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

نویسندگان

1 نویسندۀ مسئول، گروه فیزیولوژی ورزشی، دانشکدۀ علوم انسانی، دانشگاه کردستان، سنندج، ایران.

2 گروه فیزیولوژی ورزشی، دانشکدۀ علوم انسانی، دانشگاه کردستان، سنندج، ایران.

چکیده

مقدمه: هدف از این تحقیق، بررسی تأثیر زمان مصرف مکمل اسید آمینۀ شاخه‌‌دار بر تغییر غلظت هورمون‌های آنابولیک-کاتابولیک و آسیب عضلانی در افراد تمرین‌کرده به‌‌دنبال تمرین مقاومتی حاد بود.
روش پژوهش: در این پژوهش نیمه‌‌تجربی با طرح متقاطع، 11 ورزشکار فعال مرد از باشگاه‌‌های ورزشی سنندج با میانگین سنی 9/6±32 سال، قد 7/22±7/179 سانتی‌‌متر، وزن 11/1 ± 4/79 کیلوگرم و شاخص تودۀ بدنی 8/3±3/25 کیلوگرم بر مترمربع که حداقل سه جلسه تمرین منظم در طول هفته داشتند و هیچ سابقۀ مصرف مکملی نداشتند، به‌‌طور هدفمند انتخاب شدند و سپس به‌‌صورت تصادفی تحت چهار شرایط (دریافت مکمل/ دارونما 20 دقیقه قبل از تمرین و بلافاصله بعد از تمرین) قرار گرفتند. در اولین جلسه نیمی از افراد 3 گرم مکمل اسیدهای آمینه شاخه‌‌دار و نصف دیگر 20 دقیقه قبل از انجام تمرینات مقاومتی دارونما دریافت کردند. در جلسۀ دوم، جای آزمودنی‌‌ها تغییر کرد و جلسات سوم و چهارم با این تفاوت که زمان مصرف مکمل بلافاصله پس از اتمام تمرینات مقاومتی بود، برگزار شد. هر جلسه دو نمونه خون، پیش از شروع برنامۀ مقاومتی و دوباره نیم‌‌ساعت بعد از اتمام برنامه تمرینی برای اندازه‌‌گیری متغیرهای مورد بررسی گرفته شد.
یافته‌‌ها: آنالیز واریانس با اندازه‌‌گیری‌‌های مکرر نشان داد که مکمل اسید آمینۀ شاخه‌‌دار بر شاخص‌‌های آسیب عضلانی (کراتین کیناز و لاکتات دهیدروژناز) اثر معنا‌‌دار ندارد و غلظت سرمی هورمون‌‌های تستوسترون، کورتیزول و رشد را تغییر نمی‌‌دهد.
نتیجه‌‌گیری: به‎طور کلی، یافته‌‌های حاضر نشان می‌‌دهد که استفاده از یک دوز اسید آمینۀ شاخه‌‌دار پیش و پس از پایان پروتکل تمرین مقاومتی، بر تغییرات غلظت هورمون‌‌های آنابولیک - کاتابولیک و آسیب عضلانی تأثیر نمی‌‌گذارد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The Effect of Timing of BCAA Supplementation on Anabolic-Catabolic Hormones Concentration and Muscle Damage Following Acute Resistance Training

نویسندگان [English]

  • Azin Bababeygi Sanandaji 1
  • Darush Sheikholeslami vatani 2

1 Corresponding author, Department of Sports Physiology, Faculty of Humanities, University of Kurdistan, Sanandaj, Iran.

2 Department of Sports Physiology, Faculty of Human Sciences, University of Kurdistan, Sanandaj, Iran.

چکیده [English]

Introduction: This study aimed to investigate the effect of Branched-Chain Amino Acid (BCAA) supplementation time on changes in the concentration of anabolic-catabolic hormones and muscle damage in trained individuals following acute resistance training.
Methods: In this quasi-experimental study with cross-sectional design, 11 active male athletes from Sanandaj sports clubs with a mean age of 32±6.9 years, height of  179.7±22.7 Cm, weight of 79.4±1.11Kg, and body mass index of 25.3 ± 3.8 Kg/m2  who had at least three regular training sessions during the week and had no history of taking supplement, were selected purposefully and then randomly subjected to four conditions (taking supplement/placebo 20 minutes before training and immediately after training). In the first session, half of the participants received three grams of BCAA supplements, and the other half received a placebo 20 minutes before resistance training. In the second session, the participants were subjected to opposite conditions. The conditions in the third and fourth sessions were different in that the time of taking the supplement was immediately after the end of resistance training. In each session, two blood samples were drawn before the beginning of the resistance program and again half an hour after the end of the training program to measure the studied variables.
Results: Analysis of variance with repeated measurements showed that BCAA supplementation does not significantly affect muscle damage indices (creatine kinase and lactate dehydrogenase) and does not change the serum concentration of testosterone, cortisol, and growth hormones.  
Conclusion: In general, the present findings show that the use of one dose of BCAA before and after the end of the resistance training protocol does not affect the changes in the concentration of anabolic-catabolic hormones and muscle damage.

کلیدواژه‌ها [English]

  • BCAA Supplementation
  • Muscle Damage
  • Resistance Training
  • Supplementation Time

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