Re: The study cited

["Sandy Bolinger" <bolinger@bigsky.net>]

four horses on a treadmill..in a test that is in no way comparable to a 50
or 100 mile endurance ride...four horses, TOM...is that it???is that all
you've got to back up your factoid that the CRI is not valid....?????? WOW
----- Original Message -----
From: C Eyler <eyler@mindspring.com>
To: <ridecamp@endurance.net>
Sent: Saturday, February 19, 2000 10:04 PM
Subject: RC: The study cited


> I know little about eventing except that is has the three phases.  How
does
> the duration of work in this study compare to a 50-100 mile endurance
ride?
> If it was significantly less, how can we know that these results would
hold
> true for endurance distances at relatively slow speeds?  And I say slow,
> Tom, because that will be the case in rides with difficult, technical
> terrain, where many US endurance riders compete.
>
> Cindy
>
> > J Sports Med Phys Fitness 1998 Sep;38(3):181-7
> >
> >
> >
> >
> > Equine Vet J Suppl 1995 Nov;(20):78-84
> >
> >
> >
> > Clinical observations made in nonheat acclimated horses
> > performing treadmill
> > exercise in cool (20 degrees C/40%RH), hot, dry (30 degrees
> > C/40%RH) or hot,
> > humid (30 degrees C/80%RH) conditions.
> >
> > Harris PA, Marlin DJ, Mills PC, Roberts CA, Scott CM, Harris RC, Orme
CE,
> > Schroter RC, Marr CM, Barrelet F
> > Physiology Unit, Animal Health Trust, Newmarket, UK.
> >
> > Four horses (H, J, N and M) undertook a treadmill competition
> > exercise test
> > (CET), designed to simulate the physiological and metabolic
> > stresses of the
> > Speed and Endurance phase of a 3-day-event, under 3 different
> > environmental
> > conditions: 20 degrees C/40% relative humidity (RH) (cool, dry [CD]: 2
> > sessions); 30 degrees C/40%RH (hot, dry [HD]) and 30 degrees
> > C/80%RH (hot,
> > humid [HH]) (Marlin et al. 1995). A number of subjective clinical
> > observations were made at designated time points throughout the
> > exercise test
> > and initial recovery period including buccal mucous membrane
colouration,
> > capillary refill time, neck and point of shoulder skin pinch
> > recovery time,
> > grade of abdominal sounds; anal sphincter tone as well as the presence
or
> > absence of fatigue and ataxia. The aim was to investigate their value in
> > predicting performance in the final canter phase of the CET
> > equivalent to the
> > cross-country or Phase D of a field competition. In addition, the
> > use of a
> > more objective assessment, the cardiac recovery index (CRI), was
> > investigated
> > together with the heart rate, rectal temperature and respiratory
> > frequency at
> > the end of Phase C and at the 8 min point of the 10 Minute Box
> > (8'X). The CRI
> > was calculated according to the formula CRI = P2-P1 where P2 =
> > the heart rate
> > in beats/min at the 8 min point of the '10 Minute Box' (Phase X)
> > of the CET.
> > P1 = the heart rate (beats/min) at the 7 min point just before
> > the horse was
> > made to trot over a distance of 80 m at a speed of 3.7 m/s (at a
> > 3 degrees
> > incline) before returning to a walk. The study suggested that the
> > subjective
> > tests carried out at the 'End-C' and/or '8'X' time points were
> > not useful in
> > predicting subsequent performance in the final canter phase (Phase D)
and
> > neither were heart rate, rectal temperature or respiratory
> > frequency. However,
> >  the only horse (Horse H) to complete the full CET under HH
> > conditions was
> > the only animal to show a decrease in respiratory frequency
> > between the End-C
> > and 8'X time points. All others showed an obvious increase. Under HH
> > conditions, Horse H also had the lowest CRI. For 3 of the horses
> > the highest
> > CRI value was found under the HH conditions, for the fourth horse
> > an equally
> > high CRI value was found with one of the CD sessions. However,
> > under the HH
> > conditions, both P1 and P2 values were > 100. The study suggested that
it
> > could be beneficial if a suitably modified CRI test, as well as a
> > procedure
> > to monitor the change in respiratory frequency during the 10
> > Minute Box, were
> > evaluated further on the treadmill and in the field with respect to
their
> > potential usefulness as additional aids to the assessment of a horse's
> > suitability to proceed to Phase D.
> >
> >
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