Proposta de índice eletromiográfico para o treinamento de músculos lombares

Abstract

The endurance training of erector spinae muscles in the last year has been showed to be an important variable related to physical and functional integrity of spine. Objectives: The purpose of this study was to verify the efficacy of the electromyographic fatigue threshold (EMGFT) as index in a training protocol of the erector spinae muscles in lower back. Methods: 16 male and healthy volunteers have participated in of the study. They were separated in a training group (TG) and a control group (CG). The posture used was the prone position with the lower limbs fixed to table test. The movement required was the trunk extension in a neutral position. The training was performed with load equivalent to EMGFT during 4 weeks and with frequency of 3 sessions for week. This index was obtained from submaximal contractions equivalent to 5%, 10%, 15% and 20% of a maximal isometric voluntary contraction (MIVC). Results: There were no changes in MIVC and endurance time values. The electromyographic parameters, root mean square and median frequency, also showed no changes in both groups. Conclusions: In this way, the use of the EMGFT as index for the erector spinae muscles training reveled, in the present experimental conditions, to be ineffective for the use as load intensity necessary for satisfactory results.