O nível de ativação dos músculos do tronco durante o agachamento com diferentes bases de estabilidade

Abstract

Physical exercise is used in programs of physical conditioning and rehabilitation, to gain muscle strength, and to improve physical exercise performance. The game can be made with the same changes, which can influence the movement pattern of the mind and the bottom tree. The present study aims to identify the level of activation of the trunk muscles during the squatting and sinking exercise with different stability bases. METHODOLOGY: Participated in the study 15 of the male, with an age of 20 ± 40 years. The participants performed a voluntary isometric contraction (flexion and extension of the trunk and extension of the knee) in order to normalize the data, as well as the physical exercise, with the monitoring of energy electromyography in the muscles, rectus abdominis, external oblique, erector of the trunk of the lumbar region, rectus femoris, vastus lateralis, all on the right side. The bases of the exercise were: A) Simple squatting based on the stable scenario and C) sinking with unstable base with the hind foot in a Swiss ball. The electromyographic cycles were rectified, filtered (with cutoff frequencies of 20 and 500 Hz) and the level of muscle activation was measured during IMC and in all exercises. The RMS of the CIVM served to normalize (in percent) the values observed in the three exercises. Data on the characteristics of the sample were submitted to a standard descriptive analysis (mean and standard deviation), a one-way ANOVA was used to compare the RMS percentages of the exercises for each muscle. The variables were tested with a significance level of p <0.05. The Bonferroni post-hoc test was used when differences were detected. Statistical software (Statsoft Inc., version 7.0) was used as analysis. RESULTS: The levels of activation (RMS normalized by the CIVM) of the Femoral Reto (RF) and Vasto Lateral (VL) muscles were similar (p> 0.05) during the squats: simple (RF = 58 ± 5.3%; VL = 59 ± 5.0%), inflow (FR = 61 ± 6.2%, VL = 61 ± 6.3%) inflow with unstable basis (FR = 63 ± 6.1%, VL = 63 ± 5.9 %). The level of activation of the rectus abdominis muscle was similar (p> 0.05) (simple = 2.8 ± 1.8%, baseline = 3.1 ± 2.2%, baseline with unstable base 2.9 ± 1 , 2%) in all exercises. On the other hand, the external oblique muscle presented the highest level of performance during squatting with an unstable base (16.1 ± 4.5%, p <0.05) when compared to other exercises (squatting = 10.9 ± 3.1% (56 ± 9.3%) and inflow with unstable base (55 ± 8.8%) (p> 0.05) ) and linguistic minor (p <0.05) when compared to stable-based squatting (44 ± 8.3%). It was evident that the muscular levels of the countries of the region are not greater with the increase of the instability, but also of the average of the inferior members.