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Muscle Activation Differs between Three Different Knee Joint-Angle Positions during a Maximal Isometric Back Squat Exercise
Joint Authors
Greve, Júlia Maria D’Andréa
Marchetti, Paulo Henrique
Jarbas da Silva, Josinaldo
Nardi, Priscyla Silva Monteiro
Pecoraro, Silvio Luis
Hartigan, Erin
Schoenfeld, Brad J.
Source
Issue
Vol. 2016, Issue 2016 (31 Dec. 2016), pp.1-6, 6 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2016-07-18
Country of Publication
Egypt
No. of Pages
6
Main Subjects
Abstract EN
The purpose of this study was to compare muscle activation of the lower limb muscles when performing a maximal isometric back squat exercise over three different positions.
Fifteen young, healthy, resistance-trained men performed an isometric back squat at three knee joint angles (20°, 90°, and 140°) in a randomized, counterbalanced fashion.
Surface electromyography was used to measure muscle activation of the vastus lateralis (VL), vastus medialis (VM), rectus femoris (RF), biceps femoris (BF), semitendinosus (ST), and gluteus maximus (GM).
In general, muscle activity was the highest at 90° for the three quadriceps muscles, yet differences in muscle activation between knee angles were muscle specific.
Activity of the GM was significantly greater at 20° and 90° compared to 140°.
The BF and ST displayed similar activation at all joint angles.
In conclusion, knee position alters muscles activation of the quadriceps and gluteus maximus muscles.
An isometric back squat at 90° generates the highest overall muscle activation, yet an isometric back squat at 140° generates the lowest overall muscle activation of the VL and GM only.
American Psychological Association (APA)
Marchetti, Paulo Henrique& Jarbas da Silva, Josinaldo& Schoenfeld, Brad J.& Nardi, Priscyla Silva Monteiro& Pecoraro, Silvio Luis& Greve, Júlia Maria D’Andréa…[et al.]. 2016. Muscle Activation Differs between Three Different Knee Joint-Angle Positions during a Maximal Isometric Back Squat Exercise. Journal of Sports Medicine،Vol. 2016, no. 2016, pp.1-6.
https://search.emarefa.net/detail/BIM-1110742
Modern Language Association (MLA)
Marchetti, Paulo Henrique…[et al.]. Muscle Activation Differs between Three Different Knee Joint-Angle Positions during a Maximal Isometric Back Squat Exercise. Journal of Sports Medicine No. 2016 (2016), pp.1-6.
https://search.emarefa.net/detail/BIM-1110742
American Medical Association (AMA)
Marchetti, Paulo Henrique& Jarbas da Silva, Josinaldo& Schoenfeld, Brad J.& Nardi, Priscyla Silva Monteiro& Pecoraro, Silvio Luis& Greve, Júlia Maria D’Andréa…[et al.]. Muscle Activation Differs between Three Different Knee Joint-Angle Positions during a Maximal Isometric Back Squat Exercise. Journal of Sports Medicine. 2016. Vol. 2016, no. 2016, pp.1-6.
https://search.emarefa.net/detail/BIM-1110742
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1110742