Aims: The aim of this study is to evaluate whether 1) the variability of their diurnal ventilation (based on the measurement of CVTV and FDI) in three groups of women: obese with AHR, obese without AHR and healthy non obese (main objective), 2) obesity-related asthma pathophysiology is linked to atopy, and 3) obese asthmatic women have a greater decrease in ventilation variability as compared to non asthmatic obese women (secondary objectives).