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I had a stress test and IIRC they told me they shoot for 95% of peak heart rate. I asked the tech how they determine peak and she told me the computer does it - yeah, well the computer does 220-age, duh, so mine was determined to be a peak of 152. I was on the 2nd level of the treadmill and having conversation with the cardiologist and my HR was 148 bpm. Because of my nerve/muscle loss in the lower left leg he was nervous about steepening the treadmill and he decided my HR was high enough to learn what was needed from the test. I was kinda disappointed because I was just getting warmed up!
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