13 research outputs found
Influence of chromium supplementation on energy metabolism in horses used in policing activity
Clenbuterol plasma concentrations after repeated oral administration and its effects on cardio-respiratory and blood lactate responses to exercise in healthy Standardbred horses
Androgen receptors and skeletal muscle composition in trotters treated with nandrolone laureate
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Studies of meclofenamic acid and two metabolites in horses-pharmacokinetics and effects on exercise tolerance
Effects of Draft Loaded Training on Circulatory and Blood Lactate Responses During Exercise in Horses
Relationship of Plasma Lactate Production to Cortisol Release Following Completion of Different Types of Sporting Events in Horses
peer reviewedaudience: researcher, professional, studentFifty-eight healthy horses were studied during five sporting events of various intensities and durations, namely show-jumping (n = 6), cross-country in a three-day event (n = 30), trotting races (n = 7), galloping races (n = 7) and endurance rides (n = 8). Venous blood samples were collected at rest and immediately after exercise and analysed for plasma cortisol (CORT) and lactate (LA) levels. The experimental procedure was the same throughout the investigation so as to permit a reliable comparison between the five types of exercise. The type of event significantly affected both the resting (p < or = 0.05) and the post-exercise (p < or = 0.01) plasma CORT. The degree of exercise-induced hypercortisolaemia was related to both the intensity and the duration of exercise for all five sporting events, but the endurance ride induced the most and show-jumping the least serious post-exercise CORT changes. LA production was much more closely related to the intensity of the exercise than was CORT. It is concluded that simultaneous measurements of plasma CORT and LA levels may be useful to discriminate between different types of exercise, adjust training programmes, and improve our comprehension of the physiology of sport horses at exercise