I take Beta Blockers for heart issues and there's no question about taking them. I need them, and that's it. My heart rate doesn't get anywhere near the rate recommended for cardio but I take into consideration that my resting heart rate is a lot lower because of the meds. For you, I would use other factors to judge the effectiveness of your cardio. Such as, do you work up a sweat? Can you carry on a conversation, but not sing? Your body is probably working out at a good rate, but just not showing it in your heart rate. Please don't take my comments as medical information. It's just my opinion. To be sure, discuss this with your doctor or an exercise physiologist.
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