بررسی اثر هشت هفته تمرین مقاومتی یک طرفه بر قدرت، زمان واماندگی و هم انقباضی سینرژیست در عضلات خم کننده آرنج اندام تمرین کرده و تمرین نکرده

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار فیزیولوژی ورزشی- گروه فیزیولوژی ورزش، دانشکده علوم ورزشی، دانشگاه شمال، آمل، ایران

2 عضو هیئت علمی- گروه علوم ورزشی، دانشگاه هرمزگان، بندرعباس، ایران

3 کارشناس ارشد فیزیولوژی ورزشی دانشگاه شمال، دانشکده تربیت بدنی و علوم ورزشی، دانشگاه شمال، آمل، ایران

چکیده

مقدمه: تاثیر تمرینات یک طرفه بر استقامت عضلانی و مکانیسم اثرگذاری آن بطورکامل شناخته نشده است. هدف پژوهش حاضر تعیین تاثیر هشت هفته تمرین مقاومتی یک طرفه بر قدرت، زمان واماندگی، خستگی عصبی-عضلانی و هم انقباضی سینرژیست در عضو تمرین کرده و تمرین نکرده طرف مقابل بود.
روش پژوهش: ۲۰ دختر دانشجوی سالم بطور تصادفی در دو گروه کنترل و تجربی قرار گرفتند. آزمودنیهای گروه تجربی تمرین مقاومتی را روی فلکسورهای آرنج دست غیربرتر سه روز در هفته و به مدت هشت هفته انجام دادند. سیگنال الکترومیوگرافی سطحی از عضلات فلکسور آرنج دست تمرین کرده و قرینه درطول حداکثر انقباض ارادی و انقباض زیربیشینه ثبت شده و براساس مقادیر ریشه دوم میانگین (RMS) و میانگین توان فرکانس (MPF) و انتگرال الکترومیوگرافی(IEMG) در پیش آزمون و پس آزمون محاسبه گردید.
یافته‌ها: نتایج نشان دهنده افزایش معنی داری در حداکثر انقباض ارادی و زمان واماندگی درطول مهارت ایزومتریک زیربیشینه در عضو تمرین کرده و قرینه بود. تفاوت معنی داری بین دو گروه در مقادیر RMS و MPF عضله دوسربازویی عضو تمرین کرده و بدون تمرین وجود داشت که درمورد عضله بازویی قدامی و سه سربازویی در عضو تمرین نکرده وجود نداشت. همچنین بعد از تمرین مقاومتی تفاوت معنی داری در نسبت IEMG عضلات درگیر بین بلوکهای انقباض زیربیشینه هم در عضو تمرین کرده و هم قرینه وجود دارد که تمایل به تناوب را در فعالیت عضلات سینرژیست نشان میدهد.
نتیجه‌گیری: بخشی از اثرگذاری تمرین مقاومتی یک طرفه بر زمان واماندگی بواسطه بهبود مکانیسم الگوی تناوبی فعالیت سینرژیست توجیه می شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The effects of 8-weeks unilateral resistance training on strength, time to task failure, and synergist co-activation of elbow flexor Muscles in trained and untrained limbs

نویسندگان [English]

  • Taher Afsharnezhad 1
  • Alireza Amani 1
  • Masoud Khorsandi 2
  • Samereh Safar Zadeh 3
1 Assistant Professor of Exercise -Physiology, Department of Exercise Physiology, Faculty of Sport Science, Shomal University, Amol, Iran.
2 Faculty member of Sport Science, Health & Sport Science Department, Human Science Faculty, University of Hormozgan, BandarAbbas, Iran
3 MSc in Applied Exercise Physiology, Shomal University, Department of Exercise Physiology, Faculty of Sport Science, Shomal University, Amol, Iran
چکیده [English]

Introduction: The effect of cross training to improve endurance and its mechanism is not fully understood. The purpose of this study was to determine the effects of 8-weeks unilateral resistance training on strength, time to task failure, neuromuscular fatigue and synergist muscles co-activation in trained and contralateral untrained limbs.
Methods: 20 healthy female students were randomly assigned to either a training or a control group. The experimental group performed unilateral resistance training on non-dominant elbow flexors, 3 days per week for 8 weeks. The surface electromyography signal that was recorded from elbow flexor muscles during submaximal and maximal voluntary contraction(MVC) of both trained and untrained limb, were computed as Root Mean Square(RMS), mean power frequency(MPF) and integrated electromyography (IEMG) data in pre and post test.
Results: The result indicated a significant increase in elbow flexor MVC and time to failure in submaximal isometric task in trained and contralateral untrained limb. There was a significant difference between groups in RMS and MPF of biceps brachii in trained and untrained limb. However, this differences were not significant for brachialis and triceps in contralateral limbs. Also, after resistance training, there is a significant difference in the IEMG ratio of the muscles among blocks of submaximal contraction in trained and untrained limb, indicating a tendency to alternation in synergistic muscles activity.
Conclusions: Cross transfer effect of unilateral resistance training on time to task failure might be explained, at least partly by the mechanism of synergistic alternate activity pattern.

کلیدواژه‌ها [English]

  • Muscle Endurance
  • Cross-Transfer Effect
  • Unilateral Training
  • synergistic pattern
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