Search results for "Multichannel EMG"

showing 2 items of 2 documents

Multi-channel electromyography during maximal isometric and dynamic contractions.

2013

Motor unit behavior differs between contraction types at submaximal contraction levels, however is challenging to study during maximal voluntary contractions (MVCs). With multi-channel surface electromyography (sEMG), mean physiological characteristics of the active motor units can be extracted. Two 8-electrode sEMG arrays were attached on biceps brachii muscle (one on each head) to examine behavior of sEMG variables during isometric, eccentric and concentric MVCs of elbow flexors in 36 volunteers. On average, isometric (364 ± 88N) and eccentric (353 ± 74N) MVCs were higher than concentric (290 ± 73N) MVC (p0.001). Mean muscle fiber conduction velocity (CV) was highest during eccentric MVC …

AdultMalemedicine.medical_specialtyContraction (grammar)ElbowPhysical ExertionBiophysicsNeuroscience (miscellaneous)Action PotentialsIsometric exerciseElectromyographyConcentricPhysical medicine and rehabilitationmedicineEccentricHumansmultichannel EMG; dynamic contractions; isometric contractionsdynamic contractionsta315Muscle SkeletalMathematicsisometric contractionsmedicine.diagnostic_testElectromyographyMotor controlAnatomyMotor unitmedicine.anatomical_structuremultichannel EMGPhysical EnduranceNeurology (clinical)Muscle ContractionJournal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology
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Spatial variability of muscle activity during human walking: The effects of different EMG normalization approaches

2015

Human leg muscles are often activated inhomogeneously, e.g. in standing. This may also occur in complex tasks like walking. Thus, bipolar surface electromyography (sEMG) may not accurately represent whole muscle activity. This study used 64-electrode high-density sEMG (HD-sEMG) to examine spatial variability of lateral gastrocnemius (LG) muscle activity during the stance phase of walking, maximal voluntary contractions (MVCs) and maximal M-waves, and determined the effects of different normalization approaches on spatial and inter-participant variability. Plantar flexion MVC, maximal electrically elicited M-waves and walking at self-selected speed were recorded in eight healthy males aged 2…

AdultMaleNormalization (statistics)EMG normalizationmedicine.medical_specialtyWalkingElectromyographyta3112Young AdultPhysical medicine and rehabilitationmedicineHumansHuman legMuscle activityMultichannel EMGMuscle Skeletalta315MathematicsLegmedicine.diagnostic_testElectromyographyGeneral NeuroscienceReproducibility of ResultsSignal Processing Computer-AssistedElectric StimulationElectromyogramData Interpretation StatisticalGait analysisPhysical therapySpatial variabilityGait analysisPeak valuehuman activitiesLateral gastrocnemiusNEUROSCIENCE
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