نوع مقاله : مقاله پژوهشی
نویسندگان
1 دکترای بیومکانیک ورزشی، دانشکده علوم ورزشی، دانشگاه خوارزمی، تهران، ایران.
2 استاد تمام دانشکده علوم ورزشی، گروه بیومکانیک ورزشی، دانشگاه خوارزمی، تهران، ایران.
3 استادیار گروه فیزیوتراپی، دانشکده علوم توانبخشی، دانشگاه علوم پزشکی شیراز، شیراز، ایران.
4 استادیار گروه علوم ورزشی، دانشکده علوم تربیتی و روانشناسی، دانشگاه شیراز، شیراز، ایران.
چکیده
زمینه و هدف: انقباض برون‌گرا از لحاظ مکانیکی کارایی‌‌اش بیشتر بوده اما استراتژی فعال‌سازی منحصر بفردی را به کار می‌گیرد که عضله را مستعد آسیب می‌کند. کنترل قامت در بسیاری از فعالیت های ورزشی و روزمره ضروری می‌باشد. هدف از مطالعه حاضر، بررسی تاثیر فعالیت برون‌گرا حاد آسیب‌زا با سرعت انقباض بالای عضله بازکننده زانوی پای برتر بر شاخص‌های آسیب عضلانی و کنترل قامت در دختران جوان تمرین کرده بود. روش تحقیق: 10 دختر جوان (1/66±21/9 سال) تمرین‌کرده به‌طور داوطلبانه در این تحقیق شرکت کردند. جهت ایجاد آسیب عضلانی، آزمودنی‌ها 300 انقباض برون‌گرا با شدت 150 درصد حداکثر گشتاور هم‌طول و سرعت ﾟ/s240 را بر روی عضلات بازکننده زانوی پای برتر انجام دادند. شاخص‌های آسیب عضلانی (حداکثر گشتاور هم‌طول، میزان درد، محیط ران)، کنترل قامت (مسافت و سرعت حرکت مرکز فشار در دو محور) قبل، یک و 48 ساعت پس از فعالیت برون‌گرا اندازه‌گیری شدند. تجزیه و تحلیل آماری با استفاده از نرم افزار 16SPSS و آزمون آنالیز واریانس با اندازه‌گیری مکرر، انجام گردید. یافته‌ها: تمامی شاخص‌های آسیب عضلانی مورد مطالعه، متعاقب فعالیت برون‌گرا به طور معنی‌داری تغییر یافت (0/05>p) که نشان دهنده ایجاد آسیب عضلانی بود. بر خلاف آن، تفاوت معنی‌داری بین مسافت و سرعت حرکت مرکز فشار در دو محور، قبل، یک و 48 ساعت پس از فعالیت برون‌گرا مشاهده نشد. نتیجه‌گیری: در مجموع نتایج تحقیق حاضر نشان داد که فعالیت برون‌گرا آسیب‌زا با سرعت بالا که به طور خاص بر روی عضله بازکننده زانو انجام شود، کنترل قامت دختران جوان تمرین‌کرده در ایستادن تک پا را تحت تاثیر قرار نمی‌دهد.
کلیدواژه‌ها
عنوان مقاله [English]
The effect of high velocity acute eccentric exercise-induced muscle damage of dominant knee extensors on muscle damage indices and postural control in young trained females
نویسندگان [English]
- farzaneh movaseghi 1
- Heydar Sadeghi 2
- Sobhan Sobhani 3
- Javad Nemati 4
1 PhD Student of Sports Biomechanic, Faculty of Sports Science, Kharazmi University, Tehran, Iran.
2 Full Professor, Faculty of Sports Science, Kharazmi University, Tehran, Iran.
3 Assistant Professor, Department of Physiotherapy, School of Rehabilitation Sciences, Shiraz University of Medical Sciences, Shiraz, Iran.
4 Assistant Professor, Department of Sport Sciences, Faculty of Educational and Psychology, Shiraz University, Shiraz, Iran.
چکیده [English]
Background and Aim: Eccentric muscle action has more mechanically efficiency, predisposes the muscle to damage due to unique activation strategy. Postural control also is necessarily required for many daily and sport activities. The purpose of this study was to investigate the effect of high velocity acute eccentric exercise-induced muscle damage of dominant knee extensors on muscle damage indices and postural control in trained young females. Materials and methods: Ten young trained females (21.9±1.66 years) voluntarily participated in this study. To analyse muscle damage, subjects performed 300 (20 sets, 15 repetitions) high velocity (240°.s-1) eccentric contractions of dominant knee extensors with a load equal to 150٪ of the maximal voluntary isometric torque (MVC).Muscle damage indices (MVC, perceived pain, thigh circumference) and center of pressure distance and velocity in the antero/posterior (AP) and the medio/lateral (ML) planes of movement were recorded before, 1 and 48 h after eccentric exercise. Statistical analysis was performed with SPSS (version 16.0), and the repeated-measures ANOVA test also were used. Results: All muscle damage indicators changed significantly (p<0.05) following eccentric exercise thats confirmed muscle damage. In contrast, no significant differences was observed for center of pressure distance and velocity in the AP and ML directions between all measured time points (p>0.05). Conclusion: In conclusion, the results of the present study showed that high velocity eccentric exercise that designed to elicit localized muscle damage of dominant knee extensors did not influence postural control during one-legged stance in trained young female.
کلیدواژه‌ها [English]
- Eccentric exercise induced muscle damage
- High velocity contraction
- Muscle damage indices
- Postural control
- Young females
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