Cortical contributions to anticipatory postural adjustments in the trunk
File(s)
Accepted version
OA Location
Author(s)
Chiou, Shin-Yi
Hurry, Madeleine
Reed, Thomas
Quek, Jing Xiao
Strutton, Paul H
Type
Journal Article
Abstract
Voluntary limb movements are associated with increases in trunk muscle activity, some of which occur within a time window considered too fast to be induced by sensory feedback; these increases are termed anticipatory postural adjustments (APAs). Although it is known that the function of APAs is to maintain postural stability in response to perturbations, excitability of the corticospinal projections to the trunk muscles during the APAs remains unclear. Thirty‐four healthy subjects performed rapid shoulder flexion in response to a visual cue in standing and lying positions. Transcranial magnetic stimulation (TMS) was delivered over the trunk motor cortex to examine motor evoked potentials (MEPs) in erector spinae (ES) and in rectus abdominis (RA) muscles at several time points prior to the rise in electromyographic activity (EMG) of anterior deltoid (AD) muscle. TMS was also used to assess short‐interval intracortical inhibition (SICI) and cervicomedullary MEPs (CMEPs) in ES in the standing position. MEPs in ES were larger at time points closer to the rise in AD EMG in both standing and lying positions, whereas MEPs in RA did not differ over the time course examined. Notably, SICI was reduced at time points closer to the rise in AD EMG, with no change in CMEPs. Our results demonstrate that increasing excitability of corticospinal projections to the trunk muscles prior to a voluntary limb movement is likely to be cortical in origin and is muscle specific.
Date Issued
2018-02-25
Date Acceptance
2018-01-17
Citation
JOURNAL OF PHYSIOLOGY-LONDON, 2018, 596 (7), pp.1295-1306
ISSN
0022-3751
Publisher
Wiley
Start Page
1295
End Page
1306
Journal / Book Title
JOURNAL OF PHYSIOLOGY-LONDON
Volume
596
Issue
7
Copyright Statement
© 2018 The Authors. The Journal of Physiology © 2018 The Physiological Society. This is the accepted version of the following article:Chiou, S.‐Y., Hurry, M., Reed, T., Quek, J.X. and Strutton, P.H. (2018), Cortical contributions to anticipatory postural adjustments in the trunk. J Physiol, 596: 1295-1306, which has been published in final form at https://doi.org/10.1113/JP275312
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000428852500020&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Life Sciences & Biomedicine
Neurosciences
Physiology
Neurosciences & Neurology
cortical excitability
trunk muscles
anticipatory postural adjustments
LOW-BACK-PAIN
TRANSCRANIAL MAGNETIC STIMULATION
HUMAN CORTICOSPINAL EXCITABILITY
SUPPLEMENTARY MOTOR AREA
VOLUNTARY ARM MOVEMENTS
SIMPLE REACTION-TIME
BIOMECHANICAL ANALYSIS
PARKINSONS-DISEASE
PARABOLIC FLIGHT
LIMB MOVEMENT
Publication Status
Published
Date Publish Online
2018-01-24