Is there anything wrong with my heart? My pulse rate just won't go beyond 135 per minutes during exercise. Prior to my recent medication, I used to run or jog as much as 2 hours in a stretch, 4 times a week. (I was training for my marathon end of this year!). However, 3 months ago, I have been diagnosed to have high blood pressure and high collesterol, and doctor put me on Atenolol and Simvor10 (statins). I still maintain my jogging regime, but reduce the speed and timing (to 60 minutes) of my jogs. I am fearful, as my heart beat just would not go past 135 per minute no matter how long I jog. Prior to my medication, my heart beat rate used to go as high as 170 per minute. Tell me, anyone, is thre anything with me - my doc told me that Atenolol is the one that lowers my heart beat rate (at rest in mornings/ evenings at 62 per minute. 75 prior to medication).