Airway clearance therapy is an important treatment strategy in patients with respiratory disease and impaired mucociliary transport (e.g. cystic fibrosis [CF]) [1-4]. Airway clearance techniques (ACTs) supplement the mucociliary clearance system in the presence of disease-related impairment [2], and are important for maintaining respiratory health [4]. Current airway clearance interventions are based mainly on physical or mechanical measures to move air behind mucosal obstruction, and modulation of expiratory airflow to enhance movement of secretions to more proximal airways for more effective clearance [2]. ACTs in obstructive lung diseases encompasses very various interventions including 1/ manual chest physiotherapy (CP): conventional CP (postural drainage, percussion, vibration, forced expiration technique, directed cough), autogenic drainage and active cycle breathing technique, and 2/ airway clearance devices (ACD) as Positive Expiratory Pressure (PEP), oscillating PEP and high frequency chest wall oscillations [2, 5]. ACTs have been shown to have beneficial short-term effects in increasing transport mucus away [5, 11] with no clear differences in effectiveness between techniques [6-10,12,22].Whatever the approach, the overall goal of airway clearance therapy is to improve mucus clearance, thus decreasing the risk of bronchial infection, attenuating disease progression and lung function decline, and improving quality of life [4,[11][12][13]. However, strategies such as CP are intensive and time-consuming, may require assistance from a physiotherapist or caregiver, and can be uncomfortable for patients [5]. Furthermore, these strategies require time and effort from the patient and their caregivers, and adherence to CP may be suboptimal in adults with CF [14], and compliance with CP is comparatively low in this group (53%) [15].