Am 72 year old male, active with tennis, walking. Just got weened off atenolol onto losartan.50mg. Blood pressure readings good, but pulse rate in 70 s, resting, and goes to 80 s when busy. When doing mild machine exercise or playing tennis, it elevates to 96,97 etc. Feel pressure in chest and sometimes light faint. Was better with 25mg which had heart rate in 60 s. Atenolol had it in the 40 s. Awaiting for some answers.