The slow component of VO2 uptake kinetics during high-intensity exercise in prepubertal children

• Published in: Science & sports 2001-12, Vol.16 (6), p.315-317
• Main Authors: Obert, P, Cleuziou, C, Candau, R, Courteix, D, Lecoq, A M, Guenon, P
• Format: Article
• Language: eng ; fre
• ISSN: 0765-1597
• DOI: 10.1016/S0765-1597(01)00100-9

Aim- The aim of the present study was to investigate the VO2 uptake slow component in prepubertal children of different aerobic capacity during high intensity exercise. Method- Twenty three (12 well-trained and 11 untrained) prepubertal children took part in two constant-power tests performed at intensities corresponding to 80% of the anaerobic threshold and 90% of maximal aerobic power. VO2 kinetics during both constant-power tests was determine using a monoexponential + linear term model. Results/conclusion- Our results demonstrated the existence of a slow component during heavy intensity exercise in prepubertal children, as previously described in adults. The magnitude of this slow component did not differ between trained swimmers and untrained children exercising at the same relative intensity, provided that the whole VO2 response was considered.Original Abstract: Objectif- Le but de ce travail etait d'etudier la composante lente de la consommation en oxygene (VO2) lors d'un exercice rectangulaire d'intensite elevee chez des enfant prepuberes presentant des niveaux d'aptitude aerobie differents. Methode- 20 garcons et filles (12 nageurs et 11 temoins) ont participe a deux tests rectangulaires realises respectivement a 80 % du seuil anaerobie (80 % SA) et 90 % de VO2 max. Pour chaque test, la cinetique de VO2 a ete modelisee a partir d'une mono-exponentielle suivie d'un terme lineaire. Resultats/conclusion- Tout comme chez l'adulte, nos resultats mettent en evidence chez l'enfant l'existence d'une composante lente De VO2 lors d'un exercice rectangulaire d'intensite elevee. Lorsque que cet exercice est realise a une meme intensite relative d'effort, l'ampleur De la composante est cependant similaire entre des sujets presentant des aptitudes aerobies diverses.