title: Walking and chewing reduce postprandial acid reflux.
abstract: BACKGROUND
  Gastro-oesophageal reflux is worse after meals, and antacids are usually consumed after dietary indiscretion.
  
  
  OBJECTIVE
  To investigate whether walking or gum chewing affect meal-induced gastro-oesophageal reflux.
  
  
  METHODS
  The study population comprised 12 case subjects with gastro-oesophageal reflux disease and 24 healthy controls. Each subject was studied using pH-metry for 5 h on 3 separate days. After baseline recording of pH for 1 h, all subjects were fed a standard breakfast over a 20-min period. On one of the days, oesophageal pH was recorded after the 20-min eating period for an additional 4 h in the sitting position. On another day, postprandial oesophageal pH was recorded for the first hour whilst walking, and for 3 subsequent hours whilst sitting. During a third day, oesophageal pH was recorded for the first postprandial hour whilst gum-chewing, followed by 3 h of sitting.
  
  
  RESULTS
  Food intake promoted gastro-oesophageal reflux in case subjects with GERD as well as in healthy controls, although postprandial reflux was more pronounced amongst the refluxers than amongst the controls. Chewing gum for 1 h after the meal reduced the acid contact time in both groups, with a more profound effect in refluxers than in controls. Whilst the beneficial effect of 1-h of gum-chewing lasted for up to 3 h in both groups, the beneficial effect of 1-h of walking was apparent only in refluxers, only to a mild degree, and only for a short duration.
  
  
  CONCLUSIONS
  Chewing gum after a meal helps to reduce postprandial oesophageal acid exposure.
authors.affiliation: Department of Veterans Affairs Medical Center, Albuquerque, New Mexico 87108, USA.
authors.forename: B
authors.initials: B
authors.lastname: Avidan
authors.forename: A
authors.initials: A
authors.lastname: Sonnenberg
authors.forename: T G
authors.initials: TG
authors.lastname: Schnell
authors.forename: S J
authors.initials: SJ
authors.lastname: Sontag
mesh_terms: D005260:Female; D005764:Gastroesophageal Reflux / Q000503:physiopathology / Q000517:prevention & control*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D008409:Mastication / Q000502:physiology*; D008875:Middle Aged; D019518:Postprandial Period; D016138:Walking / Q000502:physiology*