Measurement of Respiratory Admittance for Pediatric Asthma Diagnosis

Inclusion Criteria: Asthmatic children group: * Several episodes of paroxysmal wheezes, spontaneous or after exercise, without bronchial-pulmonary infection * Absence of bronchodilator taking during last 12 hours * Absence of reported intolerance to adrenergic substances * Parental authorization and consent of child to participate to the study Control children group: \- Parental authorization and consent of child to participate to the study Control adult group: \- Consent to participate to the study Exclusion Criteria: Control children and adult groups: * At least 2 episodes of wheezes during breathing * Several wheezes, abnormal breathlessness, cough during physical exercise * Asthma diagnosed by family doctor * Administration of drugs to treat asthma * Eczema or food allergy at inclusion * Episode of cough for longer than 6 weeks, without bronchial infection * Bronchitis, throat infection, rhino-pharyngitis during last 15 days * Paleness or cyanosis with loss of consciousness when the child was a baby or during an exercise