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Kinetics of V̇O 2 and V̇CO 2 in the horse and comparison of five methods for determination of maximum oxygen uptake
Author(s) -
ROSE R. J.,
HODGSON D. R.,
BAYLY W. M.,
GOLLNICK P. D.
Publication year - 1990
Publication title -
equine veterinary journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.82
H-Index - 87
eISSN - 2042-3306
pISSN - 0425-1644
DOI - 10.1111/j.2042-3306.1990.tb04732.x
Subject(s) - horse , kinetics , chemistry , oxygen , analytical chemistry (journal) , chromatography , physics , biology , paleontology , organic chemistry , quantum mechanics
Summary To determine whether maximum oxygen uptake (VO 2 max) in the horse is influenced by type of exercise test, five different protocols were evaluated in eight untrained Thoroughbreds exercised on a treadmill. With all protocols, horses were given a 5 min warm‐up on a 10 per cent treadmill slope. Three protocols were at a 10 per cent slope and included: 1) increasing the running speed by 1 to 2 m/sec every 60 sees from 4 m/sec to a maximum of 12 m/sec; 2) running at 12 m/sec until fatigue; and 3) running for 3 to 4 mins at speeds ranging from 6 to 12 m/sec with rest pauses between exercise bouts. The fourth protocol employed a 24 per cent slope where animals exercised for 5 mins at 2 m/sec followed by 3 mins at 5 m/sec, and 2 mins at 6 m/sec. The fifth test involved running at 11 m/sec while the slope of the surface was increased every 2 mins until the horses could not maintain the pace. A plateau in V̇O 2 occurred in all protocols except when exercise was performed on a 24 per cent slope. Slow speed exercise at a steep grade (24 per cent) produced the highest V̇O 2 (P<0.05) even though there was no plateau in the V̇O 2 . A steady state for V̇O 2 and V̇CO 2 existed 90 secs after the onset of exercise with all protocols which involved 2 mins or more at each speed. The V̇O 2 and V̇CO 2 values at all speeds of the rapid incremental exercise test were not different to those found at steady state in the third exercise protocol.