title: Power spectrum characteristics of sway position and velocity of the center of pressure during static upright posture for healthy people.
abstract: This study assessed sex and individual differences in sway-position and velocity power spectra and reliability of power frequency with 30 health young people. The body sway for 1 min. was measured twice over a 1-min. rest. There were no significant sex differences in the spectra. Frequency bands with a large coefficient of variance over 10.0 appeared up to 0.6 Hz. 75% relative accumulated power frequency appeared at 1.10-1.23 Hz in the position and at 2.00-3.05 Hz in the velocity spectra. Most power was in the low frequency band (A and B frequency intervals) of the international standard. Relative accumulated power frequency of position and velocity power spectra was reasonably reliable. It may be necessary to establish a new evaluation frequency interval by direction of sway-position and velocity using relative accumulated power frequency for healthy people.
authors.affiliation: Graduate School of Natural Science and Technology, Kanazawa University, Japan. demuken@ed.kanazawa-u.ac.jp
authors.forename: Shinichi
authors.initials: S
authors.lastname: Demura
authors.forename: Tamotsu
authors.initials: T
authors.lastname: Kitabayashi
authors.forename: Masahiro
authors.initials: M
authors.lastname: Noda
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001824:Body Constitution / Q000502:physiology; D005260:Female; D005583:Fourier Analysis; D006801:Humans; D007206:Individuality; D008297:Male; D009038:Motion; D010507:Periodicity; D004856:Postural Balance / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D011312:Pressure; D011434:Proprioception / Q000502:physiology; D015203:Reproducibility of Results; D012737:Sex Factors; D014724:Vestibular Function Tests / Q000706:statistics & numerical data; D014722:Vestibule, Labyrinth / Q000502:physiology