In the current study, we designed a cross-over, open label, randomized controlled clinical trial that aim to investigate the superiority of physical exercise coupled with self drainage to a chest physiotherapy in stable cystic fibrosis children. We hypothesized that CF children undergoing physical exercise coupled to self drainage will increase the amount of expectorate secretions compared to conventional CP course, while being more satisfied and without worsening their pulmonary function status.

Inclusion Criteria:

• Cystic fibrosis diagnosis confirmed by 2 positive sudoriparous diagnostic tests
• Age : 7 to 17 years
• Capacity to expectorate
• Clinically stable
• Ability to pedal on a bike and to respect orders for physical session

Exclusion Criteria:

• Haemoptysis > 50ml
• Permanent non-invasive ventilation
• Respiration or digestive evolutive clinical abnormality
• Exacerbation