EMG power spectrum shifts of biceps brachii when acting as an antagonist

Author

Boissy, Patrick ; Gravel, Dave ; Bourbonnais, D.

Author_Institution

Inst. de Readaptation de Montreal, Centre de Recherche, Que.

Volume

2

fYear

1995

fDate

20-23 Sep 1995

Firstpage

1339

Abstract

EMG power spectrums of biceps brachii (BE) and triceps brachii (TB) when acting as antagonists were obtained during linearly increasing force ramp contractions. Mean BB median frequency (MF) shifted downward with increasing force levels up to 100% maximal voluntary contraction (MVC), possibly indicating a derecruitment of BB motor units. Polynomial regression between signal to noise ratios (SNRs) and MFs [r=0.94] of BB showed that at low force levels (10-40% MVC) large MF shifts are associated with a short range of small SNRs. This suggests that the initial large MF values of BB may be due to the high frequency content of heat noise and that the previously proposed derecruitment of motor units might not be solely responsible for the initial MF decrease

Keywords

electromyography; medical signal processing; spectral analysis; EMG power spectrum shifts; antagonist; antagonists; biceps brachii; elbow muscles; electrodiagnostics; force ramp contractions; heat noise; linearly increasing force ramp contractions; low force levels; maximal voluntary contraction; median frequency; polynomial regression; signal to noise ratios; Elbow; Electromyography; Force control; Force feedback; Frequency; Muscles; Polynomials; Recruitment; Signal processing; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 1995., IEEE 17th Annual Conference

Conference_Location

Montreal, Que.

Print_ISBN

0-7803-2475-7

Type

conf

DOI

10.1109/IEMBS.1995.579716

Filename

579716