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Arquivos de Neuro-Psiquiatria

Print version ISSN 0004-282X

Arq. Neuro-Psiquiatr. vol.41 no.3 São Paulo Sept. 1983

http://dx.doi.org/10.1590/S0004-282X1983000300003 

Evaluacion del factor central y periferico en fatiga muscular

 

Evaluation of central and peripheric factors in muscular fatigue

 

 

Marcela E. Panizza; L. G. Cohen; Olga P. Sanz; R. Rey; C. Schutz

Sección de Electroneurofisiología Clínica, Hospital Ramos Mejía. Buenos Aires, Argentina

 

 


RESUMEN

Se estúdio la fatiga muscular en 13 sujetos normales; para ello, fueron sometidos a un esfuerzo sostenido durante 10 minutos previo y posterior, al cual se realizo la medición de la onda M máxima. Durante el esfuerzo y cada 2 minutos, se obtuvieron cuantificaciones de la frecuencia y duración de las ondas positivas y negativas del EMG. Los resultados, mostraron diferencias significativas de estos valores, en función del tiempo de esfuerzo realizado, mientras que las mediciones de la onda M máxima inicial y final, no fueron diferentes, todo lo cual lleva a jerarquizar el factor central como el más importante en el desarrollo de fatiga, bajo nuestras condiciones de estudio, que son además de sencilla aplicación clínica.


SUMMARY

Muscular fatigue was investigated in 13 healthy people by employing a simple device which comprises a computer on line with a conventional EMG equipment able to automatically measure the frequency and duration of free-run EMG recording. The procedure was carried out in the extensor digitorum brevis muscle by using surface electrodes throughout 10 minutes of voluntary maximal effort. The maximal M wave as well as the muscle response to repetitive nerve maximal stimulation was also explored at the beginning and at the end of the experiment. It was observed a decrease of the potentials frequency discharge and an increase of their duration without major changes in the M wave amplitude neither in the muscle response to the repetitive nerve discharge. The findings pointed out to the central factors as the main responsible for the development of muscular fatigue.


 

 

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

 

 

REFERENCIAS

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Sección de Electvoneurofisiología Clínica, Departamento de Neurología, Hospital Ramos Mejía - Urquiza 609 - 1221, Buenos Aires, Argentina.

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