نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار بیومکانیک ورزشی، دانشگاه خوارزمی تهران
2 استاد بیومکانیک ورزشی، دانشگاه خوارزمی تهران
3 استادیار مهندسی مکانیک، دانشگاه خوارزمی تهران
چکیده
بررسی پایداری دینامیک مهارت ورزشی به شناسایی پیچیدگی رفتار سیستم حرکتی به‌منظور کاهش آسیب و بهبود عملکرد کمک می‌کند. دراین‌راستا، هدف از پژوهش حاضر بررسی تأثیر تمرین بر پایداری دینامیک موضعی مفاصل ران و زانو در پرش عمودی بود. بدین‌منظور 20 مرد جوان فعال در دو گروه کنترل(10 نفر) و تمرین (10 نفر) در این پژوهش شرکت کردند و داده‌های کینماتیکی ران، زانو و نیروی عکس‌العمل زمین در پیش‌آزمون و پس‌آزمون در اجرای پرش عمودی ثبت گردید. همچنین، گروه تجربی به‌مدت چهار هفته (12 جلسۀ 40 دقیقه‌ای) در برنامۀ تمرینی شرکت نمود و پایداری دینامیک موضعی زوایای ران و زانو با استفاده از روش غیرخطی بالاترین نمای لیاپانوف محاسبه گشت. نتایج نشان می‌دهد که به‌دنبال افزایش میزان پرش عمودی، برنامۀ تمرینی باعث بهبود معنادار پایداری دینامیک موضعی مفصل زانو شده است.به‌نظر می‌رسد که افزایش پرش عمودی به‌دنبال تمرین منجر به پایداری بیشتر مفصل زانو در‌مقایسه با مفصل ران می‌شود.
کلیدواژه‌ها
عنوان مقاله [English]
Effects of Selected Four Weeks Training on Hip and Knee Kinematics Local Dynamic Stability during Vertical Jump in Active Young Men
نویسندگان [English]
- Mehdi Khaleghi Tazji 1
- Heidar Sadeghi 2
- Seyed Ali Asghar Hoseini 3
- Raghad Memar 1
1 Assistant Professor of Sports Biomechanics. Kharazmi University
2 Professor of Sports Biomechanics, Kharazmi University
3 Assistant Professor of Mechanical Engineering, Kharazmi University
چکیده [English]
Quantifying dynamic stability of athletic skills help to identification of motor behavior complexity to reduce injury and improve performance. The purpose of this study was to evaluate the effects of training on local dynamic stability in vertical jump maneuver. Twenty young male subjects (control (n=10), exercise (n=10)) participated in this study. Hip and knee kinematics and ground reaction forces data during vertical jump were recorded at pre-test and post-test. Exercise group participated in the vertical jump training program for four weeks (Twelve 40-minute sessions). Using largest finite- time Lyapunov exponent; a nonlinear method; local dynamic stability of hip and knee angular positions was calculated. The results showed that following increase in vertical jump height, selected protocol training significantly improved the dynamical stability of the knee joint. It seems, increasing vertical jump height following training, leading to greater stability of the knee joint rather than the hip.
کلیدواژه‌ها [English]
- Vertical Jump
- Local Dynamic Stability
- Joint Kinematics
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