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Titolo:
A non-MVC EMG normalization technique for the trunk musculature: Part 1. Method development
Autore:
Marras, WS; Davis, KG;
Indirizzi:
Ohio State Univ, Biodynam Lab, Columbus, OH 43210 USA Ohio State Univ Columbus OH USA 43210 iodynam Lab, Columbus, OH 43210 USA
Titolo Testata:
JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
fascicolo: 1, volume: 11, anno: 2001,
pagine: 1 - 9
SICI:
1050-6411(200102)11:1<1:ANENTF>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
LOW-BACK-PAIN; MUSCLE STRENGTH; ISOMETRIC STRENGTH; HEALTHY-SUBJECTS; LATERAL FLEXION; LUMBAR FUNCTION; ISO-MACHINES; FORCE MODEL; QUANTIFICATION; ROTATION;
Keywords:
electromyography; spinal loading; anthropometry; strength; low back injury;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Marras, WS Ohio State Univ, Biodynam Lab, 210 Baker Syst,1971 Neil Ave, Columbus, OH 43210 USA Ohio State Univ 210 Baker Syst,1971 Neil Ave Columbus OH USA 43210
Citazione:
W.S. Marras e K.G. Davis, "A non-MVC EMG normalization technique for the trunk musculature: Part 1. Method development", J ELECTROMY, 11(1), 2001, pp. 1-9

Abstract

Normalization of muscle activity has been commonly used to determine the amount of force exerted by a muscle. The most widely used reference point for normalization is the maximum voluntary contraction (MVC). However, MVCs are often subjective, and potentially limited by sensation of pain in injured individuals. The objective of the current study was to develop a normalization technique that predicts an electromyographic (EMG) reference point from sub-maximal exertions. Regression equations predicting maximum exerted trunk moments were developed from anthropometric measurements of 120 subjects. In addition, 20 subjects performed sub-maximal and maximal exertions to determine the necessary characteristic exertions needed for normalization purposes. For most of the trunk muscles. a highly linear relationship was found between EMG muscle activity and trunk moment exerted. This analysis determined that an EMG-moment reference point can be obtained via a set of sub-maximal exertions in combination with a predicted maximal exertion (expected maximum contraction or EMC) based upon anthropometric measurements. Thisnormalization technique overcomes the limitations of the subjective naturefor the MVC method providing a viable assessment method of individuals with a low back injury or those unwilling to exert an MVC as well as could be extended to other joints/muscles. (C) 2001 Published by Elsevier Science Ltd.

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Documento generato il 29/01/20 alle ore 18:56:03