جستجوی مقالات مرتبط با کلیدواژه « موش ویستار » در نشریات گروه « پزشکی »

The purpose of this study was to investigate the effects of high intensity interval training (HIIT) on visceral and subcutaneous levels of leptin, plasma glucose and insulin levels in male Wistar rats. 20 male rats (mean age: 8 week and mean weight: 190±10 gr) randomly divided into resistance training (n=7), HIIT (n=7) training and control (n=6) groups. Training program continued for 5 weeks (5 sessions/week). Training program consisted of running on treadmill with incremental increase in intensity of 37-52 meters per minute, 6-12 two minute bouts with 1 minute rest between the bouts. 72 hours after last training session and in fasting condition, rats were sacrificed and subcutaneous and visceral adipose tissue were removed. The samples were freezed and maintained at -80 C° for subsequent tests. We used independent T-test for data analysis. The results showed significant variations in visceral and subcutaneous levels of leptin and plasma levels of insulin between the training and control groups (p<0.05). But, the variation in glucose levels between the training and control groups was not significant (p>0.05). The results of this study showed that HIIT decreased visceral and subcutaneous levels of leptin, and reduced the risk factors associated with obesity. HIIT also reduced plasma insulin and glucose levels which can lead to decreased insulin resistance.

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. For this experimental study, 24 male rats (age 3 months; weight 221.6 ± 11.4 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 the swimming time increased incrementally. Also, the 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 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). 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). 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.

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.
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).
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).
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.