" i am a 36 year old male who just lost 70 pounds. I go to the gym about 3 to 4 times a week. I always use the same treadmill and most times my heart rate is 150 at its max, but sometimes it goes as high as 180 and takes forever get down to 100 and i dont understand why. I have wore an event monitor for 21 days and all it showed up that i had inappriote sinus tachycardia, but when i went to get a second opinion from another cardiologist, he had me wear a holter monitor for 48 hours and my average heart rate was 77 and said that my heart wasnt tachy. I have had every heart test under the sun down, echo,, echo stress, monitors and all come up normal. My question is if I am on the treadmill and i exercise at 3.8 miles with a 3.5 incline is a 156 heart rate to high,. Bottom line I think my heart rate is too high when i do physical activity.