نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری فیزیولوژی ورزشی، گروه فیزیولوژی ورزشی، دانشکده تربیت بدنی و علوم ورزشی، دانشگاه گیلان، رشت، ایران.
2 استاد گروه فیزیولوژی ورزشی، دانشکده تربیت بدنی و علوم ورزشی، دانشگاه گیلان، رشت، ایران.
چکیده
زمینه و هدف: بخوبی مشخص شده است که عامل نسخه برداری A میتوکندری (TFAM) و عامل تنفسی هسته ای-1 (NRF-1) تنطیم کننده های کلیدی بایوژنز میتوکندری و فسفوریلاسیون اکسیداتیو هستند. این مطالعه اثر 12 هفته تمرینات تناوبی با شدت بالا (HIIT) و متوسط (MIIT) را بر مولکول های تنظیمی بایوژنز میتوکندری (TFAM و NRF-1) عضله اسکلتی رت های نر دیابتی نوع دو بررسی کرد. روش تحقیق: تعداد 40 سر رت نر (سن: 8 هفته، وزن: 20±180 گرم) به دو گروه رژیم غذای پر چرب (HFD) شامل 32 سر و رژیم غذای استاندارد (C) شامل 8 سر تقسیم شدند. پس از القاء دیابت نوع دو از طریق استروپتوزوتوسین در رت های چاق، 8 سر رت دیابتی (D) و 8 سر رت گروه C کشته شدند و 24 سر رت باقیمانده به طور تصادفی به سه گروه کنترل دیابتی (DC)، گروهMIIT ، و گروه HIIT تقسیم گردیدند. برنامه MIIT شامل 13 وهله فعالیت 4 دقیقه‌ای با شدت 70-65 درصد VO2max و برنامه HIIT شامل اجرای 10 وهله فعالیت 4 دقیقه‌ای با شدت 90-85 درصد VO2max با دوره‌های استراحتی فعال دو دقیقه‌ای بودند که به مدت 12 هفته با تکرار 5 جلسه در هفته، به اجرا در آمدند. از روش وسترن بلات برای اندازه گیری مقادیر پروتئین های TFAM و NRF1 و از آزمون های پارامتریک و ناپارامتریک برای تحلیل داده ها در سطح معنی داری 05/0≥p استفاده شد. یافته‌ها: سطوح پروتئینی TFAM و NRF1 پس از القاء دیابت نسبت به گروه C به طور معنی داری کاهش یافت (01/0>p). هر دو برنامه HIIT و MIIT منجر به افزایش غیر معنی دار سطوح پروتئینی NRF-1 نسبت به گروه DC شدند (05/0<p)؛ ضمن آن که HIIT بر TFAM اثر معنی داری نداشت (05/0<p). نتیجه‌گیری: به نظر می‌رسد برنامه های HIIT و MIIT منجر به بهبود تنفس میتوکندریایی می شوند، اما اثری بر بایوژنز میتوکندری ندارند؛ با این وجود بررسی های بیشتر در این زمینه ضروری است.
کلیدواژه‌ها
عنوان مقاله [English]
The effects of high and moderate intensity interval training on skeletal muscle of TFAM and NRF1 in type 2 diabetic male rats
نویسندگان [English]
- Elma Tabari 1
- Hamid Mohebbi 2
1 PhD Student of Exercise Physiology, Department of Exercise Physiology, Faculty of Physical Education and Sport Sciences, University of Guilan, Guilan, Iran.
2 Full Professor, Department of Exercise Physiology, Faculty of Physical Education and Sport Sciences, University of Guilan, Guilan, Iran.
چکیده [English]
Background and Aim: It is well recognized that mitochondrial transcription factor A (TFAM) and nuclear respiratory factor-1 (NRF-1) are the key regulators of mitochondrial biogenesis and oxidative phosphorylation. This study investigated whether 12 weeks of interval training with high (HIIT) and moderate (MIIT) intensity influences the key regulatory molecules of mitochondrial biogenesis (TFAM and NRF-1( of skeletal muscle in type 2 diabetic male rats. Materials and Methods: Forty male rats (age: 8 weeks, weight: 180±20 g) were divided into two groups: high fat diet (HFD) including 32 rats, and standard diet (C) including 8 rats. After inducing type 2 diabetes via Streptozotocin, 8 diabetic rats (D) and 8 rats in group C were sacrificed and the remaining 24 rats were randomly assigned to three groups including diabetic control (DC), MIIT, and HIIT. The MIIT protocol includes 13 bouts of 4-minute activity with an equivalent intensity of 60-65% VO2max and the HIIT protocol includes 10 bouts of 4-minute activity with the equivalent intensity of 85-90% VO2max with 2 minute active rest periods that was performed for 12 weeks, and 5 sessions per week. Western blotting was used to measure the levels of TFAM and NRF1 proteins; and the parametric and non-parametric tests were used to analyze the data at the p≤0.05 level. Results: The results showed that TFAM and RNF-1 protein levels were significantly decreased in the D group compared to the C group (p<0.01). Indeed, exercise training resulted in an insignificant increase in protein levels of NRF-1 compared to the DC group (p>0.05); while HIIT and MIIT had no significant effect on protein levels of TFAM (p>0.05). Conclusion: It seems that the HIIT and MIIT programs improve mitochondrial respiration but have no effect on mitochondrial biogenesis in type 2 diabetic rats. However, further research is needed for definite results.
کلیدواژه‌ها [English]
- Type 2 diabetes
- Intensity of exercise training
- Mitochondrial biogenesis
- Mitochondrial respiration
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