The Impact of Eccentric Exercises of Hip Adductor Muscles on Range of Motion and Performance of Lower Limbs among Male Taekwondo Players Suffering From Lower Limb Injuries

摘要

The purpose of the present study is to investigate the impacts of eccentric exercises of hip adductor muscles on Range of Motion and performance of lower limbs among male Taekwondo players suffering from lower limb injuries. The population of the study includes the entire male Taekwondo players of Tehran during 2015. Among the population, a number of 30 individuals were selected as the sample of the study through purposive sampling method. Furthermore, the sample was divided into two 15 individuals groups namely as control and experimental groups. Prior to initiation of evaluations, subjects had signed the privacy policy papers for taking part in the experiment and next, their personal information was collected. Each person was individually provided with general debriefings regarding the manner of performance of tests. Conditions for participation in study also included having at least a two year experience of playing Taekwondo for three times a week and being aged between 16 to 20 years. Prior to execution of intervention program (hip adductor muscles strengthening program) subjects had been subjected to tests measuring Range of Motion of abduction and external rotation of hip using a Goniometer as well as kinetic performance of lower limbs through vertical jump test, one-foot single jump distance, one-foot triple jumps distance, stairway leap running time, sweep running time and one foot squatting test. Intervention included performance of eccentric exercises using a strap for strengthening hip adductor muscles for 8 weeks. 48 hours after execution of intervention program, the subjects have taken lower limbs strength and performance tests as they had taken their pre-test. Descriptive statistics have been used for describing and organizing data obtained from posttest and pretest. In term of inferential statistics, the Co-variance analysis was applied. In case of significance of average differences in Covariance test, the LSD post hoc test would be applied. It is noteworthy to mention that the entire statistical operations were performed using the SPSS software v.23. Findings of the study have shown that eight weeks of eccentric exercises of hip adductor muscles will lead to improvement of Range of Motion of hip abduction and external rotation as well as improvement of movement performance of lower limbs among male Taekwondo players suffering from groin strain. As a result, performing eccentric exercises is recommended for people suffering from groin injuries.