نوع مقاله : مقاله پژوهشی Released under CC BY-NC 4.0 license I Open Access I

نویسندگان

1 استادیار گروه فیزیولوژی ورزشی، دانشکدۀ علوم تربیتی و روانشناسی، بخش علوم ورزشی، دانشگاه شیراز، شیراز،

2 . استاد تمام گروه فیزیولوژی ورزشی، دانشکدۀ تربیت بدنی و علوم ورزشی، دانشگاه تهران، تهران، ایران

3 .دانشیار گروه فیزیولوژی ورزشی، دانشکدۀ تربیت بدنی و علوم ورزشی، دانشگاه تهران، تهران، ایران

4 استادیار علوم اعصاب، مرکز تحقیقات سلولی مولکولی، دانشگاه علوم پزشکی و خدمات بهداشتی درمانی ایران، تهران، ایران

چکیده

هدف از پژوهش حاضر، بررسی تأثیر شدت تمرین ورزشی بر ظرفیت نوزایی قلبی در رت‌های مبتلا به آنفارکتوس میوکارد (MI) بود. به این منظور، ابتدا رت‌های نر نژاد ویستار تحت عمل جراحی بستن شریان کرونری LAD قرار گرفتند و سپس از طریق اکوکاردیوگرافی ایجاد MI تأیید شد. چهار هفته پس از جراحی، رت‌های مبتلا به MI به‌صورت تصادفی در گروه‌های تمرین ورزشی با شدت‌های کم (LIT)، متوسط (MIT)، بالا (HIT) و شم (Sham) به اضافۀ گروه کنترل سالم (Con) قرار گرفتند و پروتکل‌های تمرین ورزشی را به مدت 6 هفته و 5 جلسه در هفته اجرا کردند. پس از اتمام مداخلۀ تمرین ورزشی رت‌ها تشریح شده و داده‌های حاصل از طریق آزمون ANOVA یکطرفه و آزمون LSD تجزیه‌وتحلیل شدند. نتایج نشان داد بین گروه‌ها در مقادیر کسر تزریقی، کسر کوتاه‌شدگی، mRNA Gata4 و mRNA Tbx5 تفاوت معناداری وجود دارد (001/0P=). نتایج آزمون تعقیبی نشان داد در هر سه گروه تمرین ورزشی مقادیر کسر تزریقی و کسر کوتاه‌شدگی نسبت به گروه Sham افزایش معناداری داشته‌اند، اما با وجود این افزایش، مقادیر آنها در گروه Con به شکل معناداری بیشتر از گروه‌های مبتلا به MI بود. همچنین در مقادیر mRNA Gata4 گروه LIT نسبت به گروه‌های MIT، HIT، Sham و Con افزایش معناداری مشاهده شد. با وجود این، در مقادیر mRNA Tbx5 بین گروه‌های مبتلا به MI تغییرات معناداری مشاهده نشد و تنها مقادیر mRNA Tbx5 در گروه Con نسبت به گروه‌های مبتلا به MI به‌صورت معناداری بیشتر است. در نتیجه، تمرین ورزشی صرف‌نظر از شدت، عملکرد قلبی رت‌های مبتلا به MI را افزایش می‌دهد، اما به‌نظر می‌رسد تمرین ورزشی با شدت کم، عامل مؤثرتری در افزایش ظرفیت نوزایی قلبی رت‌های مبتلا به MI باشد.

کلیدواژه‌ها

عنوان مقاله [English]

The Effect of Exercise Training Intensity on Cardiac Regeneration Capacity in Rats with Myocardial Infarction

نویسندگان [English]

  • Mohammad ali Hemati Nafar 1
  • Abbasali Gaeini 2
  • Abbas Ali Gaeini 3
  • Siroos Choobineh 3
  • Fariba Karimzade 4

1 Assistant Professor of Exercise Physiology, Faculty of Educational Sciences and Psychology, Department of Sport Sciences, Shiraz University, Shiraz, Iran

2 Professor, Department of Exercise Physiology, Faculty of Physical Education and Sport Sciences, University of Tehran, Tehran, Iran

3 Associate Professor, Department of Exercise Physiology, Faculty of Physical Education and Sport Sciences, University of Tehran, Tehran, Iran

4 Assistant Professor of Neuroscience, Cellular and Molecular Research Center, Iran University of Medical Sciences, Tehran, Iran

چکیده [English]

The aim of this study was to investigate the effect of exercise training intensity on cardiac regeneration capacity in rats with myocardial infarction (MI). Male wistar rats were exposed to LAD coronary artery ligation surgery and then the creation of MI was confirmed by echocardiography. Four weeks after surgery, the rats with MI were randomly assigned to these groups: low intensity training (LIT), moderate intensity training (MIT), high intensity training (HIT), and Sham, plus a healthy control group (Con). Training groups performed the exercise training protocols for 6 weeks, 5 sessions per week. The rats were sacrificed after the exercise training intervention, and the obtained data were analyzed by one-way ANOVA and LSD test. The results showed a significant difference in the values of ejection fraction, fractional shortening, mRNA Gata4, and mRNA Tbx5 among all groups (P=0.001). LSD test results demonstrated that ejection fraction and fractional shortening values increased significantly in all three exercise training groups compared with the sham group. However, contrary to this increase, their values in the Con group was significantly higher than the groups with MI. Results also showed that mRNA Gata4 value significantly increased in the LIT group compared with the MIT, HIT, Sham, and Con groups. However, mRNA Tbx5 values showed no significant changes among the groups with MI. Only mRNA Tbx5 values in Con group were significantly higher compared with the groups with MI. In conclusion, regardless the intensity, exercise training increases cardiovascular function in rats with MI. However, it seems that low intensity exercise is a more effective agent in increasing cardiac regeneration capacity in rats with MI. 
 

کلیدواژه‌ها [English]

  • Cardiac function
  • cardiac regeneration capacity
  • exercise training intensity
  • myocardial infarction
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