تغییر در زاویه بهینه تولید گشتاور اکستانسوری زانو متعاقب تکرار تمرینات اکسنتریک با شدت حداکثر

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار، دپارتمان فیزیوتراپی،دانشکده توانبخشی،تبریز. ایران

2 استادیار، دانشکده توانبخشی، دانشگاه علوم پزشکی ایران، تهران، ایران

3 استاد، دانشکده توانبخشی، دانشگاه علوم پزشکی ایران، تهران، ایران

4 دانشیار، دانشکده توانبخشی، دانشگاه علوم پزشکی ایران، تهران، ایران

5 استادیار، گروه کاردرمانی، دانشکده توانبخشی، دانشگاه علوم پزشکی تبریز، تبریز، ایران

چکیده

زمینه و اهداف
هدف از مطالعه حاضر بررسی تغییرات در زاویه بهینه گشتاور و تظاهرات صدمه عضلانی ناشی از تکرار تمرینات اکسنتریک اکستانسوری زانو با شدت حداکثر بود.
روشبررسی
15 زن تمرین نکرده سالم دو مرتبه تمرین اکسنتریک با شدت حدکثر (6 ست * 20 تکرار) را با فاصله دو هفته در اکستانسورهای زانو انجام دادند. گشتاورهای ایزومتریک و کانسنتریک اکستانسوری، زاویه بهینه گشتاورها، آزردگی عضلانی تاخیری، دامنه حرکتی زانو و محیط ران در فواصل زمانی قبل و بلافاصله 48 ساعت و 5 روز بعد از تمرینات اندازه­گیری شد.
یافته­ ها
افت درگشتاورها و دامنه حرکتی، افزایش زاویه بهینه، آزردگی عضلانی تاخیری پس از مرتبه اول تمرین اکسنتریک مشهود بود. پس از مرتبه دوم تمرین اکسنتریک، افت گشتاورهای کانسنتریک و دامنه حرکتی کمتر شد. زاویه بهینه در سرعت 60 درجه بر ثانیه افزایش یافت و آزردگی عضلانی تاخیری بعد از مرتبه دوم تمرین اکسنتریک در زمان 48 ساعت به صورت معناداری کمتر از مرتبه اول بود (05/0>P).
نتیجه­ گیری
صدمه عضلانی ناشی از تمرین اکسنتریک پس از مرتبه اول تمرین مشهود بود. اثر تکرار تمرین در مرتبه دوم تمرین مشاهده شد. تغییرات در زاویه بهینه به صورت غیرمستقیم نشان­دهنده نقش مکانیسم­های سلولی در روند سازگاری به تمرینات اکسنتریک است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Change of Optimum Angle for Torque Production after Repeated Bouts of Maximal Intensity Eccentric Exercises

نویسندگان [English]

  • Mandana Rezaei 1
  • Behnoush Vassaghi-Gharamaleki 2
  • Ismael Ebrahimi- Takamjani 3
  • Ali A. Jamshidi 4
  • Naser Havaei 5
1 2. Assistant Professor, Department of Physical Therapy, School of Rehabilitation, Tabriz University of Medical Sciences, Tabriz, Iran
2 Assistant Professor, School of Rehabilitation, Iran University of Medical Sciences, Tehran, Iran
3 Full Professor, School of Rehabilitation, Iran University of Medical Sciences, Tehran, Iran, Rehabilitation Research Center, Biomechanics Lab, Iran University of Medical Sciences, Tehran, Iran
4 Associate Professor, School of Rehabilitation, Iran University of Medical Sciences, Tehran, Iran
5 Assistant professor, department of occupational therapy, school of rehabilitation, tabriz university of medical sciences, tabriz, iran
چکیده [English]

Background and aim: The purpose of the present study was to evaluate the effect of repeated bouts of maximal intensity eccentric exercise at knee extensors on optimum angle and eccentric exercise-induced muscle damage indicators.
Materials and Methods: A total of 15 untrained healthy females performed two bouts of maximal intensity eccentric exercises (6 sets*20 repetitions) at knee extensors with the time interval of two weeks. Isometric and concentric extensor torques, optimum torque angles, delayed onset muscle soreness, knee range of motion, and thigh circumference were measured before and immediately, 48 hours, and 5 days after two bouts of eccentric exercises.
Results: Reduction of torques and range of motion, increase in optimum angle, and delayed onset muscle soreness were significant after the first bout of eccentric exercise. After the second bout, reductions in concentric torques and range of motion were less. Optimum angle at the velocity of 60 degree per second was increased and delayed onset muscle soreness was decreased at 48 hours after the second bout compared with that after the first bout (P<0.05).
Conclusion: Eccentric exercise induced muscle damage was evident after the first bout of eccentric exercise. Also, repeated bout effect was observed after the second bout. A change of optimum angle indirectly indicates the roll of cellar mechanisms in adaptation process to eccentric exercises. 

کلیدواژه‌ها [English]

  • Exercise
  • eccentric
  • eccentric exercise-induced muscle damage
  • optimum angle
  • repeated bout effect
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