glad to know you trust in healthcare magic. Your daughter/17yrs, has high heart rate
only during such exertions? Is it a new development or having it since early childhood.Has she got any fever/infections? Another common reason is thyroid status.Certain medications like amphetamines
, cocaine, caffeine, ephedrine, antihistamines, phenothiazines, antidepressants, tobacco, theophylline
also cause such effects.So I would suggest you to rule out these factors i mentioned, go for a thyroid profile and get a detailed ECG(with rhythm strip-to analyse its type) and finally an echocardiography
with cardiologist's opinion.