 [ Symptoms ] what kind of doctor does one see for hemorroids [ Disease ] beta blockers will slow your heart rate therefore when you are swimming or doing any kind of physical activity or exertion your heart rate will not increase much as it did when you were off the meds it is a whole different experience now that should not stop you from doing your activities you just cannot use the heart rate range rules to see if you are getting the caloric or fat burn you want or if you are an athlete on a beta blocker the same holds you can not use your heart rate to determine your overall activity efficiency or performance