نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه بیومکانیک و آسیب شناسی ورزشی، دانشکده علوم ورزشی، دانشگاه خوارزمی تهران، تهران، ایران.
2 گروه فیزیولوژی و حرکات اصلاحی، دانشکده علوم ورزشی، دانشگاه ارومیه، ارومیه، ایران.
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Background and Aims According to studies, motor learning instructions and strategies have been effective in anterior cruciate ligament (ACL) injury prevention programs. Therefore, the current study aimed to study the effect of motor learning strategies on landing biomechanics in athletes with dynamic knee valgus.
Methods This study was a quasi-experimental and applied research. 48 male athletes aged 20-25, participating in handball, volleyball, and basketball, with a dynamic knee valgus angle greater than 10 degrees, were randomly assigned to four groups(n=12): Differential learning, self-controlled feedback, external focus of attention, and control. The training program lasted eight weeks, with three sessions per week for the first six weeks and two sessions per week for the last two weeks. Each session was 45 minutes long. Using motion analysis and EMG systems, kinematics and kinetics parameters during landing were measured. To analyze the data, 4×2 repeated measures ANOVA was directed, followed by post hoc comparison (Bonferroni) at the significant level of P≤0.05.
Results The present study showed an increase in peak hip and knee flexion angles, a decrease in peak knee abduction angle, and an increase in gluteus medius feedforward activity from the pre-test to post-test in differential learning and external focus of attention groups. Also, the differential learning group observed an increase from the pre-test to post-test values of peak dorsiflexion angle and gluteus maximus feedforward activity. In between-groups comparison, there was a significant difference between the differential, control, and self-control feedback groups in peak knee flexion and abduction angles. Also, the differential learning group showed a significant difference in gluteus medius feedforward activity compared to the control group.
Conclusion Differential learning and external focus of attention methods positively reduced the kinetic and kinematic risk factors of ACL injury. However, the results of the present study consider the differential learning method and the role of variability in training to be effective in preventing ACL injury and suggest the differential learning method for the greater benefit of athletes.
کلیدواژهها [English]