PT - JOURNAL ARTICLE AU - Guilherme Fregonezi AU - Janaina Dantas Pinto AU - Lailane Saturnino AU - Bruno Henrique Ferreira da Silva AU - Illia Nadinne AU - Rêncio Florencio Bento AU - Fernando Augusto Lavezzo Dias AU - Selma Bruno AU - Vanessa Resqueti TI - Dynamic hyperinflation and effects of pursed lips breathing on chest wall kinematics during exercise in patients with asthma DP - 2012 Sep 01 TA - European Respiratory Journal PG - 4706 VI - 40 IP - Suppl 56 4099 - http://erj.ersjournals.com/content/40/Suppl_56/4706.short 4100 - http://erj.ersjournals.com/content/40/Suppl_56/4706.full SO - Eur Respir J2012 Sep 01; 40 AB - To assess the effects of exercise on lung volumes and the influence of Pursed Lips Breathing (PBL) on operational lung volumes in asthma patients. In 14 patients, 33.9±10 years/old,FEV1%:65.7±18.6, lung volumes were assessed by opto-eletronic plethysmography.Two incremental submaximal cycling test (ISET) sets based on 3 min. rest, 1 min. unloaded pedaling and 30w increase in workload every min. during free breathing and PLB were done. We identified two patterns of changes in operational volumes at 100%max. workload in free breathing.Patients that increase End Expiratory Lung Volume (EELV) ΔEELV=0.27±0.5L and developed Dynamic Hyperinflation (DH),hyperinflators (HG,n=6) and patients that decrease EELV euvolumics (EG,n=6) ΔEELV=-1.07±0.8 L.Rib cage pulmonary (RCp) was the main responsible to increase in EELV in HG.Variation of End Inspiratory Lung Volume (ΔEILV) in HG was significantly different from EG,1.5±0.8 vs 0.31±0.4.PLB induced changes in EILV in both groups during in chest wall and RCp compartment. In abdominal compartment ΔEILV significantly increased with PLB in all moments except at 50%max. workload.PLB induced changes on EELV in RCp compartment at 100%max. workload in EG and at 50%max. workload, 1st and 2nd recovery time in HG.Exercise induces different changes in operation lung volume in patients with asthma. PLB modulate breathing pattern and improve operational lung volumes.