title: [Muscle post-effects and upright standing in healthy subjects and patients with sensory-motor integration disorders].
abstract: We compared the upright standing in 7 patients with sensory-motor disorders and 7 healthy subjects (control) before and after 30-s involuntary neck muscle contraction. A trajectory of the center of pressure was recorded during 30-s standing with the eyes open, eyes closed and standing on a foam-rubber with the eyes open. As compared to healthy subjects, patients exhibited an increased body sway area during standing with the eyes open on both the firm surface and foam-rubber and a backward shift of the center of pressure during standing with the eyes both open and closed. Closing the eyes affected the upright standing of patients to a lesser extent than standing of healthy subjects. Involuntary neck muscle contraction within 30 s elicited a backward shift of the center of pressure in healthy subjects, especially during standing with the eyes closed, and a decrease in the length of the center-of-pressure trajectory, especially of its frontal component during standing on the foam-rubber. In patients, a post-effect of the neck muscle contraction manifested itself as a decrease in the body sway area during standing on the foam-rubber and relative increase in the frontal component of the center-of-pressure trajectory during standing with the eyes closed. The results suggest that the upright standing of patients with sensory-motor disorders is more sensitive to somatosensory than visual input, and 30-s neck muscle contraction approach their postural stability to the age-matched control.
authors.forename: V L
authors.initials: VL
authors.lastname: Talis
authors.forename: M A
authors.initials: MA
authors.lastname: Kapitonov
authors.forename: E V
authors.initials: EV
authors.lastname: Maksimova
mesh_terms: D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000503:physiopathology; D008297:Male; D009119:Muscle Contraction; D009334:Neck Muscles / Q000502:physiology / Q000503:physiopathology*; D010243:Paralysis / Q000503:physiopathology; D011187:Posture; D011597:Psychomotor Performance; D012678:Sensation Disorders / Q000503:physiopathology*; D055815:Young Adult