Abstract

OLIVEIRA, Anderson; GONCALVES, Mauro; CARDOZO, Adalgiso  and  BARBOSA, Fernando. Biceps curl exercise: endurance time and load level effects in the electromyographic activity of lumbar muscles. Rev. Port. Cien. Desp. [online]. 2006, vol.6, n.2, pp.170-178. ISSN 1645-0523.

The purpose of this study was to verify the effect of execution time, load level and contraction type in the electromyographic activity of longissimus thoracis muscle bilaterally, during the execution of the biceps curl exercise. Ten healthy subjects performed the exercise until exhaustion with 25%, 35% and 45% of one repetition maximum (RM), in three different days. Root mean square and slope were analyzed in each 10% of total time. Results showed a progressive increase in electromyographic activity with time, at 25% and 35% of 1RM with significant increases in the electromyographic activity beginning at 80% of execution time. The effect of load level in the activity of longissimus thoracis muscles occurred in the concentric phase between 25% and 45% of RM. There was a predominantly effect of contraction type at 45% of 1-RM for both muscles, and was found a small effect of contraction type for slope values. These results allow to conclude that the performance of biceps curl exercise increases the electromyographic activity of longissimus thoracis muscles during the concentric elbow movements and at 80% of execution time.

Keywords : muscle fatigue; electromyography; erector spinae; trunk stabilization; resisted training.

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