Resumen de Effects of Exercise Mode on the Oxygen Uptake Kinetic Response to Severe-Intensity Exercise in Prepubertal Children

Fabiana Andrade Machado, Luiz Guilhermo Antonacci Guglielmo, Camila Coelho Greco

• The objective of this study was to verify the effect of the exercise mode on slow component of VO2 (VO2SC) in children aged 11�12 years during severe-intensity exercise. After determination of the lactate threshold (LT) and peak VO2 (VO2peak) in both cycling (CE) and running exercise (TR), fourteen active boys completed a series of �square-wave� transitions of 6-min duration at 75%? [75%? = LT + 0.75 3 (VO2peak�LT)] to determine the VO2 kinetics. The VO2SC was significantly higher in CE (180.5 ± 155.8 ml · min�1) than in TR (113.0 ± 84.2 ml · min�1). We can conclude that, although a VO2SC does indeed develop during TR in children, its magnitude is considerably lower than in CE during severe-intensity exercise.