Interplay between body stabilisation and quadriceps muscle activation capacity

Bampouras, Theodoros, Reeves, Neil, Baltzopoulos, Vasilios and Maganaris, Constantinos N. (2017) Interplay between body stabilisation and quadriceps muscle activation capacity. Journal of Electromyography and Kinesiology, 34 . pp. 44-49. Item availability may be restricted.

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The study aimed to distinguish the effect of stabilisation and muscle activation on quadriceps maximal isometric voluntary contraction (MVC) torque generation. Nine subjects performed a) an MVC with restrained leg and pelvis (Typical MVC), b) a Typical MVC with handgrip (Handgrip MVC), c) an MVC focusing on contracting the knee extensors only (Isolated knee extension MVC), and d) an MVC with unrestrained leg and pelvis (Unrestrained MVC). Torque and activation capacity between conditions were compared with repeated measures ANOVA and dependent t-tests. EMG (from eleven remote muscles) was compared using Friedman’s and Wilcoxon. Typical MVC (277.2±49.6 Nm) and Handgrip MVC (261.0±55.4 Nm) were higher than Isolated knee extension MVC (210.2±48.3 Nm, p<0.05) and Unrestrained MVC (195.2±49.7 Nm, p<0.05) torque. Typical MVC (83.1±15.9%) activation was higher than Isolated knee extension MVC (68.9±24.3%, p<0.05), and both Typical MVC and Handgrip MVC (81.8±17.4%) were higher than Unrestrained MVC (64.9±16.2%, p<0.05). Only flexor carpi radialis, biceps brachii, triceps brachii and external oblique muscles showed EMG differences, with Isolated knee extension MVC consistently lower than Typical MVC or Handgrip MVC. Stabilisation of the involved segments is the prime concern allowing fuller activation of the muscle, reinforcing the need for close attention to stabilisation during dynamometry-based knee joint functional assessment.

Item Type: Article
Journal or Publication Title: Journal of Electromyography and Kinesiology
Publisher: Elsevier
ISSN: 1873-5711
Departments: Faculty of Health and Science > Medical and Sports Sciences > Sports and Physical Activity > Sport
Depositing User: Theodoros Bampouras
Date Deposited: 29 Mar 2017 09:54
Last Modified: 30 Nov 2017 16:25

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