title: Mechanism of fluctuation in shear force applied to buttocks during reclining of back support on wheelchair.
abstract: OBJECTIVE
  The purpose of this study was to investigate the mechanism of the fluctuation in the shear force applied to the buttocks.
  
  
  METHODS
  The subjects were 11 healthy adult men without leg or trunk diseases. The amount of force applied to the buttocks was measured by using a force plate, and a pressure and shear force sensor was used to measure the timing of the force applied to the back support.
  
  
  RESULTS
  The average value of the shear force applied to the buttocks was 9.4 ± 2.4 (%BW) in the initial upright position (IUP), 9.3 ± 1.2 (%BW) in the fully reclined position (FRP), and 15.0 ± 2.9 (%BW) in the returning to an upright position (RUP). Significant differences appeared between the RUP and the other positions.
  
  
  CONCLUSIONS
  The results of this study suggested that the adjustment of the axes of rotation of the back support and trunk-pelvis and the release of the remaining shear force after the back support is reclined are important for the prevention of decubitus ulcers.
authors.affiliation: Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Kurashiki, 288 Matsushima, Okayama, Japan. rptkob@mw.kawasaki-m.ac.jp
authors.forename: Kenichi
authors.initials: K
authors.lastname: Kobara
authors.forename: Daisuke
authors.initials: D
authors.lastname: Fujita
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Osaka
authors.forename: Tomotaka
authors.initials: T
authors.lastname: Ito
authors.forename: Yousuke
authors.initials: Y
authors.lastname: Yoshimura
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ishida
authors.forename: Susumu
authors.initials: S
authors.lastname: Watanabe
mesh_terms: D000328:Adult; D001415:Back / Q000502:physiology*; D002081:Buttocks; D004867:Equipment Design; D006801:Humans; D008297:Male; D011187:Posture / Q000502:physiology*; D003668:Pressure Ulcer / Q000517:prevention & control; D013314:Stress, Mechanical; D016474:Weight-Bearing / Q000502:physiology*; D014910:Wheelchairs; D055815:Young Adult