Cardiovascular and metabolic adaptations in horses [Equus caballus] competing in cross-country events
1999
Munoz, A. (University of Cordoba (Spain)) | Riber, C. | Santisteban, R. | Rubio, Md. | Agueera, EI. | Castejon, F.
The cardiovascular and metabolic response to two cross-country events were analyzed in 8 male eventing horses. This study focused on the establishment of the main metabolic pathways involved in the muscle energy resynthesis during the competitions. Heat rate (HR) was recorded throughout the CC events. Jugular venous blood samples were withdrawn before the warm-up period, immediately after the competitions and at 5 and 10 min in the recuperation period. The following haematological parameters were studied: red blood cells (RBC), packed cell volume (PCV), haemoglobin concentration (Hb), mean corpuscular volume (MCV), mean corpuscular haemoglobin (MCH), mean corpuscular haemoglobin concentration (MCHC), white blood cells (WBC), and number and percentages of lymphocytes (LYM) and granulocytes and monocytes (GRAN). One fraction of blood was centrifuged and, in plasma, lactate (LA), total plasma protein (TPP) and the rate of LA disappearance were determined. The competitions induced significant increases in RBC, Hb, PCV, MCV and TPP. Plasma La response exceeded the anaerobic threshold of 4 mmol/l, reaching a maximum level of 13.3 mmol/l. HR ranged from 140 to more than 200 bpm, peaking at 230 bpm, revealing a limitation in the oxygen supply to the working muscles. It was concluded that muscle energy resynthesis during a CC even is provided both through oxidative processes and glycolysis with La formation. Therefore, both stamina and power excrises are required for eventing h
Mostrar más [+] Menos [-]Palabras clave de AGROVOC
Información bibliográfica
Este registro bibliográfico ha sido proporcionado por Agriculture, Forestry and Fisheries Research Information Technology Center