Graduate Thesis Or Dissertation
 

An electromyographic approach to motor unit activity during sustained isometric contractions

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  • Eight male college students served as subjects in an investigation to establish a procedural model for research of individual motor units during sustained isometric contractions. Teca TE-4 electromyograph system with needle electrode provided electrical potential recordings from active muscle fibers in the right biceps. Various experimental procedures were tested to produce necessary electromyogram clarity for identification of individual motor unit potentials and measurement of their frequency and amplitude. Established procedures utilized 7 to 10% maximum contraction with stabilization of subject's body position to prevent movement, elimination of electrical interference in and around testing room, and careful placement of needle electrode. Pre-fatigue electrical activity was recorded during the first minute into the contraction. Three post-fatigue recordings were taken at one-minute intervals beginning ten minutes after prefatigue recordings. Suitability of the model was determined by quality of electromyogram recordings. EMG traces allowing motor unit evaluation by the application of Student's t-test for changes occurring in frequency and amplitude reflected model acceptability. A model was produced which permitted evaluation of motor units during sustained isometric contractions.
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  • File scanned at 300 ppi (Monochrome, 8-bit Grayscale) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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