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Appears in Collections:Faculty of Health Sciences and Sport Journal Articles
Peer Review Status: Refereed
Title: Surface EMG characteristics of people with multiple sclerosis during static contractions of the knee extensors
Author(s): Scott, Sasha Margaret
Hughes, Adrienne R
Galloway, S D
Hunter, Angus
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Keywords: maximal voluntary contraction
muscle fibre
Issue Date: Jan-2011
Citation: Scott SM, Hughes AR, Galloway SD & Hunter A (2011) Surface EMG characteristics of people with multiple sclerosis during static contractions of the knee extensors, Clinical Physiology and Functional Imaging, 31 (1), pp. 11-17.
Abstract: Objectives: This study was designed to determine whether any alterations existed in surface electromyography (sEMG) in people with multiple sclerosis (MS) during isometric contractions of the knee extensors. Methods: Fifteen people with MS and 14 matched controls (mean ± SD age and body mass index 53Æ7 ± 10Æ5 versus 54Æ6 ± 9Æ6 years and 27Æ7 ± 6Æ1 versus 26Æ5 ± 4, respectively) completed 20%, 40%, 60% and 80% of their maximal voluntary contraction (MVC) of the knee extensors. sEMG was recorded from the vastus lateralis where muscle fibre conduction velocity (MFCV) and sEMG amplitude (RMS) were assessed. Body composition was determined using dual-energy X-ray absorptiometry and physical activity with the use of accelerometry. Results: People with MS showed significantly (P < 0Æ05) faster MFCV during MVC (6Æ6 ± 2Æ7 versus 4Æ7 ± 1Æ4 m s)1) and all submaximal contractions, while RMS was significantly (P < 0Æ05) less (0Æ11 ± 0Æ03 versus 0Æ24 ± 0Æ06 mV) in compar- ison with the controls. MVC along with specific thigh lean mass to torque, rate of force development and mean physical activity were significantly (P < 0Æ01) less in PwMS. Conclusion: People with MS have elevated MFCV alongside reduced RMS during isometric contraction. This elevation in MFCV should be accounted for when interpreting sEMG from people with MS.
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