Showing 4 results for Hypertrophy
Z Keshavarzi, F Daryanoosh, M Kooshki Jahromi, M Mohammadi,
Volume 25, Issue 3 (6-2017)
Abstract
Introduction: Increased serum levels of FGF23 is associated with left ventricular hypertrophy. Increased serum ACE probably plays a role in cardiovascular disease and negatively affects the structure and function of cardiac muscle and leads to an induction of pathologic concentric hypertrophy. The aim of the present study was to investigate the effect of 12 weeks aerobic exercise on plasma FGF23, ACE and left ventricular hypertrophy in hypertensive elderly women.
Methods: In this study, 20 elderly women aged 50 to 70 years old were randomly chosen and and divided into two groups (control and aerobic exercise) based on body fat percentage and body mass index. Exercise program included increasingly aerobic exercise, performed 3 times a week for 12 weeks. Before starting the training and 24 hours after the last training session, blood samples were taken and cardiac echocardiography was conducted. Data were evaluated using t-test analysis at the significance level of P< 0.05.
Results: According to the results, the significant changes in left ventricular wall thickness (p=0/0001), and the level of ACE were observed between pre-test and post-test of the aerobic training group (p=0/0001); while there was no significant difference among FGF23 of the aerobic exercise and control groups.
Conclusion: The results of this study demonstrated that aerobic exercise has a positive effect on heart function and serum levels of ACE, and can potentially reverse cardiac dysfunction associated with left ventricular hypertrophy.
Mohammad Ali Gharaat, Majid Kashef, Behnamedin Jameie, Hamid Rajabi,
Volume 25, Issue 9 (12-2017)
Abstract
Introduction: Physiological hypertrophy following training manifests with cardiac mass changes. In addition, physical activities lead to Hand2 gene expression as an important gene in cardiac remodeling. The present study aimed to investigate the effects of endurance and high intensity interval Ttraining on Hand2 gene expression and cardiac changes.
Method: For this intent, 24 male rats (age 3 months; weight 229.30 ± 15.7 grams) divided randomly into the control (n=6), sham (n=6), interval (n=6) and endurance (n=6) groups. The endurance group swam for 12 weeks/5 days per week whereas swimming time increased incrementally. In addition, interval group swam 12 weeks/4 days per week while the load to body weight ratio and time to rest ratio increased incrementally. Twenty-four hours later, heart weight and left ventricle weight, and Hand2 gene expression were measured. To assess the data, one-way ANOVA was utilized and schaffe test was used to point out the place of significancy (α ≤ 0.05).
Results: Findings showed that heart and left ventricle weights after endurance and high intensity interval training were significantly more than the sham and control groups. In addition, Hand2 expression was changed significantly in the endurance (6.76) and interval (6.15) rather than the sham (1.05) and control groups(1 fold).
Conclusion: In the situation of the present study, both of Endurance and Interval training regimens increase Hand2 gene expression, heart weight and left ventricle weight. Because of the shorter training time, high intensity interval training can be more beneficial to be executed.
Dr. Mohammad Gharaat, Prof. Majid Kashef, Prof. Behnam Jameie, Prof. Hamid Rajabi,
Volume 26, Issue 4 (7-2018)
Abstract
Introdution: Physical training causes functional and morphological changes in myocardium in response to regulatory adaptations same as Phosphatidilinositol-3-kinase (PI3K) changes. Present study aimed to experimentally investigate the effects of endurance and high intensity interval training on PI3K, structure and function of heart.
Methods: 24 adultmale rats (weight 221.6 ± 11.4 grams) divided randomly into control, sham, interval and endurance groups(n=6). The endurance group swam for 12 weeks/5 days per week. Also, the interval group swam 12 weeks/4 days per week. Twenty-four hours after the last exercise, echocardiography was done and 48h later, heart weight and left ventricle weight, and plasma for PI3K measurement (using ELAISA Reader) was taken. To assess the data, one-way ANOVA was utilized and Tukey-HSD was used to point out the place of significancy (α ≤ 0.05).
Results: Findings showed that heart (p= 0.03) and left ventricle weights (p= 0.01), stroke volume (0.01), Left ventricular end diastolic volume (0.04), and ejection fraction (p= 0.02) after endurance and high intensity interval training were significantly more than the sham and control groups (p< 0.05). In addition, PI3K significantly increased (p= 0.00) in the endurance (6.58 ng/ml) and interval (6.67) rather than the sham (5.37) and control groups (4.07).
Conclusion: It can be concluded that both the endurance and interval training schedules increase PI3K and they led to physiological hypertrophy of heart. Since the whole time of high intensity interval training is significantly shorter than that of the endurance training (~ 9%), it seems more beneficial to be executed.
Mohammad Mahdi Bagherpour Tabalvandani, Mohammad Reza Fadaei Chafy, Alireza Elmieh,
Volume 30, Issue 5 (8-2022)
Abstract
Introduction: The aim of this study was to investigate the effect of time and age on morphological changes in male rats.
Methods: For conducting this study, 15 male Wistar rats in three age groups of 2 weeks (150-100 g), 6 weeks (250-220 g) and 96 weeks (320-280 g) were kept in Pasargad Tissue and Gene Laboratory in Tehran City for six weeks and 48 hours later they were dissected and the soleus muscles was extracted. Cross-sectional area and number of muscle fibers were measured by light microscopy. Immunohistochemical method was used to measure sema3a and NCAM proteins of muscle fibers. To determine the differences between the groups, one-way analysis of variance with Tukey post hoc test was used at the significant level of p≤0.05. Statistical analysis was performed by Prism5 software.
Results: The results showed that there was a significant difference in the cross section of muscle fibers between the three age groups: children and young people (p=0.01), children and the elderly (p=0.049), and finally young people and the elderly (p=0.049). There was also a significant decrease in the number of muscle fibers in the age group of elderly compared to children and elderly to young people (p≤0.001). Moreover, sema3a protein expression increased significantly over time between the age groups of children and young (p≤0.048), children and elderly (p=0.0001) and finally young and elderly (p=0.0001). NCAM protein expression significantly reduced in three age groups: children and young people (p=0.048), children and controls (p=0.0001), and young and elderly people (p=0.001).
Conclusion: The results showed that with increasing growth from childhood to youth, hypertrophy increases and decreases in old age, in addition the process of hyperplasia will decrease with age. In addition to proteins involved in axonal growth due to growth decrease and neurodegenerative proteins also increase.
