Effect of head extension on equilibrium in normal subjects.

@article{Jackson1991EffectOH,
  title={Effect of head extension on equilibrium in normal subjects.},
  author={Richard T. Jackson and Charles M. Epstein},
  journal={The Annals of otology, rhinology, and laryngology},
  year={1991},
  volume={100 1},
  pages={63-7}
}
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… CONTINUE READING