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Abstract

This study aimed to identify the values of some biomechanical variables of the muscles operating at the pelvic, knee, and ankle joints in the dominant and non-dominant legs among Jordanian national team players practicing the back squat exercise using the Biodex device. Additionally, it sought to examine the differences in the values of the biomechanical variables between the dominant and non-dominant legs. To achieve this, the researchers employed a descriptive approach, selecting a sample of 15 males chosen through purposive sampling, ensuring their training included squat exercises for a period of no less than two years. The researchers used the Biodex System III (Lafayette) to obtain the values of the biomechanical parameters of the study sample. The study analyzed various biomechanical variables, including maximum torque, maximum occupancy, and power rating. To process the study data, the researchers calculated means, standard deviations, skewness, and conducted a T-test for independent samples. The results showed differences in the values of the biomechanical variables between the dominant and non-dominant legs, with statistically significant differences observed in relative strength during the extension movement at the pelvic joint and in muscle balance during the adduction movement at the pelvic joint, both favoring the non-dominant leg. Additionally, no statistically significant differences were found between the dominant and non-dominant legs regarding the biomechanical variables at the knee and ankle joints. The researchers recommend that the Biodex device be used to measure force balance periodically due to its reliability and stability in measuring muscle strength and force balance.

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