Neuromuscular responses of the superficial quadriceps femoris muscles: Muscle specific fatigue and inter-individual variability during severe intensity treadmill running
Autor
Bergstrom H.C.
Housh T.J.
Dinyer T.K.
Byrd M.T.
Jenkins N.D.M.
Cochrane-Snyman K.C.
Succi P.J.
Schmidt R.J.
Johnson G.O.
Zuniga J.M.
Resumen
Objectives: 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.
Colecciones
Ítems relacionados
Mostrando ítems relacionados por Título, autor o materia.
-
Article
The effect of epoch length on time and frequency domain parameters of electromyographic and mechanomyographic signals (2020)
Keller J.L.; Housh T.J.; Camic C.L.; Bergstrom H.C.; Smith D.B.; Smith C.M.; Hill E.C.; Schmidt R.J.; Johnson G.O.; Zuniga J.M. (Elsevier Ltd, 2018) -
Article
Acute metabolic, physiological and neuromuscular responses to two high-intensity intermittent training protocols in endurance runners (2020)
Garciá-Pinillos F.; Párraga-Montilla J.A.; Soto-Hermoso V.M.; Salas-Sánchez J.; Latorre-Román P.Á. (IOS Press, 2016) -
Article
Effectiveness of thoracolumbar myofascial release on increasing sternocleidomastoid resistance and reducing forward head posture angle [Efectividad de la técnica de liberación de la fascia toracolumbar sobre la resistencia muscular del esternocleidomastoideo bilateral y el ángulo de anteposición de cabeza y cuello] (2020)
Astorga Verdugo S.; Gonzalez Silva S.; Rojas Cabezas G.; Martinez Araya A. (Ediciones Doyma, S.L., 2019)