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
Related Articles
- EP ID EP74200
- DOI 10.5604/17342260.1041876
- Views 110
- Downloads 0
D-ASPARTIC ACID: BIOLOGICAL ROLE AND POTENTIAL APPLICATIONS AS DIETARY SUPPLEMENT IN SPORT
Aspartic acid naturally occurs as an L- or D-form. Like many other chemical, aspartic acid demonstrates a varied biological activity dependent on which enantiomer it is in a pair. L-Aspartic acid (L-Asp) belongs to endog...
THE EVALUATION OF EATING BEHAVIOUR AND NUTRITIONAL STATUS OF BALLET DANCERS WITH MENSTRUAL DISORDERS
Introduction: It is known that ballet dancers are particularly at risk from eating disorders and consequents like menstrual disorders. Objective: The aim of this study was to evaluate eating behavior and nutritional stat...
EFFECTS OF REHABILITATION IN THE FORM OF DANCE AND MOVEMENT THERAPY ON NITRIC OXIDE LEVELS IN ELDERLY WOMAN
Introduction: Nitric oxide (NO) is a multifunctional molecule, acting as a neurotransmitter and mediating the inflammatory response and regulation of vascular tone. Insufficient NO production is one of the earliest sympt...
THE ENDURANCE TRAINING EFECTS OF HIGH – ALTITUDE ALPINISTIC EXPEDITION MAY BE LESS STRONG STIMULUS FOR PERFORMANCE IN HYPOXIA, THAN ACCLIMATIZATION
Objective: To ascertain whether the exercise stimulus during high–altitude alpinistic expedition is enough strong to influ¬ence alpinists performance similarly as acclimatization. Methods: Two groups: 4 alpinists (age:...
A COMPARISON OF METHODS TO DETERMINE VENTILATORY EFFICIENCY IN ATHLETES
Introduction: Human ventilatory efficiency is quantified during exercise using the slope of the linear relationship between minute ventilation (¦E) and carbon dioxide output (¦CO2), and the oxygen uptake efficiency slope...