# Any cardiologists in the house?  Beta blocker question.

**URL:** <https://boards.straightdope.com/t/any-cardiologists-in-the-house-beta-blocker-question/730015>\
**Category:** Factual Questions\
**Created:** [September 5, 2015, 2:46pm UTC](https://boards.straightdope.com/t/any-cardiologists-in-the-house-beta-blocker-question/730015 "2015-09-05T14:46:50Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Memnon](https://avatars.discourse-cdn.com/v4/letter/m/f1d935/32.png) [@Memnon](https://boards.straightdope.com/u/Memnon)\
**Post date:** [September 5, 2015, 2:46pm UTC](https://boards.straightdope.com/t/any-cardiologists-in-the-house-beta-blocker-question/730015/1 "2015-09-05T14:46:50Z")

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I want to improve my cardiovascular strength. As I understand it, to do this I need to exercise strenuously enough that my heart rate goes up into the “cardio zone”, which is about 150bpm. However, I take atenolol, a beta blocker, for anxiety issues. Atenolol slows your heart rate (among other things) and, in practise, it’s almost impossible for me to get my heart rate up to 150bpm. Normally, I can get it up to about 120, and that’s only when I exercise hard.

Given that I can’t actually reach the “cardio zone” (and given that stopping the beta blockers just isn’t an option for me) will doing cardio actually do anything to improve my cardiovascular strength? I’ve asked my GP and he didn’t know.

Thanks.

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**Author:** ![Qadgop\_the\_Mercotan](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/qadgop_the_mercotan/32/83_2.png) [@Qadgop\_the\_Mercotan](https://boards.straightdope.com/u/Qadgop_the_Mercotan)\
**Post date:** [September 5, 2015, 3:21pm UTC](https://boards.straightdope.com/t/any-cardiologists-in-the-house-beta-blocker-question/730015/2 "2015-09-05T15:21:58Z")

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Note: I am not a cardiologist, I am a family medicine physician, but a large chunk of my practice includes cardiology.

You are still getting an adequate workout from a cardiac standpoint, for the most part. Beta blockers do decrease some people’s _ability_ to exercise, but there is a training effect, and most people can maintain a vigorous exercise routine on those meds.

And keep in mind that heart rate is just one way to indirectly measure the effectiveness of an exercise regimen, it’s not the thing that actually improves cardiac fitness itself. If you can maintain a brisk walk or jog that leaves you breathing a bit heavier yet able to carry on a conversation with a person alongside you for at least 20 minutes, you are getting a level of exercise that improves cardiac fitness, regardless of heart rate achieved. Increase the speed and/or time, and you’re getting more benefit.

That’s the simple version anyway. The more complex version has me telling you about METs and oxygen consumed, etc.

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**Author:** ![WhyNot](https://avatars.discourse-cdn.com/v4/letter/w/c77e96/32.png) [@WhyNot](https://boards.straightdope.com/u/WhyNot)\
**Post date:** [September 5, 2015, 3:28pm UTC](https://boards.straightdope.com/t/any-cardiologists-in-the-house-beta-blocker-question/730015/3 "2015-09-05T15:28:08Z")

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The American Heart Association says you still reap the benefits of cardio on beta blockers. What you cannot do is use your old target heart rate as your clue that you’re doing it right.

They suggest:

> [@](#):
>
> There are a couple of ways to monitor your exercise intensity.
> 
> 1. If you have been using a target heart rate to get to the right intensity, your healthcare provider can help to determine your new target heart rate using a brief exercise stress test . This test is used because beta blockers affect everyone differently.
> 
> 2. The second way to monitor your intensity is simpler: making sure you’re not too exhausted.
> 
> “Exercise hard – to the point of being tired – but not excessively hard,” Dr. Fletcher said. “If you reach a point where it is hard to talk, that is probably too much.”

> **[American Heart Association | To be a relentless force for a world of longer,...](https://www.heart.org/en)**
>
> Learn more about the American Heart Association's efforts to reduce death caused by heart disease and stroke. Also learn about cardiovascular conditions, ECC and CPR, donating, heart disease information for healthcare professionals, caregivers, and...

Note that if you’re on a beta blocker, it’s likely because your heart isn’t working quite right. It’s especially important that you “check with your doctor before starting an exercise program”. MOST people on beta blockers can and should exercise. A very few should not.