NDLI: Analysis of various conditions in order to measure electromyography of isometric contractions in water and on air.

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Analysis of various conditions in order to measure electromyography of isometric contractions in water and on air.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Carvalho, Rodrigo Gustavo da Silva Amorim, César Ferreira Perácio, Luis Henrique Rossi Coelho, Helder Figueiredo Vieira, André Carleone Karl Menzel, Hans-Joachim Szmuchrowski, Leszek Antoni
Description	Country affiliation: Brazil Author Affiliation: Carvalho RG ( Department of Sports, School of Physical Education, Physiotherapy and Occupational Therapy, Laboratory of Load Evaluation, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.)
Abstract	The aim of this study was to verify if there are differences in the amplitude of signals from surface electromyography (EMG) during maximal and submaximal voluntary isometric contraction (MVC and 50% MVC, respectively) under different conditions, in our case, water and air, with and without extra protection (water-resistant tape) on the electrode. The isometric force and muscle activation of the MVC and 50% MVC of the biceps brachial muscle of nine healthy trained men were measured simultaneously, performed in water and on air, with and without protection of the EMG electrode. The multivariate analysis of variance with a post hoc Tukey test was applied to detect significant differences between the levels of muscular force. For the amplitude values of the EMG signal, the Wilcoxon signed rank test was applied to compare all experimental conditions in order to detect a significance of p<0.05. The values of isometric force were not significantly different among conditions (MVC and 50% MVC). The results showed a significant difference among conditions in the water without extra protection compared to the conditions on air with and without extra protection and in water with extra protection. Reduced EMG amplitude was seen in water without extra protection from 37.04% to 55.81% regarding the other conditions. However, no significant difference was seen among conditions in water with extra protection in relation the conditions on air (with and without extra protection). This study suggest that it is necessary to use a water-resistant tape as an extra protection on the electrode when using EMG underwater, to avoid having a significant decrease in the EMG amplitude underwater and not to suffer interference from the water. There was no significant difference among the recordings of EMG with and without the use of protection on air; therefore, the protection does not influence the recording of EMG amplitude and isometric force on air.
File Format	HTM / HTML
ISSN	10506411
Issue Number	5
Volume Number	20
e-ISSN	18735711
Journal	Journal of Electromyography and Kinesiology
Language	English
Publisher	Elsevier
Publisher Date	2010-10-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Cardiology Air Artifacts Electrodes Electromyography Instrumentation Isometric Contraction Physiology Muscle, Skeletal Water Methods Equipment Failure Analysis Humans Male Reproducibility Of Results Sensitivity And Specificity Young Adult Comparative Study Evaluation Studies Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Neuroscience Neurology (clinical) Biophysics Sports Science

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