Individual Control Strategies in Training: Myoelectric activity and recruitment strategies in the co-contraction training
Keywords:Co-activation, Self-resistance exercise, EMG, Force Control, Practice Effect
BACKGROUND: The literature in motor control has abundant evidence on within-/between-person variability when it comes to control strategies in several behaviors - which largely influences intervention outcomes. Despite being an intervention itself, strength training paradigms are yet to be analyzed beyond the average behavior. Based on myoelectric activity (EMG) analyses, this study emerges as a descriptive analysis on how the co-contraction training paradigm provides stimuli for strength training of knee extensors and flexors.
AIM: Considering the potential large interindividual variability in muscle activation patterns during resistance training, we explored the co-contraction paradigm considering the individual characteristics.
METHOD: Ten active male adults participated in two days of co-contraction training paradigm with their EMG activity collected (sartorius, biceps femoris long and short heads, semitendinosus, semimembranosus, rectus femoris, vastus lateralis and medialis and tensor fascia-latae).
RESULTS: On average, participants recruit 36% of their maximum EMG amplitude, decay 0.41% per repetition but increase 7.45% between sessions. The training stimulated similarly the knee flexors and extensors EMG ratio of all participants. However, participants demonstrated different average muscle recruitment patterns with few individuals modifying, largely, their recruitment over repetitions/days. Between and within-variability in recruitment pattern was maintained throughout repetitions and days.
CONCLUSION: Thus, the co-contraction training demonstrated sufficient muscle activation to be employed and evoked similar muscular recruitment between agonists and antagonists. To the best of our knowledge, this is a pioneer study encompassing the complexity of movement control in evaluating a strength training protocol.
How to Cite
Copyright (c) 2023 Nilson R. S. Silva, Matheus Maia Pacheco, Rafael A. Fujita, Marina M. Villalba, Matheus M. Gomes
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Authors must declare that the work submitted is their own and that copyright has not been breached in seeking its publication. If the manuscript includes work previously published elsewhere, it is the author(s) responsibility to obtain permission to use it and to indicate that such permission has been granted.
Authors retain the copyright of their paper and grant the Brazilian Journal of Motor Behavior (BJMB) the right to first publish the work under a Creative Commons Attribution-NonCommercial-NoDerivatives license (CC BY-NC-ND). This license allows users to share the paper given the appropriate credit to the author and source and does not allow commercial uses and derivative materials to be produced.