Reliability of surface electromyographic measurements from subjects with spinal cord injury during voluntary motor tasks

In this study, the reliability of surface electromyographic data (root-mean-square) for volitional motor tasks drawn from a standardized protocol was assessed. For each motor task, 5 s epochs of data were analyzed with a new method to generate a measure called the voluntary response index (VRI). The...

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Bibliographic Details
Published in:Journal of rehabilitation research and development 2005-07, Vol.42 (4), p.413-422
Main Authors: Lim, Hyun Kyoon, Sherwood, Arthur M
Format: Article
Language:English
Subjects:
Algorithms
Analysis of Variance
Data Compression - methods
Electromyography - standards
Female
Humans
Male
Middle Aged
Movement - physiology
Movement Disorders - diagnosis
Movement Disorders - etiology
Muscle Contraction - physiology
Muscular system
Nervous system
Reference Values
Rehabilitation
Reliability
Reproducibility of Results
Spinal cord injuries
Spinal Cord Injuries - complications
Volition - classification
Volition - physiology
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Summary:In this study, the reliability of surface electromyographic data (root-mean-square) for volitional motor tasks drawn from a standardized protocol was assessed. For each motor task, 5 s epochs of data were analyzed with a new method to generate a measure called the voluntary response index (VRI). The VRI consists of two components, magnitude and similarity index (SI), that were separately analyzed for repeatability. We examined three repetitions of each of 10 volitional motor tasks in 69 subjects with spinal cord injury (American Spinal Injury Association [ASIA] Impairment Scale [AIS], classifications C and D: 34 AIS-C and 35 AIS-D) for short-term (within-day) reliability. In 6 of the 69 subjects (3 each, AIS-C and AIS-D), the entire study was repeated after 1 week and results were assessed for intermediate-term (1 week apart) reliability. The reliability of the method for voluntary motor tasks was assessed by intraclass correlation coefficient (ICC), analysis of variance, coefficient of variance, and Pearson's correlation. Good reliability was found for magnitude (ICC = 0.71-0.99, Pearson's r = 0.77-0.99) and for SI (ICC = 0.65-0.96, Pearson's r = 0.72-0.93) for three repeated tests (within-day). Significant difference was found for studies completed 1 week apart for magnitude (p = 0.02) but not for SI (p = 0.57). In addition, SI showed less variation than magnitude (p < 0.001). No significant difference of magnitude and SI between tasks was observed.
ISSN:0748-7711
1938-1352
DOI:10.1682/JRRD.2004.07.0079