Effect of smoothing window length on RMS EMG amplitude estimates

Author

St-Amant, Yves ; Rancourt, Denis ; Clancy, Edward A.

Author_Institution

Dept. of Mech. Eng., Laval Univ., Que., Canada

fYear

1996

fDate

14-15 Mar 1996

Firstpage

93

Lastpage

94

Abstract

Describes the results of a study on the influence of smoothing window length on the signal-to-noise ratio (SNR) of electromyogram (EMG) amplitude estimates. In a previous experiment, surface EMG waveforms were recorded for non-fatiguing, constant-force, isometric contraction of the biceps and triceps muscles. Based on these data, four different EMG processors were studied using smoothing window length durations spanning 24-500 ms. Results show that the SNR increases in a square root fashion with smoothing window length, as predicted by classical theory. These results are useful in choosing the length of the smoothing window in traditional surface EMG studies, and to adaptively tune the smoothing window length when the EMG amplitude is time-varying

Keywords

electromyography; medical signal processing; smoothing methods; 24 to 500 ms; EMG signal-to-noise ratio; RMS EMG amplitude estimates; biceps; electrodiagnostics; nonfatiguing constant-force isometric contraction; smoothing window length effect; surface EMG waveforms; triceps; Amplitude estimation; Elbow; Electromyography; Filters; Health and safety; Mechanical engineering; Muscles; Road safety; Smoothing methods; Surface waves;

fLanguage

English

Publisher

ieee

Conference_Titel

Bioengineering Conference, 1996., Proceedings of the 1996 IEEE Twenty-Second Annual Northeast

Conference_Location

New Brunswick, NJ

Print_ISBN

0-7803-3204-0

Type

conf

DOI

10.1109/NEBC.1996.503233

Filename

503233