160 near upper limit: Max. Hr = 220-age. Vigorous workout usually 70-90% of max. (132-170 for a 31 yo male). The heart rate should peak and return to resting rate over few minutes. If rate starts or drops suddenly or the rhythm is irregular you may be experiencing svt or atrial fibrillation (af). If so seek medical attention. Taller people are at higher risk of af. Go to er if chest pain, passing out, or dizzy..
Answered 4/4/2014
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