You don't mention what your daughter's usual resting heart rate is. Normally the heart rate increases about 10-15 beats/ min transiently on standing up & we have no symptoms. Since your daughter has paradoxical slowing of the heart rate on standing,this could be a type of autonomic dysfunction. I recommend that she be evaluated & advised by an exercise physiologist. She'll have fitness&stress test
Answered 1/23/2023
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