Limiar eletremiográfico da fadiga muscular em homens com peso normal e com sobrepeso

by Barbosa Maurício, Antonietta Cláudia

Abstract (Summary)
The purpose of this study was to verify differences in the patterns of electromyographicrecordings during muscle fatigue induced by handgrip isometric voluntary contraction, innormal weight and overweight voluntaries. Forty two male volunteers, age ranged 18 to 30years, healthy, non-smoking and non-athletes, classified by body mass index (BMI) weredistributed in three groups: control (n=16, BMI 18,5 ? 24,99 Kg/m2), grade I overweight(n=15, BMI 25 ? 29,99 Kg/m2) and grade II overweight (n=12, BMI 30 ? 39,99 Kg/m2). Afteranthropometric and muscle voluntary contraction (MVC) assessment, the volunteers weresubmitted to protocols of isometric handgrip with electromyographic (EMG) recordings at30% and 50% MVC. According to mean frequency and root mean square (RMS) data,graphics constructed shown the changes of these parameters by the time. These values wereused for statistical analysis using the One Way Analysis of Variance test, performed by SigmaStat 32, with level of significance plt; 0,05. The RMS maximal and endurance time werehigher between controls for 30% MVC. The time threshold (EMG fatigue threshold) waslower at overweight for 50% MVC. The results suggest that EMG fatigue threshold could bebetter found with accurate observation of mean frequency, which decreases and RMSincreases, at 50% of MVC. Our observations on the reduced endurance between obese suggesta trend of greater oxidative fibers hypertrophy in normal weight subjects than obese ones
This document abstract is also available in Portuguese.
Bibliographical Information:

Advisor:Milton Marcelino Filho; Alberto Galvão de Moura Filho

School:Universidade Federal de Pernambuco

School Location:Brazil

Source Type:Master's Thesis

Keywords:Limiareletromiográfico Electromyography Muscle fatigue Body mass index Electromyographic threshold Overweight


Date of Publication:05/27/2004

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