title: Effects of manual percussion during postural drainage on lung volumes and metabolic status in healthy subjects.
abstract: OBJECTIVE
  The aim of this study was to evaluate the influence of manual percussion during three different positions of postural drainage (PD) on lung volumes and metabolic status.
  
  
  METHODS
  Twenty six healthy volunteers (13 women and 13 men), with a mean age of 20.15 ± 1.17 years, participated. They were randomized into three standard positions of PD (upper, middle, or lower lobes) and given manual percussion at a frequency of 240 times per minute for 5 min. Lung volumes, including tidal volume (TV), inspiratory reserve volume (IRV), expiratory reserve volume (ERV) and vital capacity (VC); and metabolic status, such as oxygen consumption (VO2), carbon dioxide (VCO2), respiratory rate (RR), and minute ventilation (VE) were evaluated.
  
  
  RESULTS
  The lung volumes showed no statistical difference in VC or IRV from percussion during PD in all positions, except for the lower lobe, where increased TV and decreased ERV were found when compared to PD alone. Furthermore, percussion during PD of the upper and middle lobes did not affect RR or VE, when compared to PD alone. In addition, percussion during PD of the middle and lower lobes increased VO2 and VCO2 significantly, when compared to PD alone, but it did not influence PD of the upper lobe.
  
  
  CONCLUSIONS
  This study indicated that up to 5 min of manual percussion on PD of the upper and middle lobes is safe mostly for lung volumes, RR, and VE, but it should be given with care in PD conditions of the lower lobe.
authors.affiliation: Department of Physical Therapy, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, 50200, Thailand. Electronic address: donrawee.leela@cmu.ac.th.
authors.forename: Jirakrit
authors.initials: J
authors.lastname: Leelarungrayub
authors.affiliation: Research Center in Back, Neck, and Other Joint Pain and Human Performance, Khon Kaen University, Khon Kaen, Thailand. Electronic address: wiceun@yahoo.com.
authors.forename: Wichai
authors.initials: W
authors.lastname: Eungpinichpong
authors.affiliation: Department of Rehabilitation Medicine, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand. Electronic address: jakkrit.k@cmu.ac.th.
authors.forename: Jakkrit
authors.initials: J
authors.lastname: Klaphajone
authors.affiliation: Department of Physical Therapy, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, 50200, Thailand. Electronic address: mujalin.p@cmu.ac.th.
authors.forename: Mujalin
authors.initials: M
authors.lastname: Prasannarong
authors.affiliation: Department of Physical Therapy, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, 50200, Thailand. Electronic address: kritsana.b@cmu.ac.th.
authors.forename: Kritsana
authors.initials: K
authors.lastname: Boontha
mesh_terms: D015916:Drainage, Postural / Q000379:methods*; D005260:Female; D064368:Healthy Volunteers; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D008168:Lung / Q000502:physiology*; D008176:Lung Volume Measurements; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D010474:Percussion / Q000379:methods*; D026741:Physical Therapy Modalities; D012119:Respiration; D055815:Young Adult
keywords: Chest physical therapy; Lung volume; Manual percussion; Metabolic status; Postural drainage