بررسی تأثیر تمرین مقاومتی درونگرا و برونگرا بر روی سرعت هدایت پتانسیل عمل تارهای عضلانی عضله چهار سر ران

نوع مقاله : مقاله پژوهشی Released under CC BY 4.0 license I Open Access I

نویسندگان

1 1. کارشناس ارشد فیزیولوژی ورزش، گروه علوم ورزشی، واحد بجنورد، دانشگاه آزاد اسلامی، بجنورد، ایران.

2 2. استادیار فیزیولوژی ورزش، گروه علوم ورزشی، واحد بجنورد، دانشگاه آزاد اسلامی، بجنورد، ایران.

10.22049/jahssp.2021.27528.1408

چکیده

هدف: هدف از پژوهش حاضر بررسی تأثیر 8 هفته تمرین مقاومتی درونگرا و برونگرا روی سرعت هدایت پتانسیل عمل تارهای عضلانی عضله چهار سر ران بود. روش شناسی: 30 نفر از پسر غیرفعال (سن: 1/2±3/22 سال؛ وزن:6/8±3/71 کیلوگرم و قد: 1/0±76/1 متر) برای این پژوهش انتخاب شدند. آزمودنی­ ها به­ صورت تصادفی به دو گروه تمرین درونگرا (15 نفر) و تمرین برونگرا (15 نفر) تقسیم شدند. حداکثر انقباض ارادی (MVC) و سیگنال­ الکترومیوگرافی سطحی قبل و بعد از هشت هفته تمرین برونگرا و درونگرا با شدت 80 درصد یک تکرار بیشینه، از عضله چهار سر ران ثبت گردید. برای تجزیه تحلیل داده­ ها از تجزیه تحلیل واریانس چند طرفه و آزمون تعقیبی توکی استفاده شد. یافته‌ها: نتایج تحقیق نشان داد که MVC اکستنشن زانو بعد از هشت هفته تمرینات مقاومتی درونگرا و مقاومتی برونگرا به ­طور معناداری افزایش یافت (001/0=P). همچنین میزان افزایش در فرکانس توان میانه و سرعت هدایت پتانسیل عمل تارهای عضلانی بعد از هشت هفته تمرینات مقاومتی برونگرا به طور معناداری بزرگتر از میزان افزایش آن بعد از تمرینات مقاومتی درونگرا بود (05/0˂P). نتیجه‌گیری: در مجموع افزایش بزرگتر در حداکثر انقباض ارادی اکستنشن زانو همراه با افزایش در فرکانس توان میانه و سرعت هدایت پتانسیل عمل تارهای عضلانی بعد از تمرینات مقاومتی برونگرا، بیانگر سازگاری بهتر و فراخوانی بیشتر تارهای عضلانی تند انقباض در اثر تمرینات مقاومتی برونگرا می­ باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigating the Effects of Eccentric and Concentric Resistance Training on Action Potential Conduction Velocity of Quadriceps Muscle Fibers

نویسندگان [English]

  • reza Akbari 1
  • Ali Yaghoubi 2
1 1. Master of Sports Physiology, Department of Sport Science, Bojnourd Branch, Islamic Azad University, Bojnourd, Iran
2 2. Assistant Professor of Sports Physiology, Department of Sport Science, Bojnourd Branch, Islamic Azad University, Bojnourd, Iran
چکیده [English]

Aim: The purpose of present study was investigating the effects of 8 weeks eccentric and concentric resistance training on Action potential conduction velocity of quadriceps muscle fibers. Methods: 30 male inactive subjects (age: 22.3±2.1 years; weight 71.3±8.6 kg and height: 1.76±0.1 m) were recruited for this controlled laboratory study. Subjects were randomly divided into two groups: the eccentric training group (No=15) and the concentric training group (No=15).  The maximal voluntary contraction (MVC) of quadriceps muscles and surface electromyography signals were recorded before and after 8 weeks of resistance concentric and eccentric training with 80% of 1RM. The multifactorial variance and Tukey Post hoc tests were used for data analysis.  Results: The results showed that MVC of knee extension after eccentric resistance training and concentric resistance training significantly increased (P=0.001). Also the increase in the mean power frequency and Action potential conduction velocity of muscle fibers after eccentric resistance training was significantly more than the increase after concentric resistance training (P<0.05). Conclusions: The higher increase in maximum voluntary contraction of knee extension is associated with increasing the frequency of moderate strength and Action potential conduction velocity of muscle fibers after eccentric resistance training indicates better adaptation and recruitment of fast-twitch muscle fibers to eccentric resistance training.

کلیدواژه‌ها [English]

  • eccentric training
  • concentric training
  • Action potential conduction velocity
  • Maximum voluntary contraction
  1.  

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