stair stepper. After exercise It will drop down to normal pretty fast too. Cardiologist (sp?) does not know why, since cardinal catch showed normal/strong heart. Any ideas ? I am 58 YO male and not overweight (much). My blood pressure is good. 120/65 and ldl is 43 total cholesterol is 120.