title: Inspiratory muscle endurance testing: pulmonary ventilation and electromyographic analysis.
abstract: This study analyzed regional pulmonary ventilation and electromyographic (EMG) activity of the respiratory muscles during an inspiratory muscle endurance (IME) test in 10 young women. Radioaerosol (99mTc-DTPA) was generated using a jet nebulizer connected to a linear inspiratory loading system. The lung scintigraphic analysis showed an increase in the radioaerosol deposition using loads of 20 and 30 cmH(2)O (p<0.01). The vertical gradient showed a larger radioaerosol deposition in the medium third of the lungs during the control period (p<0.001). There were larger amounts of radioaerosol deposition in the medium third when compared with the upper and lower third at 30 cmH(2)O (p<0.001). The horizontal gradient showed a larger deposition in the intermediate and central segments during all phases (p<0.00). Electromyographic activity from the muscles of the lower rib cage increased with loads of 20 and 30 cmH(2)O (p<0.03). There was an increase in deposition of radioaerosol when the load increased (r=0.584, p=0.000 for the left lung and r=0.609, p=0.000 for right lung). These findings suggest that during the IME test, EMG activity in the muscles of the lower rib cage increase during progressive respiratory workloads is associated with a greater radioaerosol deposition in the medium third and intermediate and central segments of the lungs.
authors.affiliation: Department of Physical Therapy, Universidade Federal de Pernambuco, Recife, Brazil.
authors.forename: Maria Elizabeth P
authors.initials: ME
authors.lastname: Nobre
authors.forename: Fernand
authors.initials: F
authors.lastname: Lopes
authors.forename: Luciana
authors.initials: L
authors.lastname: Cordeiro
authors.forename: Patrícia E M
authors.initials: PE
authors.lastname: Marinho
authors.forename: Thayse N S
authors.initials: TN
authors.lastname: Silva
authors.forename: César
authors.initials: C
authors.lastname: Amorim
authors.forename: Lawrence P
authors.initials: LP
authors.lastname: Cahalin
authors.forename: Armèle
authors.initials: A
authors.lastname: Dornelas de Andrade
mesh_terms: D000328:Adult; D000399:Air Pressure; D004576:Electromyography; D004594:Electrophysiology; D005260:Female; D005540:Forced Expiratory Flow Rates / Q000502:physiology; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008168:Lung / Q000502:physiology*; D010100:Oxygen / Q000097:blood; D010807:Physical Endurance / Q000502:physiology*; D019275:Radiopharmaceuticals; D015656:Respiratory Mechanics / Q000502:physiology*; D012132:Respiratory Muscles / Q000502:physiology*; D013147:Spirometry; D016284:Technetium Tc 99m Pentetate; D013990:Tidal Volume / Q000502:physiology; D014797:Vital Capacity / Q000502:physiology
chemical_list: D019275:Radiopharmaceuticals; D010100:Oxygen; D016284:Technetium Tc 99m Pentetate