Velocity dependence of vestibular information for postural control on tilting surfaces

Fay Horak, Joann Kluzik, Frantisek Hlavacka

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Vestibular information is known to be important for postural stability on tilting surfaces, but the relative importance of vestibular information across a wide range of surface tilt velocities is less clear. We compared how tilt velocity influences postural orientation and stability in nine subjects with bilateral vestibular loss and nine age-matched, control subjects. Subjects stood on a force platform that tilted 6 deg, toes-up at eight velocities (0.25 to 32 deg/s), with and without vision. Results showed that visual information effectively compensated for lack of vestibular information at all tilt velocities. However, with eyes closed, subjects with vestibular loss were most unstable within a critical tilt velocity range of 2 to 8 deg/s. Subjects with vestibular deficiency lost their balance in more than 90% of trials during the 4 deg/s condition, but never fell during slower tilts (0.25–1 deg/s) and fell only very rarely during faster tilts (16–32 deg/s). At the critical velocity range in which falls occurred, the body center of mass stayed aligned with respect to the surface, onset of ankle dorsiflexion was delayed, and there was delayed or absent gastrocnemius inhibition, suggesting that subjects were attempting to actively align their upper bodies with respect to the moving surface instead of to gravity. Vestibular information may be critical for stability at velocities of 2 to 8 deg/s because postural sway above 2 deg/s may be too fast to elicit stabilizing responses through the graviceptive somatosensory system, and postural sway below 8 deg/s may be too slow for somatosensory-triggered responses or passive stabilization from trunk inertia.

Original languageEnglish (US)
Pages (from-to)1468-1479
Number of pages12
JournalJournal of Neurophysiology
Volume116
Issue number3
DOIs
StatePublished - Sep 1 2016

Fingerprint

Gravitation
Toes
Ankle
Inhibition (Psychology)
Bilateral Vestibulopathy

Keywords

  • Human
  • Postural stability
  • Proprioception
  • Somatosensory
  • Surface tilt
  • Vestibular

ASJC Scopus subject areas

  • Neuroscience(all)
  • Physiology

Cite this

Velocity dependence of vestibular information for postural control on tilting surfaces. / Horak, Fay; Kluzik, Joann; Hlavacka, Frantisek.

In: Journal of Neurophysiology, Vol. 116, No. 3, 01.09.2016, p. 1468-1479.

Research output: Contribution to journalArticle

Horak, Fay ; Kluzik, Joann ; Hlavacka, Frantisek. / Velocity dependence of vestibular information for postural control on tilting surfaces. In: Journal of Neurophysiology. 2016 ; Vol. 116, No. 3. pp. 1468-1479.
@article{646503d09f4d4d48baf2b62b0c42531b,
title = "Velocity dependence of vestibular information for postural control on tilting surfaces",
abstract = "Vestibular information is known to be important for postural stability on tilting surfaces, but the relative importance of vestibular information across a wide range of surface tilt velocities is less clear. We compared how tilt velocity influences postural orientation and stability in nine subjects with bilateral vestibular loss and nine age-matched, control subjects. Subjects stood on a force platform that tilted 6 deg, toes-up at eight velocities (0.25 to 32 deg/s), with and without vision. Results showed that visual information effectively compensated for lack of vestibular information at all tilt velocities. However, with eyes closed, subjects with vestibular loss were most unstable within a critical tilt velocity range of 2 to 8 deg/s. Subjects with vestibular deficiency lost their balance in more than 90{\%} of trials during the 4 deg/s condition, but never fell during slower tilts (0.25–1 deg/s) and fell only very rarely during faster tilts (16–32 deg/s). At the critical velocity range in which falls occurred, the body center of mass stayed aligned with respect to the surface, onset of ankle dorsiflexion was delayed, and there was delayed or absent gastrocnemius inhibition, suggesting that subjects were attempting to actively align their upper bodies with respect to the moving surface instead of to gravity. Vestibular information may be critical for stability at velocities of 2 to 8 deg/s because postural sway above 2 deg/s may be too fast to elicit stabilizing responses through the graviceptive somatosensory system, and postural sway below 8 deg/s may be too slow for somatosensory-triggered responses or passive stabilization from trunk inertia.",
keywords = "Human, Postural stability, Proprioception, Somatosensory, Surface tilt, Vestibular",
author = "Fay Horak and Joann Kluzik and Frantisek Hlavacka",
year = "2016",
month = "9",
day = "1",
doi = "10.1152/jn.00057.2016",
language = "English (US)",
volume = "116",
pages = "1468--1479",
journal = "Journal of Neurophysiology",
issn = "0022-3077",
publisher = "American Physiological Society",
number = "3",

}

TY - JOUR

T1 - Velocity dependence of vestibular information for postural control on tilting surfaces

AU - Horak, Fay

AU - Kluzik, Joann

AU - Hlavacka, Frantisek

PY - 2016/9/1

Y1 - 2016/9/1

N2 - Vestibular information is known to be important for postural stability on tilting surfaces, but the relative importance of vestibular information across a wide range of surface tilt velocities is less clear. We compared how tilt velocity influences postural orientation and stability in nine subjects with bilateral vestibular loss and nine age-matched, control subjects. Subjects stood on a force platform that tilted 6 deg, toes-up at eight velocities (0.25 to 32 deg/s), with and without vision. Results showed that visual information effectively compensated for lack of vestibular information at all tilt velocities. However, with eyes closed, subjects with vestibular loss were most unstable within a critical tilt velocity range of 2 to 8 deg/s. Subjects with vestibular deficiency lost their balance in more than 90% of trials during the 4 deg/s condition, but never fell during slower tilts (0.25–1 deg/s) and fell only very rarely during faster tilts (16–32 deg/s). At the critical velocity range in which falls occurred, the body center of mass stayed aligned with respect to the surface, onset of ankle dorsiflexion was delayed, and there was delayed or absent gastrocnemius inhibition, suggesting that subjects were attempting to actively align their upper bodies with respect to the moving surface instead of to gravity. Vestibular information may be critical for stability at velocities of 2 to 8 deg/s because postural sway above 2 deg/s may be too fast to elicit stabilizing responses through the graviceptive somatosensory system, and postural sway below 8 deg/s may be too slow for somatosensory-triggered responses or passive stabilization from trunk inertia.

AB - Vestibular information is known to be important for postural stability on tilting surfaces, but the relative importance of vestibular information across a wide range of surface tilt velocities is less clear. We compared how tilt velocity influences postural orientation and stability in nine subjects with bilateral vestibular loss and nine age-matched, control subjects. Subjects stood on a force platform that tilted 6 deg, toes-up at eight velocities (0.25 to 32 deg/s), with and without vision. Results showed that visual information effectively compensated for lack of vestibular information at all tilt velocities. However, with eyes closed, subjects with vestibular loss were most unstable within a critical tilt velocity range of 2 to 8 deg/s. Subjects with vestibular deficiency lost their balance in more than 90% of trials during the 4 deg/s condition, but never fell during slower tilts (0.25–1 deg/s) and fell only very rarely during faster tilts (16–32 deg/s). At the critical velocity range in which falls occurred, the body center of mass stayed aligned with respect to the surface, onset of ankle dorsiflexion was delayed, and there was delayed or absent gastrocnemius inhibition, suggesting that subjects were attempting to actively align their upper bodies with respect to the moving surface instead of to gravity. Vestibular information may be critical for stability at velocities of 2 to 8 deg/s because postural sway above 2 deg/s may be too fast to elicit stabilizing responses through the graviceptive somatosensory system, and postural sway below 8 deg/s may be too slow for somatosensory-triggered responses or passive stabilization from trunk inertia.

KW - Human

KW - Postural stability

KW - Proprioception

KW - Somatosensory

KW - Surface tilt

KW - Vestibular

UR - http://www.scopus.com/inward/record.url?scp=84988640353&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84988640353&partnerID=8YFLogxK

U2 - 10.1152/jn.00057.2016

DO - 10.1152/jn.00057.2016

M3 - Article

C2 - 27486101

AN - SCOPUS:84988640353

VL - 116

SP - 1468

EP - 1479

JO - Journal of Neurophysiology

JF - Journal of Neurophysiology

SN - 0022-3077

IS - 3

ER -