As seen on "Animal Makeover" of RFD TV: According to Chris Goodwin, Equine Marketing Manager:
The resting heart rate of an equine athlete is 30-40 beats per minute. The stroke volume (amount of blood pumped by the heart per beat) is about 1 liter. So the amount of blood that is pumped through the heart of a resting horse is about two 5-gallon buckets!!!
At maximum performance ( a horse running 25-30 miles per hour) the heart rate will increase to about 250 beats per minute and the stroke volume will increase to about 2 liters per beat, or about 500 liters of blood pumped through the heart per minute. That would be equal to two overflowing 55-gallon drums in ONE minute!!!!
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