Atenolol may slow down the maximum heart rate that you can achieve by a slight amount, but it shouldn't really affect your exercise. All of the tests that you mention indicate that you have a normal heart, so the PVC's will be a nuisance but will not portend a bad prognosis for you. Common precipitants of PVC's are alcohol, caffeine, and tobacco so you should avoid these agents. Exercise, however, is good so it will be important that you keep exercising - the PVC's should not prevent you from exercising. I hope you find this information useful.
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