title: Age-stage differences in body sway during a static upright posture based on sway factors and relative accumulation of power frequency.
abstract: This study was done to examine age-stage (preschool children, young adults, and elderly people) differences in the center-of-pressure sway using body-sway factors (unit-time sway, front-back sway, left-right sway, and high frequency-band power), power-spectrum distribution, and relative accumulation of power frequency (25%, 50%, and 75% RAPF) of the center-of-pressure spectrum. The center-of-pressure movement for 1 min. was measured twice using Anima's stabilometer. Data-sampling frequency was set at 20 Hz. Significant age-stage differences were found for 3 factors except for left-right sway, which was larger for preschool children and elderly than for young adults. The power spectrum of body sway in any age-stage was noted mainly in low frequency bands. A marked age-stage difference was found at 75% RAPF. Body-sway characteristics in each age-stage differ, and differences of postural-sway frequency are marked in the low frequency bands.
authors.affiliation: Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan. demuken@ed.kanazawa-u.ac.jp
authors.forename: Shin-Ichi
authors.initials: S
authors.lastname: Demura
authors.forename: Tamotsu
authors.initials: T
authors.lastname: Kitabayashi
authors.forename: Masahiro
authors.initials: M
authors.lastname: Noda
authors.forename: Hiroki
authors.initials: H
authors.lastname: Aoki
mesh_terms: D000367:Age Factors; D000368:Aged; D000375:Aging / Q000502:physiology*; D001696:Biomechanical Phenomena; D002648:Child; D006801:Humans; D004856:Postural Balance / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D011434:Proprioception / Q000502:physiology*; D014724:Vestibular Function Tests / Q000706:statistics & numerical data; D055815:Young Adult