An exploration of the motor unit behaviour during the concentric and eccentric phases of a squat task performed at different speeds.
Despite squatting being important in strength training and rehabilitation, few studies have investigated motor unit (MU) behaviour. This study explored the MU behaviour of vastus medialis (VM) and vastus lateralis (VL) during the concentric and eccentric phases of a squat exercise performed at two s...
| Publicado en: | Sports Biomechanics Vol. 24; no. 10; pp. 3081 - 3093 |
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| Autores principales: | , , , , |
| Formato: | research tables/charts Journal Article |
| Publicado: |
Taylor & Francis Ltd
Oct2025
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=190283191&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 190283191 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 14763141 I7F jtl: Sports Biomechanics issn: 14763141 maglogo: N pubinfo: dt: Oct2025 vid: 24 iid: 10 pid: 377 pub: Taylor & Francis Ltd place: Philadelphia, Pennsylvania artinfo: ui: 190283191 164418864 190283191 190283191 10.1080/14763141.2023.2221682 190283191 ppf: 3081 ppct: 12 formats: tig: atl: An exploration of the motor unit behaviour during the concentric and eccentric phases of a squat task performed at different speeds. aug: au: Orantes-Gonzalez, Eva Heredia-Jimenez, Jose Lindley, Steven B Richards, Jim D Chapman, Graham J affil: Department of Sports and Computer Science, Faculty of Sports, University of Pablo de Olavide, Seville, Spain sug: subj: Task Performance and Analysis Squatting Physiology Motor Neurons Physiology Concentric Contraction Eccentric Contraction Muscle Contraction Physiology Quadriceps Muscles Physiology Biomechanics Resistance Training Electromyography Human Male Female Adult Students, College Faculty Colleges and Universities Athletic Performance Evaluation Muscle, Skeletal Physiology Action Potentials Descriptive Statistics Comparative Studies Analysis of Variance Paired T-Tests Post Hoc Analysis Data Analysis Software Lower Extremity Practice Guidelines Movement Neuromuscular Control Adult: 19-44 years Male Female ab: Despite squatting being important in strength training and rehabilitation, few studies have investigated motor unit (MU) behaviour. This study explored the MU behaviour of vastus medialis (VM) and vastus lateralis (VL) during the concentric and eccentric phases of a squat exercise performed at two speeds. Twenty-two participants had surface dEMG sensors attached over VM and VL, and IMUs recorded thigh and shank angular velocities. Participants performed squats at 15 and 25 repetitions per minute in a randomised order, and EMG signals were decomposed into their MU action potential trains. A four factor (muscle × speed × contraction phase × sexes) mixed methods ANOVA revealed significant main effects for MU firing rates between speeds, between muscles and between sexes, but not contraction phases. Post hoc analysis showed significantly greater MU firing rates and amplitudes in VM. A significant interaction was seen between speed and the contraction phases. Further analysis revealed significantly greater firing rates during the concentric compared to the eccentric phases, and between speeds during the eccentric phase only. VM and VL respond differently during squatting depending on speed and contraction phase. These new insights in VM and VL MU behvaviour may be useful when designing training and rehabilitation protocols. pubtype: Academic Journal doctype: research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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