Ms. Negar Rostami, Dr. Mohamad Galedari,
Volume 19, Issue 21 (9-2021)
Abstract
Determining the intensity of exercise in children's sports programs has always been very important. The aim of this study was to investigate the rope skipping exercise with three different intensities on the acute response of salivary chromogranin A and alpha-amylase in girl students. 45 fourth grade students were divided into three groups (low, moderate and high intensity). They performed one session of rope skipping with three intensities of 50, 65, and 75% reserve heart rate, according to the metronome rhythm. The reserve heart rate was calculated by the Karvonen method. Samples of salivary immunoglobulin A and cortisol were collected before and immediately after the exercise and measured by the ELISA method. T-test and analysis of variance were used to evaluate the data. Alpha-amylase and chromogranin A increased significantly after all three intensities. It was Also shown that there is no significant difference between intensities in the amount of chromogranin A, While the amount of alpha-amylase in the group with an intensity of 75% of the reserve heart rate was more than 50%. Although more research is needed in this area, according to the present results, it can be said that probably a session of rope skipping with 50% of reserve heart rate has a less increasing effect on salivary alpha-amylase of girl students.
Reza Sabzevari Rad, Hekmat Ehsan Bakhsh, Ebrahim Fasihi Ramandi,
Volume 19, Issue 22 (12-2021)
Abstract
Adiponectin plays an important role in many metabolic and heart diseases. Regulation of liver enzymes is also essential for the health of the body's organs. Therefore, this study aimed to evaluate the effect of a HIIT training period on adiponectin levels and serum concentrations of liver enzymes in obese and overweight boys. 22 obese and overweight boys were selected and randomly divided into two groups of control and experimental. The experimental group performed eight weeks of HIIT pedaling with 80% HR reserve intensity for 3 days a week. The variables of adiponectin, aspartate aminotransferase (AST), alkaline phosphatase (ALP), alanine aminotransferase (ALT) using kits and laboratory methods as well as aerobic power, body mass index, and fat percentage of tests in the two stages before and after Exercise protocol was also measured and covariance test was used to compare the research variables and Pearson correlation coefficient was used to examine the relationship. The results were analyzed at a significant level (P<0.05) using SPSS software version 24. Performing eight weeks of HIIT exercise using a bicycle resulted in a non-significant reduction in adiponectin (P>0.05), AST(P>0.05) and ALP(P >0.05) enzymes. This exercise also significantly reduced ALT enzyme (P<0.05) and fat percentage (P<0.05) and increased aerobic capacity (P<0.05)
HIIT exercise strengthens aerobic power and reduces the percentage of fat and reduces the liver enzyme ALT in obese boys. Of course, more research is needed to clarify this issue.
