Electromyographic activity during maximal isometric contraction combined with local sinusoidal vibration

• Authors: Jacielle Ferreira , Bruno Resende , João Soldati , João de Oliveira Claudino , Rafael Ribeiro , Bruno Couto , Leszek Szmuchrowski
• Languages of publication: EN

Abstracts

EN

Study aim: To compare the electromyographic activity during maximal isometric contraction alone or combined with local sinusoidal vibration.Material and methods: A group of 6 men aged 23 - 29 years performed 3 maximal voluntary contractions of the dominant elbow flexors lasting 10 s each and separated by 5-min intermissions. One repetition was without vibration, one was associated with 15-Hz and the other one with 20-Hz vibrations of 5-mm amplitude, the sequence of repetitions being random. A new system to generate local vibration was applied, the parameters of the vibratory stimulus being measured using an accelerometer. Force and EMG activity were also measured. The subjects performed the task in sitting position in a Scott Bench-type device.Results: Mean acceleration RMS significantly (p<0.01) differed between vibration frequencies for the X, Y, Z-axes. No significant differences were found, however, for EMG RMS. Vibration frequencies coincided with the machine-predicted ones; acceleration frequencies around 5 Hz were present in all situations, even without vibration, most likely brought about by tremor.Conclusion: The local vibration applied was not enough to generate different responses in EMG activity. The features of vibratory stimulus confirmed the expected frequency range and revealed frequencies around 5 Hz, that could be attributed to muscle tremor.

Keywords

EN

Sinusoidal vibration; Electromyographic activity; Isometric strength

• Publisher: Versita
• Journal: Biomedical Human Kinetics
• Year: 2011
• Volume: 3
• Pages: 35-38

Dates

published

1 - 1 - 2011

online

13 - 4 - 2011

Contributors

author

Jacielle Ferreira

• Federal University of Minas Gerais, Belo Horizonte MG, Brazil

author

Bruno Resende

• Federal University of Minas Gerais, Belo Horizonte MG, Brazil

author

João Soldati

• Federal University of Minas Gerais, Belo Horizonte MG, Brazil

author

João de Oliveira Claudino

• Federal University of Minas Gerais, Belo Horizonte MG, Brazil

author

Rafael Ribeiro

• Federal University of Minas Gerais, Belo Horizonte MG, Brazil

author

Bruno Couto

• Federal University of Minas Gerais, Belo Horizonte MG, Brazil

author

Leszek Szmuchrowski

• Federal University of Minas Gerais, Belo Horizonte MG, Brazil

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Identifiers

DOI

10.2478/v10101-011-0008-3