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Re: RC: Tieing up
In a message dated 2/19/00 6:39:52 AM Pacific Standard Time,
<< Ti wrote:
> No. Athletic horses are simply not brought to the level of fitness that
> athletes are, so there is less fitness to lose. The fitter you get the
> the more easily that fitness will be lost with time off.
So when we hear the horse described as a "natural athlete" are you saying
that this is not true? >>
Perhaps the difference in what horses can do naturally is genetics??
Just one note on natural athleticism (since heart rates, cardiac output, et
al has been a discussion topic):
One can pretty well graph all mammals on a straight line graph as to how much
they can raise their heart rate without beginning to diminish cardiac output.
(If you recall, cardiac output is the product of heart rate times stroke
volume.) What happens when the heart rate passes a certain point is that the
heart does not refill completely between beats, hence the stroke volume
declines, and the cardiac output actually begins to drop. In virtually all
mammals, this starts to occur at a rate about 4 times higher than the resting
rate. Big mammals have lower resting rates than small animals--these numbers
are not precise, but for an example, an elephant has a resting rate of less
than 20, and cardiac output begins to decline at less than 80, whereas a
mouse has a rate around 200 or so, and can go up to 800. The horse is the
SINGLE exception among species that have been studied, as he can elevate his
heart rate as much as SIX times over his resting rate, making his anaerobic
threshhold considerably higher by comparison than other species, as he can
get oxygen and fuel out to the muscle tissue at a much higher rate. (If you
want references, Tom, I'd suggest you go to vet school--learned this in
Cardiology over 20 years ago, didn't give a rat's patootie about sources
because being able to quote the reference doesn't alter the findings, but
since you seem to be in disbelief when folks in the real world mention facts
without the correct journal quotations, I'm sure the cardiology profs at
school would be glad to oblige you--they were "into" that because they were
an active part of academia themselves, but bless their hearts, they did not
ask us to cite references on exams, nor did any of the board exams require us
to cite references, either, so I didn't waste my time memorizing who
Just one of the genetic adaptations that makes horses such fabulous aerobic
athletes, and the genetic variation within the species contributes even
further to the potential of a given horse within the normal range.
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