title: Time-varying Changes in Pulmonary Function with Exposure to Prolonged Sitting.
abstract: OBJECTIVE
  The purpose of this study was to quantify the time-varying changes in pulmonary function with exposure to prolonged sitting.
  
  
  METHODS
  Twenty-one healthy volunteers were recruited. The pulmonary function of all participants was measured three times in order to assess changes over time; pulmonary function was measured before sitting, after participants had been seated for 1 hour, and after they had been seated for 2 hours. A spirometer was used to measure pulmonary function. The recorded values were forced vital capacity, forced expiratory volume in 1 second, ratio of forced expiratory volume in 1 second to forced vital capacity (forced expiratory volume in 1 second/forced vital capacity), and peak expiratory flow.
  
  
  RESULTS
  All measured values were significantly different before sitting and after 1 hour of sitting. There were also significant differences between all measurements taken before sitting and after 2 hours of sitting. However, the measurements taken after 1 hour and 2 hours of sitting did not significantly differ.
  
  
  CONCLUSIONS
  These findings suggest that significant changes in pulmonary function occur relatively quickly when human beings are seated.
authors.affiliation: Department of Physical Therapy, College of Health and Therapy, Daegu Haany University, Daegu, Korea.
authors.forename: Kyung Woo
authors.initials: KW
authors.lastname: Kang
authors.affiliation: Department of Physical Therapy, College of Health Science, Cheongju University, Cheongju, Korea.
authors.forename: Sung Min
authors.initials: SM
authors.lastname: Son
authors.affiliation: Department of Physical Therapy, Gangneung Yeongdong College, Gangneung, Korea.
authors.forename: Yu Min
authors.initials: YM
authors.lastname: Ko
keywords: prolonged sitting; pulmonary function; spirometer