ABSTRACT
Purpose: This study was accomplished to investigate the electromyographic activity of 3 plyometric exercises [tuck jump and single leg hop in sagittal and frontal planes] to find out the appropriate procedures for strengthening biceps femoris and gluteus medius muscles
Methods: The kind of study is applied and data were collected from the supervised exercises of 15 male athletes without injury of lower extremity from Tehran University, which participated voluntarily in this research. It was assumed that subjects expend the extreme potential during their activities. Statistical analysis was made using repeated measures ANOVA to investigate the muscle activity in feedforward and feedback phases of landing with SPSS 20
Results: Significant differences [P
Conclusion: According to the results, single leg hop in sagittal and frontal planes could be the most appropriate exercises for improving strength and neuromuscular system of gluteus medius and biceps femoris. We should take special attention to these 2 plyometric exercises in exercise programs. However, tuck jump in comparison with 2 other exercises show less effectiveness
ABSTRACT
Strength of knee extension and squat were compared between anterior cruciate ligament reconstructed [ACLR] patients and healthy subjects. Twenty ACLR and twenty control subjects were participated in this non-exprimental study. Isokinetic peak strength of knee extension and squat in involved and uninvolved side of the ACLR patient and control group were measured. Concentric and eccentric knee extension strength of the involved leg was decreased but squat strength showed no difference. In spite of return to sport activity and normal squat strength weakness of knee extensor muscles in the involved side of the ACLR patient was existed
ABSTRACT
A lesion of the anterior cruciate ligament [ACL] is a major trauma of the knee. Neuromuscular control is believed to be a critical factor in dynamic knee stability in ACL deficient [ACLD] patients. Neuromuscular training programs [in particular perturbation training] are increasingly integrated into clinical practice for ACL lesion rehabilitation. The purpose of this study was to investigate the effect of the modified perturbation training on neuromuscular control system and functional improvement in ACLD. 10 professional male athletes with an average of 6.7 +/- 3.19 months after their unilateral ACL rupture participated in this study. Surface Electromyographic [EMG] data were recorded during a cross hop task, from the rectus femoris, vastus medialis, medial head of the gastrocnemius, biceps femoris and gluteus maximus muscles. Muscle activation patterns before and after 10 sessions of perturbation training were compared. Treatment outcome was determined from scores of questionnaires and functional tests. Scores of IKDC subjective questionnaire and functional tests were significantly improved [P<0.05]. Muscle activation patterns were modified. The significant earlier onset and late peak of the rectus femoris resulted in the longer duration from onset-to-peak activity in both of the involved and non involved limbs [P<0.05]. Perturbation training has a central effect that modifies neuromuscular control system through the change in feed-forward control for ACL deficient patients. Rectus femoris activation is not harmful to ACL and causes a protective effect. Optimum activity of this muscle is important for ACL injury prevention and rehabilitation