Hello & welcome @teeger Great question! According to the Fitbit article on heart rate (<-- click link), there are multiple factors that can affect resting heart rate. Several factors can affect resting heart rate: stress, alcohol or caffeine intake, or fever usually raise resting heart rate, while regular exercise or meditation can lower it. Air temperature and certain medications can also affect resting heart rate. I don't doubt that there are more factors. For example, I recently had bad allergies that resulted in congestion in my sinus system and conjunctivitis. Looking back at my resting heart rate during that time, I noticed my RHR rose relatively significantly as I started to get sick. After taking medications prescribed by the doctor, my RHR is back to pre-illness rates. Now you've got me interested in doing some research and reading to get a better understanding of how & what factors affect our RHR. 🤔
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