Circulatory and muscle metabolic responses to draught work compared to increasing trotting velocities

Equine Veterinary Journal
M GottliebS Persson

Abstract

Circulatory and muscle metabolic responses were studied in 10 horses which all performed incremental draught work at a low trotting speed on a treadmill (D-test) and also exercise with gradually increasing velocities (S-test). Exercise was continued until the horses could no longer maintain the weights above the floor or maintain speed trotting without changing gait to a gallop. Muscle biopsies were taken from the gluteus and the semitendinosus muscles before, and immediately after, exercise. The heart rate (HR) increased linearly with both increasing draught resistance and velocity and reached mean values of 212 and 203 beats/min, respectively. Blood lactate levels increased exponentially to mean values of 12.9 and 7.9 mmol/litre in the two tests. Both HR and blood lactate levels were significantly higher at the cessation of work in the D-test compared to the S-test. The relationship between HR and blood lactate response in the S-test was similar to that in the D-test. The red cell volume was determined after a standardised exercise tolerance test and was significantly correlated both to the weightloading and to the velocity, producing a HR of 200 beats/min. The changes seen in muscle glycogen and glucose-6-phosphate were simi...Continue Reading

References

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Citations

Apr 1, 1992·Zentralblatt für Veterinärmedizin. Reihe A·R PérezE Hetz
Dec 1, 1996·Zentralblatt für Veterinärmedizin. Reihe A·M Gottlieb-VediA Lindholm
Mar 1, 1992·British Journal of Sports Medicine·J A Gutiérrez RincónI Casas Vaqué
Mar 25, 2005·Journal of Animal Physiology and Animal Nutrition·I VervuertE Watermülder

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