Cinetique de la consommation d'oxygene chez le cycliste amateur

Aims: Study was to analyze the relationship between oxygen uptake and power output in amateur cyclists before and after threshold corresponding to a blood lactate concentration of 4mmol/l. Methods: We evaluated 109 subjects and they were divided according to age, cycling speciality, level and period. Each subject performed an incremental exercise test (50W per 3min) until exhaustion on an electromagnetically braked cycloergometer. Gas exchange data were continuously analyzed and recorded using an automated breath by breath system. Mean values of oxygen uptake were taken during the last minute of each stage in order to build and calculate the regression equations. Results: The total sample presents an oxygen-kinetic deflection after lactate threshold, with the slope before threshold significantly higher (P