نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری فیزیولوژی ورزشی، دانشکده علوم ورزشی و تندرستی، دانشگاه شهید بهشتی، تهران، ایران.
2 استاد گروه فیزیولوژی ورزشی، دانشکده علوم ورزشی و تندرستی، دانشگاه شهید بهشتی، تهران، ایران.
3 استادیار گروه فیزیولوژی ورزشی، دانشکده علوم ورزشی و تندرستی، دانشگاه شهید بهشتی، تهران، ایران.
4 استاد گروه گردش خون و تصویربرداری پزشکی، دانشکده پزشکی و علوم بهداشت، دانشگاه علم و صنعت نروژ (NTNU)، تروندهایم، نروژ
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Background and Aim: In aging, cardiac conduction disorders and arrhythmias are among the main causes of mortality in these individuals. The aim of this study was to investigate the effect of different acute exercises on the expression of genes responsible for cardiac conduction in elderly rats. Materials and Methods: Twenty-four old male Wister rats (23 months, weigh 465±45 g) recruited and divided into four groups (each group consist of six elderly rats), control group , moderate intensity continuous exercise (MICE), high intensity interval exercise-low volume (HIIE-LV), and high intensity interval exercise-high volume (HIIE-HV). After exercise, all rats were anesthetized and sacrificed then SA and AV node tissue was used to examine the expression of GATA transcription factor 4 (GATA4), protein kinase B (AKT), myocyte promoter factor C2 (MEF2C), and T-box transcription factor 5 (Tbx5). Real-time PCR was used to examine the expression of these genes. In order to analysis of data, One-way ANOVA and Tukey post hoc tests were used. Results: Analysis of our data showed that in the SA and AV nodes the expression of AKT1 (p= 0.001 and p= 0.001, respectively), GATA4 (p= 0.001 and p= 0.001, respectively), MEF2C (p= 0.01 and p= 0.001, respectively) and Tbx5 (p= 0.001 and p= 0.001, respectively) genes increased significantly after HIIE-HV compared to control group. Although, in SA node the expression of AKT1 (p= 0.01), GATA4 (p= 0.005) and Tbx5 (p = 0.009) genes increased significantly after HIIE-LV compared to control group, While the expression of AKT1 (p = 0.43), GATA4 (p= 0.21), Tbx5 (p= 0.19) and MEF2C (p= 0.44) genes in the AV node did not change significantly. Also, in response to MICE, the expression of AKT1 (p= 0.29 and p= 0.11, respectively), GATA4 (p= 0.15 and p= 0.72, respectively), MEF2C (p= 0.31 and p= 0.85, respectively) and Tbx5 (p= 0.98 and p= 0.84, respectively) genes in the SA and AV nodes did not change significantly. Conclusion: HIIE-LV and HIIE-HV compared to MICE can significantly increase the expression of genes related to cardiac conduction in elderly rats, which can improve the function of the cardiac electrical conduction system, improve arrhythmias, and reduce mortality in elderly individuals.
کلیدواژهها [English]