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

نویسندگان

1 دانشیار، دانشکدۀ تربیت بدنی و علوم ورزشی دانشگاه تهران، تهران، ایران

2 کارشناس ارشد تربیت بدنی، دانشکدۀ تربیت بدنی و علوم ورزشی دانشگاه تهران، تهران، ایران

3 دکتری فیزیولوژی ورزش، دانشکدۀ علوم تربیتی و روانشناسی، دانشگاه محقق اردبیلی، اردبیل، ایران

چکیده

هدف از پژوهش حاضر مقایسۀ پاسخ‌های تستوسترون، کورتیزول و کراتین‌کیناز به دو نوع تمرین مقاومتی با و بدون محدودیت جریان خـون بـود. بـه این منظور 36 پسر ژیمناستیک‌کار 10 تا 14 ساله در یک طرح تحقیق نیمه‌تجربی شرکت کردند. آزمودنی‌ها با میانگین وزن 11/8±11/37 کیلوگرم، قد 58/11±16/145 سانتی‌متر، شاخص تودۀ بدن 77/1±40/17 کیلوگرم بر مترمربع به‌طور تصادفی به سه گروه کنترل (12n=)، تمرین مقاومتی سنتی (12n=) و تمرین مقاومتی همراه با محدودیت جریان خون (12n=)، تقسیم شدند. تمرین شامل سه حرکت باز شدن زانو، خم شدن آرنج و پرس سینه بود. نمونه‌های خونی قبل و نیم ساعت بعد از اجرای تمرین گرفته شد. از آزمون آماری تی وابسته برای بررسی نتایج درون‌گروهی و از آنالیز واریانس یکراهه با آزمون تعقیبی LSD برای بررسی نتایج بین‌گروهی استفاده شد. نتایج درون‌گروهی نشان داد که پس از یک وهله فعالیت ورزشی متغیر تستوسترون در هیچ‌یک از گروه‌های قدرتی (653/0P=) و انسدادی (107/0P=) معنا‌دار نشد، لیکن متغیر کورتیزول در هر دو گروه قدرتی (015/0P=) و انسدادی (015/0P=) افزایش معنا‌دار داشت. همچنین کراتین‌کیناز تنها در گروه قدرتی (001/0P=) معنا‌دار شد. نتایج بین‌گروهی نشان داد در هر دو نوع تمرین در مقادیر تستوسترون و کورتیزول تفاوت معنا‌داری بین گروه‌ها وجود نداشت؛ اما در متغیر کراتین‌کیناز تفاوت معنا‌دار بود (05/0P=). این مطالعه با پاسخ آنابولیک برابر در دو نوع تمرین و شاخص آسیب کمتر در گروه تمرین مقاومتی با محدودیت جریان خون تا حدودی از سودمندی این نوع از تمرین مقاومتی حمایت می‌کند.

کلیدواژه‌ها

عنوان مقاله [English]

A Comparison of the Responses of Testosterone, Cortisol and Creatine Kinase to Two Types of Resistance Training with and without Blood Flow Restriction in Gymnast Boys

نویسندگان [English]

  • Ali Akbarnejad 1
  • Sirous Choobineh 1
  • Morteza Yari 2
  • Ali Rajabi 3

1 Associate Professor, Faculty of Physical Education and Sport Sciences, University of Tehran, Tehran, Iran

2 . MSc of Physical Education, Faculty of Physical Education and Sport Sciences, University of Tehran, Tehran, Iran

3 Ph.D. of Exercise Physiology, Faculty of Educational Sciences and Psychology, Mohaghegh Ardabili University, Ardabil, Iran

چکیده [English]

The aim of this study was to compare the responses of testosterone, cortisol and creatine kinase to two types of resistance training with and without blood flow restriction. For this purpose, 36 gymnast boys aged between 10 and 14 participated in a quasi-experimental research. The subjects (mean weight 37.11 ± 8.11 kg, height 145.16 ± 11.58 cm, body mass index 17.40 ± 1.77 kg/m2) were randomly divided into three groups: control (n=12), traditional resistance training (n=12), and resistance training with blood flow restriction (n=12). Training protocol included three movements: leg extension, elbow flexion and bench press. Blood samples were collected before and half an hour after the training. Dependent t test was used to check the intragroup results and one-way ANOVA and LSD post hoc test were used to evaluate the intergroup results. The intragroup results showed that testosterone variable was not significant in traditional resistance training (P=0.653) and resistance training with blood flow restriction (P=0.107) groups after a bout of training. But cortisol variable significantly increased in both traditional resistance training (P=0.015) and resistance training with blood flow restriction (P=0.015) groups. Also, creatine kinase was significant only in traditional resistance training group (P=0.001). The intergroup results showed that no significant differences in testosterone and cortisol of both types of training between the groups but the difference was significant in creatine kinase (P=0.05). Equal anabolic response in two types of resistance training in this study and less damage index in blood flow restriction group supported the advantage of this type of resistance training to some extent.

کلیدواژه‌ها [English]

  • blood flow restriction
  • cortisol
  • creatine kinase
  • gymnast boys
  • testosterone
  • traditional resistance training
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