Study of motor unit activation pattern by an all poles model of the muscular sound

Bertrand Diemont, Marisa Maranzana Figini, Claudio Orizio, Renza Perini, Arsenio Veicsteinas

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Two types of motor units (MUs) can be found in the muscle: type I and type II, activated at low and high levels of contraction, respectively. The firing frequencies are roughly in the range of 8-18 Hz for type I and in the range of 15-30 Hz for type II MUs. An all-poles model is used to describe the dynamics of the soundmyogram (SMG), which is related to the mechanical activity of the excited muscle fibers. The SMG was recorded during isometric contractions lasting 4 s at 20% and 80% of the maximal voluntary contraction. The results show that at low contraction level a second-order autoregressive model, AR(2), is the optimal model, whereas at high contraction level the optimal model order is AR(4). The poles computed from the models reflect the activation patterns of the MUs.

Original languageEnglish
Title of host publicationIEEE/Engineering in Medicine and Biology Society Annual Conference
PublisherPubl by IEEE
Pages1700-1701
Number of pages2
Volume10 pt 4
Publication statusPublished - 1988
EventProceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society - New Orleans, LA, USA
Duration: Nov 4 1988Nov 7 1988

Other

OtherProceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society
CityNew Orleans, LA, USA
Period11/4/8811/7/88

ASJC Scopus subject areas

  • Engineering(all)

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