Effects of six weeks of resistance exercise with reciprocal contractions on knee extensors neuromuscular performance: Randomized controlled trial

Euler Cardoso, Martim Bottaro, Pâmella Rodrigues, Igor Eduardo Souza, João Durigan, Ricardo Moreno Lima, Silvio Assis Oliveira Júnior, Rodrigo Luiz Carregaro*

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

BACKGROUND: Studies have shown that reciprocal exercise using a pre-Activation of antagonist muscles may increase the agonist neuromuscular performance. OBJECTIVE: To compare the efficiency of two modalities of resistance training (with and without antagonist muscle pre-Activation) during a six week program on knee extension neuromuscular performance of healthy men. METHODS: Forty-nine men were randomly assigned into two groups: 1) reciprocal training: REC - one concentric knee flexion immediately followed by one concentric knee extension, and 2) control: CON - one concentric knee extension exercise, without pre-Activation. Both training modes were characterized by three sets of 10 repetitions at 60°/s, 2 days/week. Knee extensor peak moment (PM), load range (LR), electromyographic activity (EMG) of the vastus medialis (VM), rectus femoris (RF), and biceps femoris (BF) co-Activation were assessed pre and post 6 weeks of training. A 2 × 2 mixed factor ANOVA was applied to evaluate differences between variables. RESULTS: Significant increases were found for PM between pre and post-evaluations for both groups. In relation to VM and RF activation, co-Activation (BF/VM and BF/RF) and LR, no significant differences between groups and moments were found. CONCLUSION: In view of the results further research is indicated in order to examine the utility of longer programs in positively affecting antagonist muscle co-Activation as well as in elucidating its clinical effects in individuals with musculoskeletal dysfunction.

Original languageEnglish
Pages (from-to)109-116
Number of pages8
JournalIsokinetics and Exercise Science
Volume23
Issue number2
DOIs
Publication statusPublished - 2 Jun 2015

Keywords

  • isokinetic
  • knee
  • muscle strength
  • Resistance exercise

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