نوع مقاله : مقاله پژوهشی Released under CC BY-NC 4.0 license I Open Access I
نویسندگان
1 کارشناس‌ارشد فیزیولوژی ورزشی،گروه فیزیولوژی ورزشی، دانشکدۀ تربیت بدنی و علوم ورزشی، دانشگاه تربیت دبیر شهید رجایی
2 دانشجوی دکتری فیزیولوژی ورزشی، گروه فیزیولوژی ورزشی، دانشکدۀ تربیت بدنی و علوم ورزشی، دانشگاه بوعلی سین
3 دانشیار، گروه بیومکانیک ورزشی، دانشکدۀ تربیت بدنی و علوم ورزشی، دانشگاه بوعلی سینا
4 دانشجوی کارشناسی‌ارشد فیزیولوژی ورزشی، گروه فیزیولوژی ورزشی، دانشکدۀ تربیت بدنی و علوم ورزشی
چکیده
هدف از این پژوهش تعیین اثر شدت اجرای یک نوبت نیماسکوات پویا بر عملکرد و فعالیت الکتریکی عضلانی در جریان پرش عمودی نوجوانان ورزشکار بود. آزمودنیهای این پژوهش 12 پسر نوجوان ورزشکار بودند که در سه روز متفاوت به‌طور تصادفی یکی از سه پروتکل گرم کردن (کنترل)، گرم کردن و اجرای یک نوبت 2 تکراری نیماسکوات پویای با شدت کم (40 درصد 1RM)، گرم کردن و اجرای یک نوبت 1 تکراری نیماسکوات پویای با شدت زیاد (80 درصد 1RM) را انجام دادند. پس از گذشت 4 دقیقه از اجرای هر پروتکل، از آزمودنیها آزمون پرش عمودی به‌عمل آمد و فعالیت الکترومایوگرافی گروههای عضلانی چهارسر و همسترینگ در مرحلۀ درونگرای پرش به ثبت رسید. برای تجزیه‌وتحلیل دادهها از تحلیل واریانس با اندازههای تکراری استفاده شد. نتایج نشان داد که ارتفاع پرش و فعالیت الکترومایوگرافی عضلات چهارسر پس از پروتکل با شدت کم نسبت به پروتکل کنترل به‌طور معناداری افزایش یافت (05/0P≤). درحالی‌که تفاوت معنادار آماری بین اندازهگیریهای تکراری در فعالیت الکترومایوگرافی گروه عضلانی همسترینگ یافت نشد (05/0P>). بنابراین از طریق گرم کردن ویژه شامل نیماسکوات با شدتهای کم نسبت به‌گرم کردن معمول میتوان عملکرد پرش عمودی متعاقب را در نوجوانان ورزشکار بهبود بخشید که به‌نظر میرسد با تغییرات نورولوژیکی و درون‌عضلانی همراه باشد.
کلیدواژه‌ها
عنوان مقاله [English]
The Intensity Influence of Perform one Set Half Squat on Vertical Jump Performance and Muscle Electrical Activity in Adolescent Athletes
نویسندگان [English]
- Fatemeh Seydi 1
- Abbas Abdolmaleki 2
- Mehrdad Anbarian 3
- Reza Ghahramani 4
1 MSc of Exercise Physiology, Department of Exercise Physiology, Faculty of Physical Education and Sport Sciences, Shahid Rajaee Teacher Training University, Tehran, Iran
2 PhD Student of Exercise Physiology, Department of Exercise Physiology, Faculty of Physical Education and Sport Sciences, Bu-Ali Sina University, Hamedan, Iran
3 Associate Professor, Department of Sports Biomechanics, Faculty of Physical Education and Sport Sciences, Bu-Ali Sina University, Hamedan, Iran
4 MSc Student of Exercise Physiology, Department of Exercise Physiology, Faculty of Physical Education and Sport Sciences, Bu-Ali Sina University, Hamedan, Iran
چکیده [English]
The purpose of this study was to determine the intensity influence of perform one set half squat on vertical jump performance and muscle electrical activity in adolescent athletes. The subjects were 12 adolescent boys athletes. The subjects performed one set of dynamic half-squat using low and high intensities (LI= low intensity with 40% 1RM, HI= high intensity with 80% 1RM), and a control (C) warm up condition on randomized separating conditions over the course of different 3 days. After a 4 minutes post-protocols, the subjects completed a vertical jump test (VJ). The electromyographic (EMG) activity of quadriceps (Qc) and hamstring (H) were recorded during the concentric phase of the jumps. A one way ANOVA with repeated measures on the one factor was used to analyze the data. The results of this study indicated that the vertical jump height and Qc EMG activity had improved significantly (p ≤ 0.05) after LI protocol compared to C. No significant differences were found among the repeated measures in H EMG activity (p > 0.05). It is concluded that the use of a specific warm-up that includes half-squats, performed with low intensity, improves VJ performance that seems to be associated with the neurological and intramuscular changes.
کلیدواژه‌ها [English]
- postactivation potentiation
- Intensity
- vertical jump
- muscle electrical activity
- adolescent athletes
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