RELATIONSHIP BETWEEN WORKLOAD AND NEUROMUSCULAR ACTIVITY IN THE BENCH PRESS EXERCISE
Journal Title: Medicina Sportiva - Year 2013, Vol 17, Issue 1
Abstract
Objective: To investigate the relationship between strength and electromyographic (EMG) signal in different intensities in the bench press exercise. Methods: Eleven healthy resistance trained men (22.8 ± 3.5) participated into the present study. Maximal isometric strength was determined in the bench press exercise using a load cell. Muscle activation was assessed using surface elec¬tromyography (EMG) signals from the muscles pectoralis major, anterior deltoid and posterior deltoid at intensities ranging to 60-90% of maximal voluntary contraction (MVC), in the bench press exercise. This procedure allowed the analysis of the strength/EMG relationship. Results: In all muscles assessed, there were significant differences in the normalized muscle activation between the intensities of 60 and 70% of the MVC, as well as between 70 and 80% (P < 0.05), while there were no differences between 80 and 90% of MVC. In addition, there were significant correlations between strength and EMG signals for the muscles pectoralis major (r = 0.43, P = 0.04), anterior deltoid (r = 0.52, P = 0.01), and posterior deltoid (r = 0.32, P = 0.046). Conclusions: These results suggest that levels of muscle activation near to maximal are obtained at the intensity of 80 of MVC and no additional motor unit recruitment are achieved at 90% of MVC.
Authors and Affiliations
Ronei Pinto, Eduardo Cadore, Cleiton Correa, Bruna Gonçalves Cor¬deiro da Silva, Cristine Alberton, Cláudia Lima, Antonio de Moraes
Keywords
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- EP ID EP74200
- DOI 10.5604/17342260.1041876
- Views 75
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