Re: RC: HR's up to 220, etc.

[Tivers@aol.com]

In a message dated 2/15/00 7:49:38 PM Pacific Standard Time, bass@bigsky.net 
writes:

<< "Cardiac output (CO) is a measure of how much blood the heart can pump
 per minute.  CO is the product of heart rate (HR) x stroke volume (SV). . .
 Horses have maximal HRs of 220-250 bpm.   SV is around 0.8 -- 1.2 liters
 per beat.  Therefore, at maximal exercise, CO can reach over 250 liters per
 minute.  This is comparable to pumping a 55 gallon drum of blood through
 the heart each minute!  This massive CO is one reason that horses are such
 good natural athletes.
     As a horse becomes more fit, SV tends to increase and HR at a
 particular speed decreases.  Measuring the speed at which a horse can
 exercise at a specific HR (i.e., 180 or 200) gives a good indication of its
 relative fitness."
 
  >>

Can't argue with any of that--although I love to argue with Pagan.

ti