Biomechanical Analysis of the Muscles Balance on the Dominant and non- Dominant Leg among some of the Jordanian National Team Players Practicing the Back Squat Exercise

Abstract

This study aimed to identify the values of some biomechanical variables of the muscles operating on the pelvic, the knee and the ankle joints in the dominate and non- dominate leg among the Jordanian national team players practicing the back squat exercise by using the Biodex device, as well as to the differences in the values of the biomechanical variables between the dominate and non- dominate leg. To achieve this, the researchers used the descriptive approach on a sample of (15) male and they were chosen by the purposive method, so that their training includes squat training for a period of not less than two years. To obtain the values of the biomechanical parameters of the study sample, the researchers used a Biodex device. Biodex System III (Lafayette). In addition, the study dealt with many biomechanical variables such as maximum torque, maximum occupancy and power rating. To process the study data, the researchers used means, standard deviations, skewness and T-test for independent samples. The results of the study showed a difference in the values of the biomechanical variables under study between in the dominant and non- dominant leg, as well as the presence of statistically significant differences between in the dominate and non- dominate leg in the relative strength variable in the extension movement on the pelvic joint, and the muscle balance variable in the adduction movement on the pelvic joint in favor of the non- dominate leg. Additionally, there were no statistically significant differences between the dominant and non- dominate leg in the biomechanical variables on the knee and ankle joints. The researchers recommend that the Biodex device should be used to measure the balance of forces periodically, because of its reliability and stability in measuring muscle strength and the balance of forces.

Keywords: Biomechanical, Muscles Balance, Dominant leg, non-dominant leg, Back squat.