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Does upper-limb muscular demand differ between preferred and nonpreferred sitting pivot transfer directions in individuals with a spinal cord injury?

Gagnon, D and Koontz, AM and Brindle, E and Boninger, ML and Cooper, RA (2009) Does upper-limb muscular demand differ between preferred and nonpreferred sitting pivot transfer directions in individuals with a spinal cord injury? Journal of Rehabilitation Research and Development, 46 (9). 1099 - 1108. ISSN 0748-7711

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Abstract

This study's main objective was to determine if upper-limb (UL) muscular demand was reduced when individuals with a spinal cord injury (SCI) performed a sitting pivot transfer (SPT) in the preferred direction compared with that in a nonpreferred direction. Fourteen individuals (mean +/-standard deviation age 47.0 +/- 8.3 yr, height 1.80 +/- 0.08 m, and weight 75.3 +/- 11.3 kg) with SCI levels ranging from the sixth cervical to first sacral vertebra levels volunteered to participate in this study during the 2008 National Disabled Veterans Winter Sports Clinic. Surface electromyography (EMG) was used to record activity of the biceps, triceps, deltoid, pectoralis major, trapezius, and latissimus dorsi bilaterally during SPTs. These transfers were performed in each of the preferred and nonpreferred directions from the individuals' wheelchairs to a padded tub bench of even height. To quantify electromyographic muscular utilization ratio (MUR ), we normalized EMG data recorded during the transfer tasks to values obtained during static maximum voluntary contraction and then multiplied this ratio by 100 to obtain a percentage MUR (%MUR ). The overall peak %MUR and the area under the %MUR curve were selected as primary outcome measures. Similar peak %MUR were found between the preferred and nonpreferred transfer directions for all muscles from which data were recorded (p = 0.053 to 0.961). The peak %MUR were also found to be similar between the leading and trailing ULs during the transfers in all muscles from which data were recorded (p = 0.125 to 0.838), except for the anterior deltoid, which was found to be solicited the most in the trailing UL (p = 0.008). Comparable areas under the %MUR curves were calculated between the preferred and nonpreferred transfer directions for all muscles (p = 0.289 to 0.678) and between the leading and trailing ULs (p = 0.104 to 0.946). These results indicate that direction preference expressed by individuals with SCI when transferring between seats of even height is not explained by relative muscular demand differences. EMG EMG EMG EMG EMG EMGs EMGs EMG


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Gagnon, D
Koontz, AMakoontz@pitt.eduAKOONTZ
Brindle, E
Boninger, MLboninger@pitt.eduBONINGER
Cooper, RARCOOPER@pitt.eduRCOOPER
Centers: Other Centers, Institutes, Offices, or Units > Human Engineering Research Laboratories
Date: 1 December 2009
Date Type: Publication
Journal or Publication Title: Journal of Rehabilitation Research and Development
Volume: 46
Number: 9
Page Range: 1099 - 1108
DOI or Unique Handle: 10.1682/jrrd.2009.02.0012
Schools and Programs: School of Health and Rehabilitation Sciences > Rehabilitation Science and Technology
Refereed: Yes
ISSN: 0748-7711
MeSH Headings: Activities of Daily Living; Adult; Electromyography; Female; Humans; Locomotion--physiology; Male; Middle Aged; Patient Preference; Spinal Cord Injuries--physiopathology; Task Performance and Analysis; Upper Extremity--physiology; Weight-Bearing
PubMed ID: 20437316
Date Deposited: 03 Oct 2012 21:40
Last Modified: 30 Mar 2021 13:55
URI: http://d-scholarship.pitt.edu/id/eprint/14715

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