بررسی غیرخطی پایداری دینامیک موضعی فعالیت الکتریکی عضلات اندام تحتانی پس از کشش ایستا و پویا در مردان فعال حین رکاب زدن

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار گروه بیومکانیک ورزشی، دانشکده علوم ورزشی، دانشگاه خوارزمی، تهران، ایران.

2 استاد گروه بیومکانیک ورزشی، دانشکده علوم ورزشی، دانشگاه خوارزمی، تهران، ایران.

3 دانشیار گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه خوارزمی، تهران، ایران.

چکیده

زمینه و هدف: مطالعات گذشته در زمینه تاثیر کشش­های ایستا و پویا بر عملکرد نتایج متناقضی ارائه داده­ اند. در مطالعه حاضر با استفاده از روش­ های نوین تحلیل غیرخطی تاثیر این دو کشش بر فعالیت الکتریکی عضلات اندام تحتانی بررسی شد. هدف از این مطالعه بررسی غیرخطی پایداری دینامیک موضعی فعالیت الکتریکی عضلات اندام تحتانی پس از کشش ایستا و پویا در مردان فعال حین رکاب زدن بود. روش تحقیق: 15 دانشجوی پسر (وزن 10/52±69/02 کیلوگرم، قد 6/74±174/00 سانتی­متر و سن 1/47±21/20 سال) علوم ورزشی به صورت داوطلبانه در این مطالعه شرکت کردند. آزمودنی­ ها در طی دو روز با اختلاف 48 ساعت در هر مراجعه به آزمایشگاه مراجعه کردند و در حالت­ های بدون کشش و پس از گذشت 2، 5 و 10 دقیقه از کشش ایستا و پویا، اطلاعات فعالیت الکتریکی شش عضله اندام تحتانی آن ها در 30 چرخه رکاب زدن روی چرخ کارسنج ثبت شد. اطلاعات فیلتر شده فعالیت الکتریکی عضلات، جهت ساختن سری زمانی و محاسبه نمای لیاپانوف استخراج شدند. یافته­ ها: نتایج آزمون تحلیل واریانس با اندازه­ گیری تکراری نشان داد نمای لیاپانوف فعالیت الکتریکی عضلات منتخب در وهله­ های 2، 5 و 10 دقیقه پس از کشش پویا در مقایسه با حالت کشش ایستا و بدون کشش به طور معنی­ داری کاهش یافت (0/05≥p). نتیجه گیری: به نظر می­ رسد استفاده از کشش پویا به جای کشش ایستا در برنامه گرم کردن قبل از رکاب زدن یا انجام بازتوانی روی دوچرخه ثابت بهتر باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Nonlinear evaluation of local dynamic stability in lower extremity EMG after statics and dynamics stretching in active males during pedaling

نویسندگان [English]

  • Ali Abbasi 1
  • Heydar Sadeghi 2
  • Mehdi Zamanian 3
1 Assistant Professor, Sport Biomechanics Department, Faculty of Sport Sciences, Kharazmi University, Tehran, Iran.
2 Professor, Sport Biomechanics Department, Faculty of Sport Sciences, Kharazmi University, Tehran, Iran.
3 Associate Professor, Department of Mechanical Engineering, Faculty of Engineering, Kharazmi University, Tehran, Iran.
چکیده [English]

Background and Aim: Previous studies about the effect of static and dynamic stretching on forthcoming performance have been reported different results. In present study, it has been evaluated the effects of these two stretching on lower extremity muscular electrical activity using innovative nonlinear analysis methods. The purpose of present study was to examine nonlinear evaluation of local dynamic stability in lower extremity EMG after statics and dynamics stretching in active males during pedaling. Materials and Methods: Fifteen physical education and sport sciences male students voluntarily participated in this study. Subjects referred to the laboratory during two days, with 48 hours intervals between each sessions, and EMG data from six lower extremity muscles were collected from 30 pedaling cycle on the stationary cycle in situation of without stretching, and after 2, 5 and 10 minutes post stretching. Filtered EMG data were extracted for constructing time series and Lyapunov Exponent (LyE) calculation. Results: Results of repeated measure ANOVA showed significant reduction in selected muscles EMG LyE during 2, 5 and 10 min post dynamic stretching compare to static stretching and no stretching conditions (p≤0.05). Conclusion: Regarding results, probably it is better to use dynamic stretching versus static stretching in warm up programs before pedaling or rehabilitation on stationary cycle.

کلیدواژه‌ها [English]

  • Static stretching
  • Dynamic stretching
  • Pedaling
  • Lyapunov exponent

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