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Isometric Training with Maximal Co-Contraction Instruction Does Not Increase Co-Activation during Exercises against External Resistances

Abstract : The present investigation verified that strength is improved by a training programme consisting of repetitions of maximal isometric voluntary co-contractions without increasing co-activations during contractions against external resistances. Ten participants performed 12 training sessions (four sets of 6 × 4 second maximal isometric co-contraction of the elbow flexor and extensors, 3 days a week for 4 weeks). Surface electromyograms of triceps and biceps brachii were collected during maximal voluntary isometric elbow flexion and extension against a force transducer. Maximal voluntary isometric force increased significantly after training, by 13.8 ± 6.0% (extension) and 9.6 ± 9.5% (flexion), but the observed increases in EMG of agonist muscles during maximal voluntary contraction were not significant. No significant changes in the levels of co-activation of the elbow flexors and extensors were observed. No significant change was observed for all the parameters in a control group of ten participants. These results indicated that the strength improvements after co-contraction training occur without increases in co-activation level.
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Submitted on : Tuesday, February 14, 2017 - 4:18:44 PM
Last modification on : Saturday, June 20, 2020 - 4:10:07 PM

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Driss Tarak, Virgile Serrau, David George Behm, Ethelle Lesne-Chabran, Armande Le Pellec-Muller, et al.. Isometric Training with Maximal Co-Contraction Instruction Does Not Increase Co-Activation during Exercises against External Resistances. Journal of Sports Sciences, Taylor & Francis: SSH Journals, 2014, 32 (1), pp.60-69. ⟨10.1080/02640414.2013.805238⟩. ⟨hal-01467713⟩

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