Work Productivity in Hyperventilation Syndrome

Inclusion Criteria: * Holders of employment contracts for at least 8 days * Diagnosis of hyperventilation syndrome confirmed by: Compatible symptoms and at least two symptoms reproduced by the hyperventilation challenge test: Nijmegen's score\> 23 ; Demonstration of alveolar hyperventilation ( Either on rest blood and / or at rest (PaCO2 at rest \<36 mmHg and D (A-a) O2 normal; Either during the HV test (increased recovery time of the basic PETCO2 after voluntary hyperventilation (greater than 5 minutes) Exclusion Criteria: * Existence of another chronic pulmonary disease (asthma, bronchial dilation, COPD, diffuse interstitial pneumonia, neuromuscular pathology ...) or cardiac (rhythm disorder, ischemic heart disease ...) which can participate in dyspnea * Psychiatric illness / psychotropic treatment * Pregnancy * Patient already included in a clinical research protocol involving new therapeutics may not be included in this protocol * Specific physiotherapy or previous training