| Maximal voluntary isometric contraction exercises: a methodological investigation in moderate knee osteoarthritis. | |
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MedLine Citation:
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PMID: 20926310 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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PURPOSE: The objectives were, (i) to determine whether differences exist in relative activation amplitudes for participants with asymptomatic knees and participants with moderate medial compartment knee osteoarthritis during a series of maximal effort contractions and (ii) to determine whether maximum activations occurred on similar exercises for both groups. SCOPE: Sixty-eight participants with asymptomatic knees and 68 participants with moderate medial compartment knee osteoarthritis completed eight standardized 3-s maximal voluntary isometric exercises. Maximal electromyographic amplitudes were identified for a 100 ms window from three quadriceps, two gastrocnemius and two hamstring muscle sites for each exercise. For each exercise, amplitudes were normalized to percent of the absolute maximum activation (%MVIC). Frequency counts for exercises eliciting absolute maximum amplitudes were recorded. Analysis of variance models determined exercise and group main effects and interactions in relative amplitudes (%MVIC) for each muscle. CONCLUSION: The exercises produced similar relative activation amplitudes between groups. The highest relative amplitude occurred for gastrocnemius during standing plantarflexion (86-93%MVIC), for the vasti during knee extension (45°) and (15°) (81-86%MVIC), for rectus femoris during knee extension (15°) (89%MVIC) and for hamstring muscles during knee flexion (15°) and prone knee flexion (55°) (81-94%MVIC). No single exercise elicited absolute maximum activation for every participant for each muscle, supporting the value of using an exercise series for normalization purposes. |
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Authors:
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Derek J Rutherford; Cheryl L Hubley-Kozey; William D Stanish |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology Volume: 21 ISSN: 1873-5711 ISO Abbreviation: J Electromyogr Kinesiol Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-01-14 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9109125 Medline TA: J Electromyogr Kinesiol Country: England |
Other Details:
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Languages: eng Pagination: 154-60 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 Elsevier Ltd. All rights reserved. |
Affiliation:
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School of Biomedical Engineering, Faculty of Engineering, Dalhousie University, Halifax, Nova Scotia, Canada. |
Export Citation:
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Descriptor/Qualifier:
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| Grant Support | |
ID/Acronym/Agency:
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//Canadian Institutes of Health Research |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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