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Surface electromyography activity of trunk muscles during wheelchair propulsion

Yang, YS and Koontz, AM and Triolo, RJ and Mercer, JL and Boninger, ML (2006) Surface electromyography activity of trunk muscles during wheelchair propulsion. Clinical Biomechanics, 21 (10). 1032 - 1041. ISSN 0268-0033

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Background: Trunk instability due to paralysis can have adverse effects on posture and function in a wheelchair. The purpose of this study was to record trunk muscle recruitment patterns using surface electromyography from unimpaired individuals during wheelchair propulsion under various propulsion speed conditions to be able to design trunk muscle stimulation patterns for actual wheelchair users with spinal cord injury. Methods: Fourteen unimpaired subjects propelled a test wheelchair on a dynamometer system at two steady state speeds of 0.9 m/s and 1.8 m/s and acceleration from rest to their maximum speed. Lower back/abdominal surface electromyography and upper body movements were recorded for each trial. Based on the hand movement during propulsion, the propulsive cycle was further divided into five stages to describe the activation patterns. Findings: Both abdominal and back muscle groups revealed significantly higher activation at early push and pre-push stages when compared to the other three stages of the propulsion phase. With increasing propulsive speed, trunk muscles showed increased activation (P < 0.0001). Back muscle activity was significantly higher than abdominal muscle activity across the three speed conditions (P < 0.0005), with lower back muscles predominating. Interpretation: Abdominal and back muscle groups cocontracted at late recovery phase and early push phase to provide sufficient trunk stability to meet the demands of propulsion. This study provides an indication of the amount and duration of stimulation needed for a future application of electrical stimulation of the trunk musculature for persons with spinal cord injury. © 2006 Elsevier Ltd. All rights reserved.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Yang, YS
Koontz, AMakoontz@pitt.eduAKOONTZ
Triolo, RJ
Mercer, JL
Boninger, MLboninger@pitt.eduBONINGER0000-0001-6966-919X
Centers: Other Centers, Institutes, Offices, or Units > Human Engineering Research Laboratories
Date: 1 December 2006
Date Type: Publication
Journal or Publication Title: Clinical Biomechanics
Volume: 21
Number: 10
Page Range: 1032 - 1041
DOI or Unique Handle: 10.1016/j.clinbiomech.2006.07.006
Schools and Programs: School of Health and Rehabilitation Sciences > Rehabilitation Science and Technology
Refereed: Yes
ISSN: 0268-0033
MeSH Headings: Abdominal Muscles--physiology; Adult; Back--physiology; Electromyography--methods; Female; Humans; Male; Muscle Contraction--physiology; Muscle, Skeletal--physiology; Physical Exertion--physiology; Postural Balance--physiology; Posture--physiology; Wheelchairs
PubMed ID: 16979271
Date Deposited: 04 Oct 2012 14:01
Last Modified: 01 Sep 2023 14:55


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