title: Postural control in quiet standing with a concurrent cognitive task in psychotic conditions.
abstract: Differences in postural control and performance between psychotic patients and healthy subjects were investigated using a dual task paradigm. Center of pressure (CoP) data and whole-body kinematics of the center of mass (CoM) were recorded during quiet standing with and without a backward counting task. Dual task response was similar in both groups: the magnitude of CoM-migration did not change, while CoP-CoM magnitude, a measure related to ankle joint torque, and CoP-frequency both increased. The magnitudes of migration for CoM and CoP-CoM were greater in patients during both conditions, while CoP-frequency was similar to control subjects. Our results suggest that exaggerated ankle joint torque relative to CoP-frequency caused greater postural sway in patients during both conditions.
authors.affiliation: Faculty of Health Education and Social Work, Physiotherap, Sør-Trøndelag University College, Trondheim, Norway. annkatrin.stensdotter@hist.no
authors.forename: Ann-Katrin
authors.initials: AK
authors.lastname: Stensdotter
authors.forename: Anne Kristin
authors.initials: AK
authors.lastname: Wanvik
authors.forename: Håvard W
authors.initials: HW
authors.lastname: Lorås
mesh_terms: D000328:Adult; D000842:Ankle / Q000502:physiology; D001696:Biomechanical Phenomena / Q000502:physiology; D016022:Case-Control Studies; D003071:Cognition / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D004856:Postural Balance / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology*; D011618:Psychotic Disorders / Q000503:physiopathology* / Q000523:psychology*