نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار فیزیولوژی ورزشی، دانشگاه شهید بهشتی

2 دانشجوی دکتری فیزیولوژی ورزشی، دانشگاه شهید بهشتی

3 دانشیار مرکز تحقیقات علوم اعصاب دانشگاه علوم پزشکی، دانشگاه شهید بهشتی

چکیده

هدف از انجام این تحقیق بررسی تأثیر یک جلسه فعالیت تداومی و تناوبی با شدت بالا بر سطوح HIF-1α و TNF-α در بافت چربی موش­های چاق نر ویستار بود. آزمودنی­ها شامل 30 سر موش 16 هفته­ای چاق بود که به مدت هشت هفته از رژیم پر­چرب استفاده کرده بودند. آزمون وامانده­ساز پیش­بین حداکثر اکسیژن مصرفی برای تعیین شدت فعالیت انجام شد. سپس حیوانات به گروه­های کنترل، فعالیت تداومی و HIIE تقسیم شدند. فعالیت HIIE شامل پنج وهله دو دقیقه­ای با شدت vVO2max100% که به وسیله چهار وهله دو دقیقه­ای با شدت vVO2max30% از هم جدا شده بودند. فعالیت تداومی شامل دویدن با شدت vVO2max65% بود و زمان دویدن بر اساس میزان جا­به­جایی در گروه تناوبی با شدت بالا محاسبه شد. مقادیر پروتئین توسط روش وسترن بلات در بافت چربی احشایی و زیر­پوستی اندازه­گیری و تحلیل داده­ها با نرم افزار SPSS انجام شد. میزان پروتئین HIF-1α در چربی احشایی گروه تداومی نسبت به کنترل، 5/33% و در گروه HIIE 45% کاهش معنی­دار داشت (P<0.001). همچنین میزان پروتئین TNF-α در هردو گروه تجربی نسبت به کنترل کاهش داشت و کاهش در گروه تداومی نسبت به HIIE به طور معنی­دار بیشتر بود (P<0.001). با توجه به نتایج می­توان گفت فعالیت ورزشی، به ویژه HIIE که انجام آن برای افراد چاق سخت یا خطرناک به نظر می­آید، احتمالاً منجر به افزایش هایپوکسی و التهاب بافت چربی نشده و احتمال افزایش التهاب سیستمی و مشکلات به دنبال آن را در یک جلسه فعالیت ورزشی شدید رد می­کند.

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