title: Acute effects of transcutaneous electrical diaphragmatic stimulation on respiratory pattern in COPD patients: cross-sectional and comparative clinical trial.
abstract: BACKGROUND
  Transcutaneous electrical diaphragmatic stimulation (TEDS) has been used to improve respiratory muscle strength in patients with respiratory muscle weakness. However, this physical therapy resource has not been studied in chronic obstructive pulmonary disease (COPD).
  
  
  OBJECTIVE
  To evaluate the respiratory pattern during one session of TEDS in COPD patients.
  
  
  METHODS
  Fifteen COPD patients participated in one TEDS session for plethysmographic analysis and assessment of peripheral oxygen saturation (SpO2) and heart rate (HR). After the session, patients were divided into two groups: Responder (R; n=9) and Non-Responder (NR; n=6) to TEDS. Statistic analysis was performed using the Shapiro-Wilk normality test and two-way ANOVA. For the parameters that showed interaction, the Student t test was used (P<0.05).
  
  
  RESULTS
  R group consisted mainly of men, with lower SpO2 and higher HR than NR group. When time (before and during) and groups (R and NR) were compared (interaction), there were differences in the parameters minute ventilation (Vent), inspiratory tidal volume (ViVol), expiratory tidal volume (VeVol), and respiratory rate (Br/M). In the intergroup comparison, differences were observed in the parameters Vent, ViVol, and VeVol. A significant effect was also observed for time in change in end-expiratory lung volume level (qDEEL), phase relation during inspiration (PhRIB); phase relation during expiration (PhREB); phase relation of entire breath (PhRTB), and phase angle (PhAng). During TEDS, there was an increase in SpO2 and a reduction in HR in both groups.
  
  
  CONCLUSIONS
  The most hypoxemic group with greater HR responded to TEDS and there was interaction between group and time of analysis for the pulmonary volumes. The time factor had an influence on the two groups with an increase in thoracoabdominal asynchrony.
authors.affiliation: Universidade Federal de São Carlos, São CarlosSP, Brazil.
authors.forename: Karina M
authors.initials: KM
authors.lastname: Cancelliero-Gaiad
authors.affiliation: Universidade Federal de São Carlos, São CarlosSP, Brazil.
authors.forename: Daniela
authors.initials: D
authors.lastname: Ike
authors.affiliation: UFSCar, Nucleus of Research in Physical Exercise, São CarlosSP, Brazil.
authors.forename: Camila B F
authors.initials: CB
authors.lastname: Pantoni
authors.affiliation: UFSCar, Nucleus of Research in Physical Exercise, São CarlosSP, Brazil.
authors.forename: Renata G
authors.initials: RG
authors.lastname: Mendes
authors.affiliation: UFSCar, Nucleus of Research in Physical Exercise, São CarlosSP, Brazil.
authors.forename: Audrey
authors.initials: A
authors.lastname: Borghi-Silva
authors.affiliation: Universidade Federal de São Carlos, São CarlosSP, Brazil.
authors.forename: Dirceu
authors.initials: D
authors.lastname: Costa
mesh_terms: D000368:Aged; D003430:Cross-Sectional Studies; D003964:Diaphragm; D005260:Female; D006801:Humans; D008297:Male; D029424:Pulmonary Disease, Chronic Obstructive / Q000503:physiopathology* / Q000628:therapy*; D012119:Respiration; D004561:Transcutaneous Electric Nerve Stimulation / Q000379:methods