title: Detecting spinal posture change in sitting positions with tri-axial accelerometers.
abstract: A method of using three tri-axial accelerometers for monitoring postural changes in sitting was introduced. Subjects were requested to perform forward trunk flexion and lateral bending. A motion analysis system and a three-dimensional rotation alignment device were used to verify the measurements of the accelerometers. The precision and reliability of the accelerometers for measuring static calibration was demonstrated as < or =1 degrees for the RMS error and 1.000 for ICC(3,1). For measurements of sitting posture, the averaged RMS difference between the measurements of the accelerometers and the motion analysis system were < or =5 degrees for all sitting postures on the coronal and sagittal planes. The results of this study demonstrated that tri-axial accelerometers could be used for tracking spinal postural changes on the sagittal and coronal planes in the sitting positions.
authors.affiliation: S103, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, PR China. allison.wong@polyu.edu.hk
authors.forename: Wai Yin
authors.initials: WY
authors.lastname: Wong
authors.forename: Man Sang
authors.initials: MS
authors.lastname: Wong
mesh_terms: D000054:Acceleration; D001696:Biomechanical Phenomena / Q000295:instrumentation; D005240:Feasibility Studies; D006801:Humans; D021621:Imaging, Three-Dimensional; D008159:Lumbar Vertebrae / Q000502:physiology; D008954:Models, Biological; D011187:Posture / Q000502:physiology*; D012399:Rotation; D013131:Spine / Q000502:physiology*; D013904:Thoracic Vertebrae / Q000502:physiology; D013909:Thorax / Q000502:physiology