Comparison of electromyographic activity of selected knee and hip muscles in squat at different angles of hip between individuals with and without genu varum
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Department of Corrective Exercises and Sport Injury Faculty of Physical education, Allameh Tabataba’i University
Abstract
Introduction: The aim of this study was to compare electromyographic activity of selected knee and hip muscles in squat at different angles of hip between individuals with and without genu varum.
Methodology: A sample of 32 students from Allameh Tabatabaee University was formed. Sixteen of them had genu varum and 16 had normal knee that were selected according to the criteria for entering the research. Recording of electromyography activity with surface electrodes of the muscles of vastus medialis , vastus lateralis, gluteus medius, tensor faciae latae and biceps femoris at 15,30,45 External and internal rotation and the neutral of the hip was performed during squat. Also, from a plate designed to adjust the angles of rotation of hip was used. Everyone performed the move 3 times with 30 second rest intervals between them, in which case the effect of the fatigue was eliminated, between a situation and giving the next position in the range of the change of rotation of the hip, a 4 minute rest interval was given to the sample and for performing electromyographic activity recording at the next dimension on the screen. In order to normalize the data, MVIC tests were used.
Results: The analysis of the data obtained from the research to compare the activity of each muscle at different angles in each group using Friedman statistical method showed that the activity of vastus medialis, vastus lateralis, and tensor faciae latae muscles in squat with change in hip position was not significant in the normal group (p>0.05), but the activity of the gluteus medius and biceps femoris was significant (p<0.05). Also, in the genu varum group, the activity of all five muscles in the squat was significant (P<0.05). The analysis of the muscle activity between the two groups using the Mann-Whitney statistical method showed that the genu varum deformity induced changes in the electromyographic activity of the vastus medialis, vastus lateralis, gluteus medius, and tensor faciae latae muscles in the squat with different angles of the hip joint (P < 0.05), but there was not difference in the level of biceps femoris muscle activity between the two groups (p > 0.05).
Discussion: As a result, in order to design a training protocol for people with deformity of the genu varum with corrective and rehabilitation goals in squat, attention should be paid to these changes in the activity of electromyography of the muscles.
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