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okay, so i have a few questions about heart rate..
1. What are some reasons why some people have higher resting heart rates and other people have lower resting heart rates?
2. Asthma is a common affliction in America. what does the use of an inhaler do to the resting heart rate?
(1) Heart Rate is one of the determinants of how much output your heart generates. If your body thinks it needs more output then one of the easy things it can do is make you heart rate higher.
Atheletes with large stroke volume (taking in a bigger volume of blood each heart beat) usually will have a slower resting heart rate to generate the same cardiac output as a normal person.
Various drugs (eg beta blockers for high blood pressure) can affect a person's resting heart rate. Beta blockers tend to slow the heart rate down.
Illness states will often tend to speed the heart rate up as the body's metabolic demands require it.
Smaller people or people with smaller stroke volumes will tend to have a higher resting heart rate.
(2) Salbutamol (a common asthma inhaler) tends to cause the heart rate to speed up. Other beta-agonists (serevent or in the combination seretide, bricanyl (terbutyline)) will do the same.
However, once the effect of the inhaler has worn off, usually the resting heart rate returns to normal (perhaps a little faster if there is some illness that has triggered off the asthma in the first place).
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