Beckers, S.

patient flutter physiotherapy pep mask fibrosis function study expiratory lung function period 2 weeks treatment effect chest physiotherapy expiratory pressure chest symptom technique session lung function parameters method pressure volume children lung function tests treatment period change result respir improvement sputum airway peak expiratory flow value wash-out pep mask physiotherapy drainage expiratory pressure mask expectoration 30 min device sputum production capacity postural drainage expiratory volume parameter table group van winden webber ba expiration technique expiration run-in period thoracic gas volume wash-out period lung capacity lung volumes expiratory flow range cough evaluation range 717 yrs clearance pediatr baseline netherland inhaled score sequence postural difference preference expiratory flows disease midexpiratory flow other peak flow autogenic drainage lung disease symptom score