Analysis of standing posture in patients with bilateral loss of labyrinthine excitability.
The forward-backward and right-left sways in the upright standing posture were examined using stabilometry and analysis with a 5-dimensional feedback model. The forward-backward sway was found to have a fast, hidden periodicity, composed of sways due to a loss of the labyrinthine righting reflex upon the head and interaction between the head and knee sways. Furthermore, on the basis of our previous investigation, the forward-backward sway was found to depend on the increased spinal reflexes caused by a loss of labyrinthine inhibitory control upon the antigravity muscles. The right-left sway is slow and irregular, being mainly produced by disturbance of the head righting reflex.
Tokita
T
T
Department of Otorhinolaryngology, Gifu University School of Medicine, Japan.
Miyata
H
H
Takagi
K
K
D005246:Feedback; D006257:Head; D006801:Humans; D007759:Labyrinth Diseases / Q000503:physiopathology*; D011187:Posture / Q000502:physiology*; D012018:Reflex / Q000502:physiology; D013116:Spinal Cord / Q000503:physiopathology; D014722:Vestibule, Labyrinth / Q000502:physiology