Document Detail

Contribution of sensorimotor integration to spinal stabilization in humans.
MedLine Citation:
PMID:  19403751     Owner:  NLM     Status:  MEDLINE    
The control of upper body (UB) orientation relative to the pelvis in the frontal plane was characterized by analyzing responses to external perturbations consisting of continuous pelvis tilts (eyes open [EO] and eyes closed [EC]) and visual surround tilts (EO) at various amplitudes. Lateral sway of the lower body was prevented on all tests. UB sway was analyzed by calculating impulse-response functions (IRFs) and frequency-response functions (FRFs) from 0.023 to 10.3 Hz for pelvis tilt tests and FRFs from 0.041 to 1.5 Hz for visual tests. For pelvis tilt tests, differences between FRFs were limited to frequencies<3 Hz and were dependent on stimulus amplitude. IRFs were nearly identical across all pelvis tilt tests for the first 0.2 s, but showed amplitude-dependent changes in their time course at longer time lags. The availability of visual orientation cues (EO vs. EC) had only a small effect on the UB sway during pelvis tilt tests. This small effect of vision was consistent with the small UB sway evoked on visual tilt tests. Experimental results were interpreted using a feedback model of UB orientation control that included time-delayed sensory integration, short-latency reflexive mechanisms, and intrinsic biomechanical properties of the UB. Variation in model parameters indicated that subjects shifted toward reliance on vestibular information and away from proprioceptive information as pelvis tilt amplitudes increased. For visual tilt stimuli, model parameters indicated that subjects shifted toward reliance on vestibular and proprioceptive information and away from visual information as the stimulus amplitude increased.
Adam D Goodworth; Robert J Peterka
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2009-04-29
Journal Detail:
Title:  Journal of neurophysiology     Volume:  102     ISSN:  0022-3077     ISO Abbreviation:  J. Neurophysiol.     Publication Date:  2009 Jul 
Date Detail:
Created Date:  2009-06-30     Completed Date:  2009-09-10     Revised Date:  2013-06-02    
Medline Journal Info:
Nlm Unique ID:  0375404     Medline TA:  J Neurophysiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  496-512     Citation Subset:  IM    
Department of Science and Engineering, Oregon Health & Science University, Portland, OR, USA.
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MeSH Terms
Adaptation, Physiological
Models, Biological
Pelvis / innervation
Photic Stimulation / methods
Postural Balance / physiology*
Predictive Value of Tests
Proprioception / physiology*
Reaction Time / physiology
Sensation / physiology*
Spinal Cord / physiology*
Visual Fields / physiology
Young Adult
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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