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Effects of low intensity training on gas exchange at the start of exercise
Author(s) -
BELLENGER SARAH,
DAVIE A. J.,
EVANS D. L.,
HODGSON D. R.,
ROSE R. J.
Publication year - 1995
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.2042-3306.1995.tb04888.x
Subject(s) - horse , treadmill , zoology , medicine , intensity (physics) , heart rate , physical therapy , physics , blood pressure , biology , paleontology , quantum mechanics
Summary We tested the hypothesis that training would result in more rapid increase in V̇O 2 and V̇CO 2 following the onset of submaximal exercise. Six Standardbred horses were used and trained at submaximal intensities for 5 weeks. Horses were trained 6 days per week on an inclined treadmill (10% slope) at intensities between 40 and 70% V̇CO 2max . At the onset of training horses ran 2600 m/day which progressively increased to 4500 m/day by week 5. Testing was carried out before training and after weeks 3 and 5 of training. The test involved exercise at 2 speeds, 4 m/s and 8 m/s, both for 3 min with one h recovery between the 2 speeds. All horses performed at both speeds but the initial speed was randomly allocated. An open flow gas collection system was used to measure V̇O 2 and V̇CO 2 every 15 s for the first min of exercise and every 30 s thereafter. After 5 weeks training, mean body weight and V̇O 2max (mean ± s.e.) of the group had altered from 433 ± 5 kg to 430 ± 8 kg (P > 0.05) and from 104 ± 5 ml/kg/bwt/min to 116 ± 6 ml/kg/bwt/min (P < 0.05), respectively. There were no significant training effects on the rate of change of V̇O 2 or V̇CO 2 at either of the test speeds. By 45 s, the V̇O 2 and V̇CO 2 values had reached 85 to 95% of mean steady state values at both intensities of exercise. In general, steady state V̇O 2 and V̇CO 2 values were evident by 60 s of exercise. We conclude that horses have rapid increases in gas exchange at the start of exercise and these are not influenced by low intensity training.