مقایسة تأثیر شدت‌های متفاوت انقباض درون‌گرا و برون‌گرا بر الگوی فعالیت عضلات سینرژیک چهارسر ران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناس ارشد فیزیولوژی ورزشی، گروه تربیت بدنی، دانشگاه بجنورد، بجنورد، ایران

2 دانشیار آسیب شناسی و حرکات اصلاحی، گروه تربیت بدنی، دانشگاه بجنورد، بجنورد، ایران

3 .استادیار رفتار حرکتی- کنترل حرکتی، گروه تربیت بدنی، دانشگاه بجنورد، بجنورد، ایران

چکیده

زمینه و هدف  تقویت انتخابی عضلات سینرژیک چهارسر ران، اهمیت بسزایی در بهبود عملکرد این عضله و به‌ویژه در پیشگیری از سندرم کشککی رانی دارد. بنابراین هدف تحقیق حاضر، بررسی الگوی فعالیت عضلات پهن داخلی و پهن خارجی در پاسخ به شیوه انقباضی درون‌گرا با شدت زیربیشینه و انقباض برون‌گرا با شدت فوق‌بیشینه بود.
مواد و روش‌ها 12 دانشجوی پسر 2±21سال، قد 12±173 سانتی متر و وزن 8±71 کیلوگرم، بصورت تصادفی در دانشگاه بجنورد انتخاب شدند. فعالیت عضلات چهار سر ران در حین انقباض با شدت های مختلف، با استفاده از دستگاه الکترومیوگرافی ثبت گردید. تجزیه و تحلیل داده ها با استفاده از آزمون آماری تحلیل واریانس چند متغیره و آزمون تعقیبی توکی در سطح معنی داری05/0  p<انجام گردید.
یافته‌ها میزان فعالیت الکترومیوگرافی عضلات با افزایش بار کار در انقباض برون‌گرا، به طور معنی‌داری نسبت به انقباض درون‌گرا افزایش می‌یابد که احتمالاً بیانگر این موضوع می‌تواند باشد که تمرینات مقاومتی فزاینده با استفاده از انقباض فوق‌بیشینه برون‌گرا مؤثرتر از انقباض زیربیشینه درون‌گرا برای ایجاد پاسخ‌های عصبی عضلانی هستند.
نتیجه‌گیری یک اثر متقابل معنی‌دار بین نوع عضله و شدت انقباض برای فعالیت الکترومیوگرافی عضلات وجود دارد؛ به طوری که در شدت زیربیشینه، میزان فعالیت الکترومیوگرافی پهن داخلی نسبت به پهن خارجی به طور معنی‌داری بیشتر بود ولی در شدت فوق بیشینه، چنین تفاوت معنی‌داری مشاهده نشد که می‌تواند بیانگر امکان تقویت انتخابی عضله پهن داخلی در شدت زیربیشینه باشد که برای پیشگیری از سندرم کشککی رانی، از اهمیت بسزایی برخوردار است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The effect of different intensities of eccentric and concentric contraction on the pattern of the quadriceps synergistic muscles activity

نویسندگان [English]

  • hamid yazdazar 1
  • nosratollah hedayatpour 2
  • Mahta Sardroodian 3
1 Master of Exercise Physiology, Department of Sport sciences, University of Bojnord
2 Associate Professor in Sport injuries and Corrective exercises, Department of Sport sciences, University of Bojnord
3 Assistant Professor in Motor behavior- Motor control, Department of Sport sciences, University of Bojnord
چکیده [English]

Introduction: Selective muscle strengthening of quadriceps synergistic muscles is important to improve muscle performance specially to prevent Patella- femoral syndrome. Therefore, the aim of this study was to investigate the pattern of the Vastus medialis and Vastus lateralis activity in response to the intensities of super maximal eccentric and submaximal concentric contractions.
Materials and Methods: 12 healthy men students randomly selected (21±2 years, 173±12 cm, and 71±8 kg) from University of Bojnord.  Electromyography activity of quadriceps muscles was measured during contraction by using electromyography system. To evaluate the date, the Multivariate variance (MANOVA) and post hoc test (TUCKY) were applied at p˂0.05.
Results: The data analysis was demonstrated the electromyography activity of Vastus medialis and Vastus lateralis were significantly increased with an increased work load during the eccentric contraction rather than concentric contraction which suggests that progressive resistance training using super maximal eccentric contraction is more effective than submaximal concentric contraction to create the neuromuscular adaptations.
Conclusion: Furthermore, it was observed a significant interaction between muscle type and contraction intensity for muscle electromyography activity. Since, during the submaximal contraction, the EMG activity of Vastus medialis was significantly higher than Vastus lateralis, while it was not the case during super maximal contraction, which could indicate the possibility of selective muscle strengthening of Vastus medialis in sub-maximal intensity to prevent patella-femoral syndrome.

کلیدواژه‌ها [English]

  • Intensity of contraction
  • Concentric contraction
  • Eccentric contraction
  • Quadriceps muscles
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