Motor unit firing rates and synchronisation affect the fractal dimension of simulated surface electromyogram during isometric/isotonic contraction of vastus lateralis muscle.

Abstract:

:During fatiguing contractions, many adjustments in motor units behaviour occur: decrease in muscle fibre conduction velocity; increase in motor units synchronisation; modulation of motor units firing rate; increase in variability of motor units inter-spike interval. We simulated the influence of all these adjustments on synthetic EMG signals in isometric/isotonic conditions. The fractal dimension of the EMG signal was found mainly influenced by motor units firing behaviour, being affected by both firing rate and synchronisation level, and least affected by muscle fibre conduction velocity. None of the calculated EMG indices was able to discriminate between firing rate and motor units synchronisation.

journal_name

Med Eng Phys

authors

Mesin L,Dardanello D,Rainoldi A,Boccia G

doi

10.1016/j.medengphy.2016.09.022

subject

Has Abstract

pub_date

2016-12-01 00:00:00

pages

1530-1533

issue

12

eissn

1350-4533

issn

1873-4030

pii

S1350-4533(16)30222-3

journal_volume

38

pub_type

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