1استادیار فیریولوژی ورزشی دانشگاه ملایر،گروه تربیت بدنی، ملایر،ایران
2دانشگاه تربیت دبیر شهید رجایی
3دانشگاه تهران
4استاد مدعو دانشگاه زنجان
تاریخ دریافت: 30 خرداد 1396،
تاریخ بازنگری: 23 تیر 1396،
تاریخ پذیرش: 19 مهر 1396
چکیده
مقدمه: این مطالعه با هدف بررسی تاثیر هشت هفته تمرین تناوبی بر بیان ژن کانال‌های کلسیمی گیرنده های رایانودین و پمپ کلسیمی در موشهای صحرایی ایسکمی شده صورت گرفت. مواد و روش ها: در این مطالعه 28 موش صحرایی نر ویستار (250-200 گرم) به صورت تصادفی در 4 گروه شم، ایسکمی، تمرین و تمرین- ایسکمی مورد استفاده قرار گرفتند. انفارکتوس میوکارد (MI) با بستن شریان کرونری نزولی (LAD) به مدت 30 دقیقه انجام شد. برنامه تمرینی روی تریدمیل به مدت 8 هفته، 3 روز در هفته به مدت 40 دقیقه بود. 48 ساعت پس از آخرین جلسه تمرینی و تزریقات، موشها بی هوش شده و بافت قلب جدا شد. و بیان ژن SERCA2a و RyR2 برای سلولهای بافت قلب اندازه گیری شد. یافته ها: نتایج نشان داد که سطح بیان ژن SERCA2a در هر دو گروه تمرین و تمرین- ایسکمی افزایش (001/0=p) و این افزایش بطور معناداری درگروه تمرین- ایسکمی بیشتر بود(001/0=p). همچنین نتایج نشان داد که 8 هفته تمرین اینتروال موجب افزایش معنادار سطح بیان ژن RyR2 در دو گروه تمرین- ایسکمی و تمرین شد. اما در گروه ایسکمی کاهش معناداری در سطح بیان ژن RyR2 مشاهده شد. بحث و نتیجه گیری: نتایج این مطالعه نشان می دهد که یک برنامه منظم تمرینی تناوبی، انقباضات غیرطبیعی همراه با کاردیومیوپاتی ناشی از ایسکمی میوکارد را از بین می برد و کنترل کلسیم عضله قلبی را ترمیم می کند و قدرت انقباض به طور عمده توسط افزایش جرم بطن چپ افزایش می یابد.
The effect of eight weeks of interval training on gene expression of Ryanodine receptors' (RyR2) calcium channels and calcium pump SERCA2a in ischemic rats
نویسندگان [English]
Akbar Sazvar1؛ YAGHOOB MEHRIALVAR2؛
چکیده [English]
Introduction: This study aimed to investigate the effect of eight weeks of interval training on gene expression of Ryanodine receptors' calcium channels and calcium pump in ischemic rats. Methodology: 28 Wistar male rats (200-250 g) were used in this study. They were randomly divided into 4 groups: Sham, Ischemia, Exercise, and Exercise-ischemia. Myocardial infarction (MI) was done by closing the descending coronary artery (LAD) for 30 minutes. Exercise program on treadmill was for 8 weeks, 3 days a week for 40 minutes. The rats were anesthetized and the heart tissue was isolated 48 hours after the last training session and injections. SERCA2a and RyR2 gene expression was measured for heart tissue cells. Results: The results showed that SERCA2a gene expression level was increased in both groups of exercise and exercise-ischemia (p= 0.001) and this increase was significantly higher in exercise-ischemia group (p = 0.001). Also, the results showed that 8 weeks of interval training significantly increased RyR2 gene expression level in two groups of exercise- ischemia and exercise. But a significant decrease was observed in RyR2 gene expression level in ischemia group. Discussion and Conclusion: This study results show that a regular interval training program eliminates abnormal contractions associated with cardiomyopathy due to myocardial ischemia and rehabilitates cardiac muscle calcium control and increases mainly the contraction strength by the increase of left ventricle mass.
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