What is one reason that your resting heart rate might go down?

Medications to treat asthma, depression, obesity, and attention deficit disorder tend to increase your RHR. However, medications prescribed for hypertension and heart conditions (beta blockers, calcium channel blockers) typically decrease your resting heart rate.

This number can change with age, cardiovascular disease, smoking, obesity, medication usage, and even body position. (Athletes like runners often have resting heart rates in the lower end of the normal range, or slightly below it, since cardiovascular fitness makes your rate drop.)

Explanation:

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