مقایسه کنترل پاسچر پای برتر و غیر برتر زنان کاتاکا و کومیته کای عضو تیم ملی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 کارشناس ارشد بیومکانیک ورزشی، دانشکدة تربیت بدنی و علوم ورزشی، دانشگاه خوارزمی تهران، ایران

2 استاد گروه بیومکانیک ورزشی، دانشکدة تربیت بدنی و علوم ورزشی، دانشگاه خوارزمی تهران، ایران

3 استادیار گروه بیومکانیک ورزشی، دانشکدة تربیت بدنی و علوم ورزشی، دانشگاه خوارزمی تهران، ایران

چکیده

زمینه و هدف: کنترل پاسچر در اکثر ورزش‌ها به‌ویژه کاراته، اهمیت به سزایی دارد. به نظر می‌رسد سابقه فعالیت در ورزش کاراته روی شاخص هایی نظیر تعادل بین دو اندام تحتانی تأثیرگذار است. هدف پژوهش حاضر مقایسه کنترل پاسچر پای برتر و غیر برتر زنان کاتاکا و کومیته‌کای تیم‌ملی کاراته تحت شرایط مختلف حسی بود. روش تحقیق: 12 کومیته‌کا و 8 کاتاکای عضو تیم‌ملی  کاراته بانوان در سال 1392 به عنوان آزمودنی انتخاب شدند. قوس کف پای آزمودنی‌ها حین راه‌رفتن با پای برهنه روی پلت فورم ایمد و نوسانات پاسچر با دستگاه تعادل سنج بایودکس حین ایستادن تک پا با چشمان باز و بسته در سطح پایدار و ناپایدار ،سنجیده شد. آزمون تحلیل واریانس با اندازه‌های مکرر برای مقایسه متغیرها استفاده گردید و سطح معنی دار 0/05 منظور گردید. یافته‌ها: زمانی که نوسانات پاسچر با چشم باز بررسی شد، تفاوت معنی داری بین پای برتر و غیر برتر مشاهده نشد (0/05<p )؛ اما وقتی بینایی حذف گردید، شاخص‌های پایداری کلی (0/02=p) و داخلی- خارجی (0/03=p) در سطح ناپایدار تفاوت معنی دار داشتند. به علاوه، بین دو گروه در هیچ‌کدام از شرایط حسی تفاوت معنی داری (0/05<p ) مشاهده نشد. نتیجه گیری: به نظر می‌رسد ملاک قرار دادن تعادل برای انتخاب رشته کاتا و کومیته، چندان مناسب نیست؛ زیرا در سطح بالای عملکردی، تفاوتی بین افراد کاتاکا و کومیته­کا وجود ندارد. همچنین ممکن است برتری یک پا و به طبع آن استفاده نابرابر از پاها روی تعادل تاثیر بگذارد به طوری که احتمالاً تعادل بهتر کاراته‌کاران روی پای غیر برتر به علت بهبود حس عمقی این پا است. در نهایت، احتمالا بین سازگاری منفی دستگاه عضلانی- اسکلتی با الگوهای تکراری مهارت در ورزشکاران رابطه وجود دارد و این موضوع مستلزم پرکردن خلا موجود در زمینه شناخت، پیشگیری و درمان این پدیده می باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Comparison of postural stability in dominant & non-dominant leg of female kata and kumite national team

نویسندگان [English]

  • Elnaz Dizaji 1
  • Heydar Sadeghi 2
  • Raghad Memar 3
1 MSc in Sport Biomechanics, Faculty of Physical Education and Sport Sciences, Kharazmi University, Tehran, Iran
2 Full Professor, Department of Sport Biomechanics, Faculty of Physical Education and Sport Sciences, Kharazmi University, Tehran, Iran
3 Assiastant Professor, Department of Sport Biomechanics, Faculty of Physical Education and Sport Sciences, Kharazmi University, Tehran, Iran
چکیده [English]

Background and Aim: Postural control is very important in most sports, especially karate. It seems that the history
of prolonged karate exercises affect parameters such as the balance in contralateral lower limbs. So, the aim of this
study was to compare the postural stability in dominant & non-dominant leg of female kata and kumite national team
with sensory interference. Materials and Methods: 12 kumite and 8 kata female karate athletes in 2013 national team
participated in this study. Medial longitudinal arch of foot were measured using emed platform during barefoot walking.
Postural stability was assessed using biodex stability system during unilateral standing with opened-eye and closedeye
in stable and unstable surface. Repeated measures analysis of variance was used to compare parameters and the
level of statistical significance considered if pexamined, there was no significant difference between dominant and non-dominant leg (p>0.05); but when visual’s
elimination was applied, significant differences have been observed in overall (p=0.02) and mediolateral (p=0.03) stability indices in unstable surface. No difference was found in any of the sensory challenge between two groups (p>0.05). Conclusion: It seems that balance isn't suitable factors for selecting kata or kumite as a talent identification characteristics. because it does not make difference between two groups in higher levels of performance . Also leg’s dominance and resulting unequal use of legs may affect balance that perhaps karate-ka higher balance of non-dominant leg is caused by better proprioception. Finally, perhaps there is a relationship between the negative adaptation of musculo-skeletal system and athletes' repetitive patterns of skills that leads to bridge the gap in understanding, prevention and treatment of this phenomenon.

کلیدواژه‌ها [English]

  • Kata & Kumite
  • Dominant and non-dominant leg
  • Postural stability
  • Sensory interference

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