title: Effects of voluntary and automatic control of center of pressure sway during quiet standing.
abstract: The authors investigated the effects of voluntary and automatic control on the spatial variables (envelope area, maximal amplitude, and root mean square [RMS]) of center of pressure (COP) displacement during quiet standing and identified differences in their postural control strategies (mean velocity [MV], mean power frequency [MPF], and power density). COP data were recorded under relaxed (experimental control), still (voluntary control), and dual (automatic control) conditions. RMS was significantly lower in the still and dual conditions than in the relaxed condition. MV, MPF, and power density were significantly higher in the still condition than in the dual condition. These results indicate that both voluntary and automatic control decrease the spatial variables of COP displacement; however, their postural control strategies are different.
authors.affiliation: a Department of Neurorehabilitation, Graduate School of Health Sciences , Kio University , Nara , Japan.
authors.forename: Kozo
authors.initials: K
authors.lastname: Ueta
authors.forename: Yohei
authors.initials: Y
authors.lastname: Okada
authors.forename: Hideki
authors.initials: H
authors.lastname: Nakano
authors.forename: Michihiro
authors.initials: M
authors.lastname: Osumi
authors.forename: Shu
authors.initials: S
authors.lastname: Morioka
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology; D004856:Postural Balance / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D011434:Proprioception / Q000502:physiology*; D055815:Young Adult
keywords: automatic control; center of pressure; postural control strategy; quiet standing; voluntary control