About 10 years ago my then doctor told me I was out of shape, over weight, had high cholesterol and I should take a stress test. About 3/4 of the way through the test, he stopped the test and told me to sit down, that I had failed the test. He put me on heart medication and cautioned me against any exertion until I could see a heart specialist. The following Monday I saw the heart specialist. Long story made short, after conducting a second, more accurate test using x-ray and dyes injected into the blood stream, I was informed my heart and circulation system were fine, no blockage whatsoever. His only caution, don't ever take a stress test again. According to the heart doctor, there is a percentage of the population that, when being monitored during the treadmill stress test, send off a false positive indicating to the equipment that there are heart/circulation problems, but actually have no such problems, and I'm one of them. Strange!