نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی کارشناسی‌ارشد امدادگر ورزشی، دانشگاه تهران
2 استاد آسیب‌شناسی ورزشی و حرکات اصلاحی، دانشگاه تهران
چکیده
هدف این پژوهش، مقایسة زمان شروع، فعالیت فیدفورواردی، فعالیت فیدبکی و اندازة فعالیت منتخبی از عضلات زانوی ورزشکاران مرد دانشگاهی مبتلا به محدودیت دامنة حرکتی دورسی فلکشن و سالم در پرش و فرود تک‌پا بود. 30 آزمودنی از سه رشتة بسکتبال، والیبال و هندبال به دو گروه کنترل و آزمایشی تقسیم شدند. در پرش فرود تک‌پا، زمان شروع، فعالیت فیدفورداری، فیدبکی و اندازة فعالیت پنج عضلة راست رانی، پهن داخلی، پهن خارجی، دوسررانی و نیم وتری با استفاده از روش الکترومایوگرافی اندازه‌گیری شدند. یافته‌ها نشان داد که در هر چهار عامل زمان شروع، فعالیت فیدفورداری، فعالیت فیدبکی و اندازة فعالیت عضلات منتخب زانو، بین ورزشکاران با محدودیت دورسی‌فلکشن در مچ پا با ورزشکاران سالم تفاوت معناداری وجود ندارد. نظریة زنجیرة حرکتی بیانگر این است که نقص در یک بخش از زنجیره می‌تواند موجب تغییر فعالیت عضلات شود؛ اما یافته‌های پژوهش حاضر نشان داد که در فعالیت عملکردی پرش تک‌پا چنین تفاوتی در فعالیت عضلات منتخب وجود ندارد
کلیدواژه‌ها
عنوان مقاله [English]
The Comparison of Selective EMG Indicators of Thigh in Athletes with and Without Limited Ankle Dorsiflexion in a Single-Leg Jump Task
نویسندگان [English]
- Shahab Alizadeh 1
- Mohammad Hossein Alizadeh 2
- Reaz Rajabi 2
1 M. Sc. in Sports Injuries, University of Tehran
2 Professor of Sports Injuries and Corrective Exercises, University of Tehran
چکیده [English]
The aim of this study was to compare knee muscle onset, feedforward, feedback and pattern of the activity in colligate athletes who suffer from limited ankle dorsiflexion range of movement in a single leg jump landing task. 30 subjects from basketball, volleyball and handball participated in this study and were divided into 2 control and experimental groups. In a single leg jump landing task, the onset and amplitude activity of Vastus Lateralis Oblique (VLO), Vastus Medialis Oblique (VMO), Rectus Femoris (RF), Bicep Femoris (BF) and Semi Tendenisous (ST) were measured using surface electromyography. The results show that there were no significant differences for onset, feedfowrad, feedback and amplitude activity of the selected knee muscles between the control and experimental group. Although the theory of closed chain kinematics declares that if there is a defect in one of the kinematic chains other chains would be influenced as in muscle activity, but the current study shows that there were no significant difference between the feedforward, feedback, amplitude and onset activation for knee muscles between athletes with and without limited ankle dorsiflexion range of motion.
کلیدواژه‌ها [English]
- SEMG
- Knee muscles
- Dorsiflexion
- Onset
- Activity
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