نوع مقاله : مطالعه پژوهشی اصیل
نویسندگان
1 استاد رفتار حرکتی، دانشگاه فردوسی مشهد
2 دکتری رفتار حرکتی، دانشگاه فردوسی مشهد
3 استادیار رفتار حرکتی، دانشگاه علامه طباطبائی تهران
چکیده
هدف از این پژوهش بررسی تأثیر انسداد تحت‌فشار روانی بر تغییرپذیری حرکتی و تثبیت (رهاسازی) درجات آزادی در بازیکنان ماهر و مبتدی تنیس روی میز بود. بدین منظور 16 بازیکن تنیس روی میز (هشت نفر ماهر و هشت نفر مبتدی) به صورت در دسترس انتخاب شدند و در دو حالت شرایط عادی و شرایط استرس ده ضربه تاپ اسپین به سمت هدفی مشخص انجام دادند. متغیر تغییرپذیری درون اندامی و جفت شدن بین مفاصل محاسبه شد. نتایج نشان داد که تغییرپذیری حرکتی برای گروه ماهر نسبت به گروه مبتدی پایینتر بود اما در دو شرایط (عادی و استرس) تفاوت معناداری وجود نداشت. جفت شدن بین مفاصل نیز برای گروه ماهر نسبت به گروه مبتدی پایینتر بود. علاوه بر این نتایج نشان داد شرایط استرس سبب بالا رفتن جفت شدن بین مفاصل در دو گروه ماهر و مبتدی میشود. این نتایج بر اساس دیدگاه هماهنگی و کنترل و همچنین دیدگاه تثبیت و رهاسازی درجات آزادی توجیه شدند. به طور کلی افراد در شرایط فشار روانی ممکن است به استراتژی مبتدیانه تثبیت درجات آزادی بازگردند.
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
The Effect of Chocking under Pressure on Movement Variability and Freezing (freeing) of Degrees of Freedom in Skilled and Novice Table Tennis Players
نویسندگان [English]
- Hamidreza Taheri 1
- Davoud Fazeli 2
- Mohammadreza Ghasemian Moghadam 3
1 Professor of Motor Behavior, Ferdowsi University of Mashhad
2 Ph.D. of Motor Behavior, Ferdowsi University of Mashhad
3 Assistance Professor of Motor Behavior, Allameh Tabataba’i University
چکیده [English]
The purpose of this study was to investigate the effect of chocking under mental pressure on movement variability and freezing (freeing) of degrees of freedom in skilled and novice table tennis players. To this purpose 16 table tennis players (8 skilled and 8 novice) were selected by in access method and performed 10 top spine strike under general and stress conditions. The measures of intra-limb variability and coupling were calculated. Results showed that movement variability for skilled group is lower than novice group, but there is no difference between two conditions (general and stress). The joint coupling was also lower for skilled group than novices. Furthermore, the results showed that stress condition leads to higher coupling between joints in skilled and novice groups. These results were interpreted according to coordination and control view and also according to the view of freezing and freeing degrees of freedom. Generally, in mental pressure situations participants may return to novice strategy to freeze degrees of freedom.
کلیدواژه‌ها [English]
- Chocking Under Pressure
- Movement Variability
- Joints Coupling
- Freezing Degrees of Freedom
- Coordination
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