Motor unit discharge rate and the estimated synaptic input to the vasti muscles is higher in open compared with closed kinetic chain exercise

Journal of Applied Physiology
Gennaro BocciaDeborah Falla

Abstract

Conflicting results have been reported on whether closed kinetic chain exercises (such as a leg press) may induce more balanced activation of vastus medialis (VM) and lateralis (VL) muscles compared with open kinetic chain exercise (such as pure knee extension). This study aimed to 1) compare between-vasti motor unit activity and 2) analyze the combined motor unit behavior from both muscles between open and closed kinetic chain exercises. Thirteen participants (four women, mean ± SD age: 27 ± 5 yr) performed isometric knee extension and leg press at 10, 30, 50, 70% of the maximum voluntary torque. High density surface EMG signals were recorded from the VM and VL and motor unit firings were automatically identified by convolutive blind source separation. We estimated the total synaptic input received by the two muscles by analyzing the difference in discharge rate from recruitment to target torque for motor units matched by recruitment threshold. When controlling for recruitment threshold and discharge rate at recruitment, the motor unit discharge rates were higher for knee extension compared with the leg press exercise at 50% [estimate = 1.2 pulses per second (pps), standard error (SE) = 0.3 pps, P = 0.0138] and 70% (estimate =...Continue Reading

References

Jan 1, 1989·Experimental Brain Research·T S MilesT H Le
Jan 1, 1973·Journal of the Neurological Sciences·M A JohnsonD Appleton
Aug 2, 2000·The American Journal of Sports Medicine·E WitvrouwG Vanderstraeten
Dec 4, 2003·Medicine and Science in Sports and Exercise·Ann-Katrin StensdotterCharlotte Häger-Ross
Dec 15, 2004·Medicine and Science in Sports and Exercise·Mohsen MakhsousLi-Qun Zhang
Jun 7, 2007·Journal of Motor Behavior·Ann-Katrin StensdotterCharlotte Häger-Ross
Oct 3, 2008·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·L MesinA Rainoldi
Feb 13, 2009·Physiotherapy Theory and Practice·Toby O SmithSimon T Donell
Aug 13, 2010·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Adrian Burden
Sep 25, 2012·European Journal of Applied Physiology·Alessio GallinaMarco Gazzoni
Nov 14, 2013·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Wolf PetersenChristian Liebau
Sep 24, 2014·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Matthew S TenanLisa Griffin
Oct 4, 2014·Journal of Applied Physiology·Dario FarinaRoger M Enoka
Sep 5, 2015·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Christopher M LaineDario Farina
Jan 19, 2016·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·E Martinez-ValdesD Farina
Feb 19, 2016·Physiology·Dario FarinaRoger M Enoka
Mar 1, 2016·Journal of Neural Engineering·Francesco NegroDario Farina
Apr 2, 2016·European Journal of Applied Physiology·Ryoichi EmaYasuo Kawakami
Jan 26, 2017·Medicine and Science in Sports and Exercise·Eduardo Martinez-ValdesDario Farina
Feb 9, 2018·Journal of Applied Physiology·Eduardo Martinez-ValdesDario Farina
Jul 6, 2018·Medicine and Science in Sports and Exercise·Eduardo Martinez-ValdesDeborah Falla

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Citations

Dec 5, 2019·Journal of Neural Engineering·Altamash HassanLaura Miller McPherson
Mar 19, 2020·The Journal of Physiology·Eduardo Martinez-ValdesDeborah Falla
Jun 10, 2020·Scandinavian Journal of Medicine & Science in Sports·Stefano NuccioPaola Sbriccoli
Sep 3, 2020·Journal of Neurophysiology·Eduardo Martinez-ValdesDario Farina
May 1, 2021·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Nosratollah HedayatpourDeborah Falla
May 7, 2021·Journal of Applied Physiology·Anderson Souza Oliveira, Francesco Negro
Jun 10, 2021·Journal of Neurophysiology·Tea Lulic-KurylloClark R Dickerson
Jul 21, 2021·International Journal of Sports Medicine·Georgios TrypidakisFrancesco Negro
Sep 3, 2021·Journal of Applied Physiology·Eduardo Martinez-ValdesDeborah Falla
Sep 11, 2021·The Journal of Physiology·Altamash S HassanGregory E P Pearcey

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Software Mentioned

R Development Core Team
car package
lsmeans package
lme4
Matlab
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