نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری فیزیولوژی ورزشی، دانشکده تربیتبدنی و علوم ورزشی، دانشگاه گیلان، رشت، ایران.
2 استاد گروه فیزیولوژی ورزشی، دانشکده تربیتبدنی و علوم ورزشی، دانشگاه گیلان، رشت، ایران.
چکیده
زمینه و هدف: کراتین هیدروکلراید به عنوان فرم جدید کراتین و به دلیل خواص هیدروکلرایدی، دارای جذب و حلالیت بالاتر و قدرت تاثیرگذاری بیشتری بر عملکرد میباشد. هدف پژوهش حاضر، بررسی اثر مکملیاری کراتین هیدروکلراید همراه با تمرین مقاومتی، بر میزان تستوسترون، کورتیزول، قدرت، هایپرتروفی عضلانی و ترکیببدن مردان جوان بود. روش تحقیق: تعداد 20 مرد جوان در این پژوهش شرکت کردند. شرکتکنندگان به دو گروه (10 نفری) شامل تمرین مقاومتی همراه با کراتین هیدروکلراید (03/0 گرم به ازای هر کیلوگرم وزن بدن در روز، مصرف 30 دقیقه قبل از تمرین) و گروه تمرین مقاومتی همراه با دارونما (با دوز و زمان مشابه مصرف) تقسیم شدند و به مدت هشت هفته تحت مداخله مکملیاری کراتینهیدروکلراید و تمرین مقاومتی (هر هفته سه جلسه، با شدت 85-70 درصد یک تکرار بیشینه، سه نوبت با 12-6 تکرار) قرار گرفتند. قبل و بعد از مداخله، قد، وزن، ترکیببدن (توده عضلانی، درصد چربی و هایپرتروفی عضلانی)، قدرت عضلانی (در حرکت پرس سینه و پرس پا) و سطوح سرمی تستوسترون و کورتیزول با روشهای معتبر اندازهگیری شد. سپس نتایج با آزمون تحلیل کوواریانس در سطح معنیداری 05/0≥p استخراج گردید. یافتهها: کراتین هیدروکلراید همراه با تمرین مقاومتی، باعث افزایش معنیدار بیشتری در نسبت تستوسترون به کورتیزول، قدرت عضلانی پرس سینه و پرس پا، سطح مقطع عضلانی بازو و ران، توده عضلانی بدن؛ و کاهش معنیدار بیشتری در درصد چربی و کورتیزول شرکت کنندگان، نسبت به تمرین مقاومتی همراه با دارونما شد. نتیجهگیری: نتایج نشاندهنده اثرگذاری کراتین هیدروکلراید بر سطوح کورتیزول، نسبت تستوسترون به کورتیزول، قدرت عضلانی پرس سینه و پرس پا و سطح مقطع عضلانی بازو و ران میباشد و به نظر میرسد این نوع از کراتین، با توجه ویژگیهایی که دارد، بدون نیاز به دوره بارگیری، بتواند اثرات مفید بهتری بر عملکرد و نیمرخ هورمونی داشته باشد.
کلیدواژهها
عنوان مقاله [English]
Can creatine hydrochloride combined with resistance training affect testosterone and cortisol levels, strength, muscle hypertrophy and body composition in young men?
نویسندگان [English]
- Ehsan Eghbali 1
- Hamid Arazi 2
1 Ph.D. Student of Exercise Physiology, Faculty of Physical Education and Sport Sciences, University of Guilan, Rasht, Iran.
2 Professors of Department of Exercise Physiology, Faculty of Physical Education and Sport Sciences, University of Guilan, Rasht, Iran
چکیده [English]
Background and Aim: Creatine hydrochloride is a new form of creatine, it has higher absorption and solubility and also a greater impact on performance due to the properties of hydrochloride. The purpose of this study was to investigate the effect of creatine hydrochloride supplementation along with resistance training on testosterone, cortisol, strength, muscle hypertrophy and body composition in young men. Materials and Methods: Twenty qualified young men participated in this research. They were divided into two groups (10 people) including resistance training with creatine hydrochloride (0.03 grams per kilogram of body weight per day, taken 30 minutes before training) and resistance training with placebo (with the same dose and time of use). The creatine hydrochloride consumption and resistance training (three sessions per week, with an intensity of 70-85% of one maximum repetition, three times with 6-12 repetitions) interventions were applied for eight weeks. Before and after the intervention, height, weight, body composition (muscle mass, fat percentage and muscle hypertrophy), muscle strength (in chest press and leg press) and serum levels of testosterone and cortisol were measured based on standard valid methods. For statistical analsysis, the results were extracted with the covariance test at a significance level of p≤0.05. Results: Creatine hydrochloride along with resistance training caused a more significant increase in the ratio of testosterone to cortisol, muscle strength of chest press and leg press; cross-sectional area of arm and thigh muscles; and muscle mass; but it also showed a more significant decrease in the percentage of fat and cortisol of the participants, compared to resistance training with placebo. Conclusion: The results show the efficiency of creatine hydrochloride on some variables as: cortisol, the ratio of testosterone to cortisol, the muscle strength of chest press and leg press, and the cross-sectional area of the arm and thigh muscles, and it seems that this type of creatine, considering its characteristics, does not require a loading period, can have beneficial effects on performance and hormonal profile.
کلیدواژهها [English]
- Creatine hydrochloride
- Resistance training
- Hormonal adaptation
- Muscle mass
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