Article

There is evidence that patients with psychotic conditions display greater center
of pressure (CoP) displacement during quite standing than healthy subjects, but
the underlying impairments in the control mechanisms are uncertain. The aim of
this study was to identify the nature of possible impairments in the control of
posture by modulation of visual and kinesthetic information during quiet
standing. Center of pressure (CoP) data and whole-body kinematics of the center
of mass (CoM) were recorded during quite standing on a firm surface with eyes
open and with eyes closed, and standing with eyes open on a yielding surface.
During all three conditions, patients displayed greater migration of CoM and
CoP-CoM, a measure related to ankle joint torque, whereas CoP-frequency (MPF) was
similar in patients and healthy subjects. Our results suggested that greater
postural sway in patients may depend on disproportionally large ankle joint
torque without corresponding increase in frequency. Furthermore, interactions
between groups and conditions suggested that the patients made less use of visual
information for postural control than the healthy subjects.
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Langue : ANGLAIS