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Neuromuscular responses of the superficial quadriceps femoris muscles: Muscle specific fatigue and inter-individual variability during severe intensity treadmill running

dc.contributor.authorBergstrom H.C.
dc.contributor.authorHoush T.J.
dc.contributor.authorDinyer T.K.
dc.contributor.authorByrd M.T.
dc.contributor.authorJenkins N.D.M.
dc.contributor.authorCochrane-Snyman K.C.
dc.contributor.authorSucci P.J.
dc.contributor.authorSchmidt R.J.
dc.contributor.authorJohnson G.O.
dc.contributor.authorZuniga J.M.
dc.date.accessioned2020-09-02T22:13:06Z
dc.date.available2020-09-02T22:13:06Z
dc.date.issued2020
dc.identifier.citation20, 1, 77-87
dc.identifier.issn11087161
dc.identifier.urihttps://hdl.handle.net/20.500.12728/3732
dc.descriptionObjectives: This study examined the time course of changes and patterns of responses in electromyographic amplitude (EMG AMP) and EMG mean power frequency (MPF) for the superficial quadriceps muscles during exhaustive treadmill runs within the severe exercise intensity zones (SIZ1 and SIZ2). Methods: The EMG signals for the vastus lateralis (VL), rectus femoris (RF), and vastus medialis (VM) as well as times to exhaustion (Tlim) were recorded in ten runners during two exhaustive treadmill runs (SIZ1 and SIZ2). The composite and individual responses were compared among muscles and between intensities. Results: The composite patterns of responses in EMG AMP (linear, quadratic, and cubic increases; r2 /R2 =0.684–0.848) and EMG MPF (linear, quadratic, and cubic decreases; r2 /R2 =0.648 – 0.852) for the VL and RF were consistent with neuromuscular fatigue in both zones, but those for the VM were not (quadratic, cubic, and non-significant relationships with responses near baseline). The RF tended to demonstrate greater fatigue (EMG MPF decreased from 80–100% Tlim). There was large inter-individual variability (only 10–60% of responses consistent with composite) in response to fatiguing treadmill running. Conclusions: The current findings support the examination and characterization of neuromuscular fatigue on an intensity, muscle, and subject-by-subject basis. © 2020, International Society of Musculoskeletal and Neuronal Interactions. All rights reserved.
dc.language.isoen
dc.publisherInternational Society of Musculoskeletal and Neuronal Interactions
dc.subjectCritical Velocity
dc.subjectIndividual Responses
dc.subjectNeuromuscular Fatigue
dc.subjectSuperficial Quadriceps
dc.subjectTreadmill Running
dc.subjectadult
dc.subjectArticle
dc.subjectcontrolled study
dc.subjectdemography
dc.subjectelectromyography
dc.subjectfemale
dc.subjectfollow up
dc.subjecthuman
dc.subjecthuman experiment
dc.subjectmale
dc.subjectmuscle fatigue
dc.subjectneuromuscular function
dc.subjectphysical activity
dc.subjectquadriceps femoris muscle
dc.subjectquestionnaire
dc.subjectrectus femoris muscle
dc.subjectsignal processing
dc.subjectsuperficial quadriceps femoris muscle
dc.subjecttreadmill exercise
dc.subjectvastus lateralis muscle
dc.subjectvastus medialis muscle
dc.subjectvelocity
dc.titleNeuromuscular responses of the superficial quadriceps femoris muscles: Muscle specific fatigue and inter-individual variability during severe intensity treadmill running
dc.typeArticle


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