Assessment and distribution of aerobic and anaerobic contribution during 800m race in the competition

Aim -- Determine the part of each energetic system at different times of 800m competition. Oxygen uptake and speed were recorded continuously. Materials and methods -- Five athletes performed on an outdoor track a test to determine the maximal oxygen uptake and the maximal aerobic speed and a supramaximal exercise of 800m. Results -- The overall energetic expenditure as well as the oxygen deficit assessed at 31.9% were almost identical at those obtained during an 800m race running on a treadmill. Only the repartition of the oxygen deficit notably differed during the race. This suggered that the kinetic of the speed had a determining incidence on the anaerobic contribution as well as aerobic contribution when there were changes in running velocity.Original Abstract: Objectif -- Determiner la part de chaque systeme energetique aux differents moments d'un 800 m couru sur le mode de competition en mesurant en continu la consommation d'oxygene et la vitesse reelle de course. Materiels et methodes -- Cinq athletes ont ainsi effectue sur une piste de 400 m, un test progressif de determination de la consommation d'oxygene maximale et de la vitesse maximale aerobie ainsi qu'un exercice supramaximal de 800 m. Resultats -- Ils mettent en evidence une depense energetique globale et un deficit d'oxygene evalue a 31,9 % quasi-identiques a ceux obtenus au cours d'un 800 m realise sur tapis roulant mais montrent une repartition differente du deficit d'oxygene. Ceci suggere que la cinetique des vitesses a une incidence determinante aussi bien sur la contribution anaerobie qu'aerobie lorsque existent des variations de vitesse importantes.