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I'm curious to know what the difference is between having a fast heart rate during exercise and having a fast heart rate say at rest or during an anxiety attack.

It's known that exercise is good for you because your heart is a muscle and benefits from the increased heart rate that you get from exercise such as cardio. So what if someone is having an anxiety attack, and has an increased heart rate similar to if they were running on a treadmill? Do they get the same cardiovascular benefit as if they were exercising? What makes the fast heart rate during the anxiety attack so detrimental, and the fast heart rate during exercise healthy?

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It is not a fast heart rate but the underlying mechanisms that can affect health. The mechanisms involved in exercise can be beneficial and those in anxiety harmful.

EXERCISE

Physiological responses and long-term adaptations to exercise (CDC.gov):

...the cardiovascular response to exercise is directly proportional to the skeletal muscle oxygen demands for any given rate of work...

Table 3.2 from the same source shows cardiovascular changes after 6 months of endurance training, for example, increased heart volume, increased stroke volume at rest, lower systolic blood pressure at rest and increased blood volume.

Long-term exercise and the associated increased oxygen demand also results in more dense capillary network in the heart and skeletal muscles, and therefore their better oxygen and nutrients supply.

Regular exercise can have other benefits, such as easier maintenance of healthy body weight, increased muscle mass, lung volume and insulin sensitivity, and lower LDL cholesterol (CDC.gov) and mortality (PubMed).

ANXIETY

In anxiety, there is no increase in skeletal muscle oxygen demand, so there should be no cardiovascular benefits (concluding from the quoted part from the CDC.gov above). In contrary, mechanisms involved in long-term anxiety my be harmful for the heart:

Anxiety and cardiovascular risk...(PubMed):

...anxiety appears to predict more cardiovascular symptoms...and cardiovascular events.

Anxiety disorders and cardiovascular disease (PubMed):

The relationships between anxiety disorders and cardiac outcomes likely are mediated by both behavioral and physiologic mechanisms, including autonomic dysfunction, inflammation, and platelet aggregation.

  • Really great information here and good sources to read. Thank you for your answer/research. – Timothy Fisher Nov 23 '18 at 22:26

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