نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری فیزیولوژی ورزشی، دانشگاه شهرکرد، شهرکرد، ایران
2 دانشیار فیزیولوژی ورزشی، دانشگاه شهرکرد، شهرکرد، ایران
3 استاد علوم درمانگاهی، دانشگاه شهرکرد، شهرکرد، ایران
چکیده
هدف از انجام مطالعة حاضر، تأثیر شدتهای مختلف تمرین مقاومتی و استقامتی بر بیان microRNA-133a (mir-133a)، RUNX2 و گیرندة فعالکنندة تکثیر پروکسی زوم گاما (PPARγ) در مغز اسـتخوان موشهای صحرایی نر سالمند نژاد ویستار بود. 40 سر موش صحرایی نر سالمند (میانگین سنی: 23 ماه، میانگین وزن: 27/438 گرم) نژاد ویستار به پنج گروه مساوی هشتتایی شامل تمرینهای مقاومتی و استقامتی با شدت متوسط و شدید و گروه کنترل بهطور تصادفی تقسیم شدند. تمرینهای مقاومتی متوسط و شدید بهترتیب با شدت 60 درصد و 80 درصد حداکثر ظرفیت حمل ارادی با استفاده از نردبان مقاومتی، تمرین استقامتی با شدت متوسط 70-60 درصد سرعت بیشینه و تمرین استقامتی با شدت شدید 110-80 درصد سرعت بیشینه، با استفاده از تردمیل جوندگان انجام شدند و هر دو نوع تمرین پنج روز در هفته بهمدت هشتهفته انجام شدند. بعد از پایان دورة تمرین، بیان mir-133a ، RUNX2 و PPARγ در بافت مغز استخوان تیبیا به روش RT–PCR اندازهگیری شد. تجزیهوتحلیل آماری با استفاده از آزمون کروسکال والیس در سطحP ≤ 0.05 انجام شد. این پژوهش نشان داد که میزان بیان mir-133a0.197) = P)، Runx2 (0.960 =P ) و PPARγ0.872) = P) در گروههای تمرینی با شدت بالا و متوسط در مقایسه با گروه کنترل تفاوت معناداری نداشت؛ بنابراین، بهنظر میرسد که تغییرات سلولی متابولیسم استخوان پس از انجام چنین تمرینهایی به دورههای طولانیتر تمرین ورزشی یا اندازهگیریهای دیگری بهویژه در سطح پروتئومیکس نیاز دارد که باید در پژوهشهای آینده بررسی شود.
کلیدواژهها
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