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Effect of head extension on equilibrium in normal subjects.
Ann Otol Rhinol Laryngol. 1991 Jan; 100(1):63-7.AO

Abstract

A dynamic posturography system was used to test the effect of 55 degrees head extension on postural sway in 20 normal subjects. There was a highly significant increase in sway with head extension under two conditions; in both, the support surface moves proportionally to body sway angle (sway-referenced feedback). The largest increase in sway occurred when the eyes were closed and the support surface was sway-referenced. This latter condition removes vision, reduces the effectiveness of ankle proprioception, and forces the subject to depend mostly on vestibular information for equilibrium. We suggest that head extension increases sway because the utricular otoliths are put into a disadvantageous position. This may be another example of the role of utricular input in the control of balance.

Authors+Show Affiliations

Jackson RT
Rehabilitation Research and Development Center, Atlanta Veterans Administration Medical Center, GA.
Epstein CM
No affiliation info available

MeSH

AdultAgedFemaleHeadHumansMaleMiddle AgedOtolithic MembranePostural BalancePostureVision, Ocular

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

1985528

Citation

Jackson, R T., and C M. Epstein. "Effect of Head Extension On Equilibrium in Normal Subjects." The Annals of Otology, Rhinology, and Laryngology, vol. 100, no. 1, 1991, pp. 63-7.
Jackson RT, Epstein CM. Effect of head extension on equilibrium in normal subjects. Ann Otol Rhinol Laryngol. 1991;100(1):63-7.
Jackson, R. T., & Epstein, C. M. (1991). Effect of head extension on equilibrium in normal subjects. The Annals of Otology, Rhinology, and Laryngology, 100(1), 63-7.
Jackson RT, Epstein CM. Effect of Head Extension On Equilibrium in Normal Subjects. Ann Otol Rhinol Laryngol. 1991;100(1):63-7. PubMed PMID: 1985528.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of head extension on equilibrium in normal subjects. AU - Jackson,R T, AU - Epstein,C M, PY - 1991/1/1/pubmed PY - 1991/1/1/medline PY - 1991/1/1/entrez SP - 63 EP - 7 JF - The Annals of otology, rhinology, and laryngology JO - Ann Otol Rhinol Laryngol VL - 100 IS - 1 N2 - A dynamic posturography system was used to test the effect of 55 degrees head extension on postural sway in 20 normal subjects. There was a highly significant increase in sway with head extension under two conditions; in both, the support surface moves proportionally to body sway angle (sway-referenced feedback). The largest increase in sway occurred when the eyes were closed and the support surface was sway-referenced. This latter condition removes vision, reduces the effectiveness of ankle proprioception, and forces the subject to depend mostly on vestibular information for equilibrium. We suggest that head extension increases sway because the utricular otoliths are put into a disadvantageous position. This may be another example of the role of utricular input in the control of balance. SN - 0003-4894 UR - https://www.unboundmedicine.com/medline/citation/1985528/Effect_of_head_extension_on_equilibrium_in_normal_subjects_ DB - PRIME DP - Unbound Medicine ER -