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The effect of epoch length on time and frequency domain parameters of electromyographic and mechanomyographic signals

dc.contributor.authorKeller J.L.
dc.contributor.authorHoush T.J.
dc.contributor.authorCamic C.L.
dc.contributor.authorBergstrom H.C.
dc.contributor.authorSmith D.B.
dc.contributor.authorSmith C.M.
dc.contributor.authorHill E.C.
dc.contributor.authorSchmidt R.J.
dc.contributor.authorJohnson G.O.
dc.contributor.authorZuniga J.M.
dc.date.accessioned2020-09-02T22:21:07Z
dc.date.available2020-09-02T22:21:07Z
dc.date.issued2018
dc.identifier10.1016/j.jelekin.2018.04.003
dc.identifier.citation40, , 88-94
dc.identifier.issn10506411
dc.identifier.urihttps://hdl.handle.net/20.500.12728/5000
dc.descriptionThe selection of epoch lengths affects the time and frequency resolution of electromyographic (EMG) and mechanomyographic (MMG) signals, as well as decisions regarding the signal processing techniques to use for determining the power density spectrum. No previous studies, however, have examined the effects of epoch length on parameters of the MMG signal. The purpose of this study was to examine the differences between epoch lengths for EMG amplitude, EMG mean power frequency (MPF), MMG amplitude, and MMG MPF from the VL and VM muscles during MVIC muscle actions as well as at each 10% of the time to exhaustion (TTE) during a continuous isometric muscle action of the leg extensors at 50% of MVIC. During the MVIC trial, there were no significant (p > 0.05) differences between epoch lengths (0.25, 0.50, 1.00, and 2.00-s) for mean absolute values for any of the EMG or MMG parameters. During the submaximal, sustained muscle action, however, absolute MMG amplitude and MMG MPF were affected by the length of epoch. All epoch related differences were eliminated by normalizing the absolute values to MVIC. These findings supported normalizing EMG and MMG parameter values to MVIC and utilizing epoch lengths that ranged from 0.25 to 2.00-s. © 2018 Elsevier Ltd
dc.language.isoen
dc.publisherElsevier Ltd
dc.subjectEMG
dc.subjectEpoch length
dc.subjectMMG
dc.subjectadult
dc.subjectamplitude modulation
dc.subjectArticle
dc.subjectcontrolled study
dc.subjectelectromyography
dc.subjectepoch length
dc.subjectfemale
dc.subjecthuman
dc.subjecthuman experiment
dc.subjectisomeric muscle
dc.subjectleg extensor
dc.subjectleg movement
dc.subjectmale
dc.subjectmaximum voluntary isometric contraction
dc.subjectmean power frequency
dc.subjectmechanomyographic signals
dc.subjectmuscle
dc.subjectmuscle contraction
dc.subjectmyography
dc.subjectnormal human
dc.subjectparameters
dc.subjectpriority journal
dc.subjectsignal processing
dc.subjecttime to exhaustion
dc.subjectvastus lateralis muscle
dc.subjectvastus medialis muscle
dc.subjectbiomechanics
dc.subjectelectromyography
dc.subjectmuscle isometric contraction
dc.subjectphysiology
dc.subjectprocedures
dc.subjectskeletal muscle
dc.subjecttime factor
dc.subjecttorque
dc.subjectyoung adult
dc.subjectBiomechanical Phenomena
dc.subjectElectromyography
dc.subjectFemale
dc.subjectHumans
dc.subjectIsometric Contraction
dc.subjectMale
dc.subjectMuscle, Skeletal
dc.subjectSignal Processing, Computer-Assisted
dc.subjectTime Factors
dc.subjectTorque
dc.subjectYoung Adult
dc.titleThe effect of epoch length on time and frequency domain parameters of electromyographic and mechanomyographic signals
dc.typeArticle


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