Postural control during one-arm support standing: EMG characterization

Megan Moynahan, Ronald J. Triolo, Randal R. Betz

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Electromyography (EMG) characterization was performed on the postural muscles of standing paraplegic subjects. The subjects stood (with either functional neuromuscular stimulation or long leg braces) using one arm for support and performed simple arm-raising tasks with their free arm in response to a visual cue. EMG activity of the postural muscles (wrist extensors and flexors, biceps, triceps, and anterior deltoid) was examined and latencies measured with respect to the earliest voluntary EMG activity. Reaction times to the cueing signal were longer than values reported for able-bodied standers, possibly reflecting the increased postural requirement for paraplegic standers. Muscle sequencing tended to follow a distal-to-proximal ordering, with the distal muscles exhibiting anticipatory activity. The earliest postural reactions were 200-250 ms after the cue; 50-100 ms before the onset of voluntary activity.

Original languageEnglish
Title of host publicationProceedings of the Annual Conference on Engineering in Medicine and Biology
PublisherPubl by IEEE
Pages1811-1813
Number of pages3
Editionpt 4
ISBN (Print)0780302168
StatePublished - 1991
EventProceedings of the 13th Annual International Conference of the IEEE Engineering in Medicine and Biology Society - Orlando, FL, USA
Duration: 31 Oct 19913 Nov 1991

Publication series

NameProceedings of the Annual Conference on Engineering in Medicine and Biology
Numberpt 4
Volume13
ISSN (Print)0589-1019

Conference

ConferenceProceedings of the 13th Annual International Conference of the IEEE Engineering in Medicine and Biology Society
CityOrlando, FL, USA
Period31/10/913/11/91

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