Human standing and walking: comparison of the effects of stimulation of the vestibular system.

Human standing and walking: comparison of the effects of stimulation of the vestibular system. Research Abstract Details 

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Human standing and walking: comparison of the effects of stimulation of the vestibular system. Abstract Text:

John F Iles,Richard Baderin,Rachel Tanner,Ariel Simon,John F Iles,Richard Baderin,Rachel Tanner,Ariel Simon,John F Iles,Richard Baderin,Rachel Tanner,Ariel Simon,

The adoption of bipedalism by hominids including man has complicated the tasks of balance control and the minimisation of body sway. We have investigated the role of the vestibular organs in controlling sway in the roll direction using galvanic vestibular stimulation (GVS). Two stance conditions were studied: during forward lean posterior compartment muscles are activated and during backward lean anterior compartment muscles are activated. GVS-evoked vestibular signals in stance control leg muscles as a group: all the active muscles in the leg on the GVS cathode side are excited together and those in the contralateral leg (anode side) relax. The subject sways towards the anode side. During treadmill walking, vestibular actions are subtly different: the actions are largely restricted to muscles acting at the ankle joint, occur at longer latencies, are not reciprocal in the opposite limb, are modulated throughout the step cycle (largest early in stance) and are reversed in sign in the peroneus longus muscle. The subject deviates towards the anode side. Hand contact with a firm object reduces GVS-evoked responses in leg muscles during treadmill walking. Responses to GVS are observed during over-ground walking but not significantly during bicycling on an ergometer. The observations suggest that these vestibular actions are part of a roll stabilisation mechanism. They may be mediated through different spinal premotor mechanisms during standing and walking and turned off during bicycling, when leg muscles have no balance control function.

Human standing and walking: comparison of the effects of stimulation of the vestibular system. Publishing Authors By Initials

JF Iles,R Baderin,R Tanner,A Simon,JF Iles,R Baderin,R Tanner,A Simon,JF Iles,R Baderin,R Tanner,A Simon,

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Human standing and walking: comparison of the effects of stimulation of the vestibular system. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Experimental brain research. Experimentelle Hirnf

VOLUME: 178

Page Numbers: 151-66

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ISSN: 0014-4819

DAY: 10

MONTH: 10

YEAR: 2006

Human standing and walking: comparison of the effects of stimulation of the vestibular system. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Human standing and walking: comparison of the effects of stimulation of the vestibular system.

AFFILIATION: Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK. john.iles@zoo.ox.ac.uk

Country: Germany

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MEDLINETA: Exp Brain Res

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