When does a person’s heart rate become ‘dangerous’?
From the Medical News Today website

A person’s heart rate may become dangerous if it is too high or too low. However, many factors can affect when a heart rate is dangerous.
The heart rate changes throughout the day to accommodate the demands of the body. It is higher during times of intense activity and lowest when a person relaxes or sleeps.
The heart rate also changes during pregnancy, fever, and times of anxiety.
Identifying a person’s usual heart rate pattern can help them understand what a dangerous heart rate is for them personally.


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