نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار گروه تربیت بدنی و علوم ورزشی، دانشگاه پیام نور، تهران، ایران.
2 استادیار دانشکده تربیت بدنی و علوم ورزشی، دانشگاه شهید بهشتی، تهران، ایران.
3 استادیار دانشکده تربیت بدنی و علوم ورزشی، دانشگاه خوارزمی، تهران، ایران
4 دانشیار دانشکده توانبخشی، دانشگاه ایران، تهران، ایران
5 دانشیار دانشکده تربیت بدنی و علوم ورزشی، دانشگاه شهید بهشتی، تهران، ایران
چکیده
زمینه و هدف: تمرینات پلایومتریک احتملاً منجر به افزایش عملکرد و کاهش خطر آسیب در زنان ورزشکار می شود، اما اثرات آن بر روی بی ثباتی عملکردی مچ پا نامشخص است. هدف این تحقیق بررسی تأثیر شش هفته تمرین پلایومتریک بر عملکرد و زمانبندی فعالیت عضلات منتخب ساق پای زنان فعال مبتلا به بی ثباتی عمکردی مچ پا در فرود تک پا بود.
روش تحقیق: الکترومیوگرافی سطحی از عضلات نازک نئی بلند، درشت نئی قدامی و دوقلوی داخلی در 30 زن فعال مبتلا به بی ثباتی عملکردی مچ پا ثبت شد. جهت ارزیابی کنترل وضعیتی پویا نیز از آزمون تعدیل شده ستاره استفاده شد. در این تحقیق از برنامه‌ی تمرینات پلایومتریک پی هانگ (2014) به مدت شش هفته و 18 جلسه استفاده شد. جهت تجزیه و تحلیل آماری داده ها از آزمون های تی مستقل و وابسته در سطح معنی داری 95 درصد در نرم افزار SPSS نسخه 20، استفاده شد.
یافته ها: نتایج بیانگر افزایش معنی دار در زمان شروع فعالیت عضله نازک نئی بلند (036/0=p)، بهبود کنترل وضعیتی پویا (قدامی (001/0=p)، خلفی داخلی (001/0=p) و خلفی خارجی(021/0=p)) و عدم تغییر در فعالیت عضلات درشت نئی قدامی (831/0=p) و دوقلوی داخلی(618/0=p) پس از شش هفته تمرین پلایومتریک بود.
نتیجه گیری: تمرینات پلایومتریک با تسریع زمان واکنش در مرحلۀ پیش از فرود منجر به تغییر در زمانبندی فعالیت عضله نازک نئی بلند و کنترل وضعیتی پویا می شود که احتمالاً می‌تواند عملکرد اندام تحتانی افراد مبتلا به بی ثباتی عملکردی مچ پا را بهبود بخشد.
کلیدواژه‌ها
عنوان مقاله [English]
The effect of 6 weeks of plyometric training on dynamic postural control and timing of selective calf muscles in females with ankle instability.
نویسندگان [English]
- Somayeh Momeni 1
- Amir Hossein Barati 2
- Amir Letafatkar 3
- Ali Ashraf Jamshidi 4
- Fariborz Howanloo 5
1 Assistsnce Professor, Facollty of Physical Educabion and Sport Sciences, Payme Noor University, Tehran, Iran.
2 Assistance Professor, Faculty of Physical Education and Sport Sciences, Shahid Beheshti University, Tehran, Iran
3 Assistance Professor, Faculty of Physical Education and Sport Sciences, Kharazmi University, Tehran, Iran
4 Associate Professor, Faculty of Physical Therapy, Iran University, Tehran, Iran
5 Associate Professor, Faculty of Physical Education and Sport Sciences, Shahid Beheshti University, Tehran, Iran
چکیده [English]
Backgrounds and Aim: Plyometric exercises may increase performance and decrease injury risk in female athletes, but its effects on functional ankle instability is unclear. The aim of this study was to evaluate the effect of six weeks of plyometric training on dynamic postural control and timing of selective calf muscles activation in active females with functional ankle instability in single leg drop landing. Materials and Methods: surface electromyography was recorded from peroneus longus, tibialis anterior and medial gastrocnemius muscles of 30 active females with functional ankle instability. Modified Star excursion test were used for evaluation of the dynamic postural control. In current study, we used the Pi-Huang (2014) plyometric training protocol for six weeks and 18 sessions. Paired and sample t tests in significant level of 95% were used for statistical analysis in SPSS software version 20. Results: The results indicating a significant increasing in the peroneus longus muscle activity (p=0.036), improving dynamic postural control (Anterior (p=0.001), posterior-medial (p=0.001) and posterior- lateral (p=0.021)) and also no significant changes in onset of tibialis anterior (P=0.831) and medial gastrocnemius (P=0.618) muscles activity after the six-week plyometric training. Conclusion: Plyometric training with accelerating the reaction time in prelanding phase, could modified the timing of peroneus longus muscle and dynamic postural control that may improve the lower extremity performance in patients with functional ankle instability.
کلیدواژه‌ها [English]
- " functional ankle instability"
- "electromyography"
- " dynamic postural control"
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