the effect of High intensity circuit training on Oxidative biomarkers, body composition and performance in youth soccer player.

Determination of the effect of high intensity circuit training on serum levels of oxidative biomarkers, body composition and physical performance of male soccer players

The present study is a randomized controlled clinical trial study.

In this study, 21 voluntary adolescence soccer player boys, aged 14 to 16 years, in a way available and voluntary were selected and randomly divided into two training groups: and control group. At pre-test and post-test from all subjects had resting blood samples and one hour after maximal aerobic activity. Body composition test with body composition analyzer and functional tests was also performed before onset the training. All exercises were performed at the Khaje Nasir Toosi University Sports Complex. All functional tests, body composition and blood sampling were performed at the Physical Education Laboratory of Tehran University.

1. Youth soccer players 16-14 years old 2. Absence of any illness or physical disorder 3. Experts in soccer (at least 2 years in league competitions) 4. Subjects did not use medication or sport supplements 3 months prior to intervention 5. The gender of the subjects is male 6. Use the same standardized diet 2 days before the pre-test and post-test 7. Full consent of parents and subjects to conduct tests, tests and interventions

1- training group who trained for 8 weeks, 3 days a week, with 80% of maximal heart rate in the first 4 weeks and 85 to 90% of maximal heart rate in the second four weeks. 2- The control group continued the usual practice of soccer training - the same volume as the training group.

8 weeks of High Intensity Circuit training does not cause significant oxidative stress on the soccer teenager's body, while it can have a significant effect on improving sport performance.

Randomization method: Simple randomization Random unit: Individual Randomization Tool: Shuffle Cards Random Sequence Construction Method: The sample selection method will be available in this study and randomly divided into two distinct groups. Prior to the implementation of the research, 22 ،14 to 16 year-old boys were selected after completing the health questionnaire in physical activity and obtaining personal data. The names of the subjects are recorded on individual cards (each subject has a special card). Then all the cards are thrown in the rundle and are thrown well. After each time, a card is pulled out of the ball and placed in the control or intervention according to the even or Odd number. The odd numbers placed in the control group (1) and the even numbers (2) are in the intervention group. Accordingly, the first shuffle place in the control group and the second one in the intervention group. Then completing and registering names in their groups, to hide the process of grouping the subject, through a letter packed with their status in the study and their group will inform the subject. In this letter, the groups are marked with the number and the full description of each group's actions is mentioned. For example, in the closed letter, the first card that out of the ball, are cited the person's activities during the intervention, and the number of his group (group 1).

Subjects, instructors, and experts evaluating field and biochemical tests are kept blind in this study. In relation to the participant, each subject will be informed about the necessary details of their duties as well as their group number in a closed letter. The letter does not mention the group name and only the group number. However, in order to respect the ethics and rights of the subject, all of the tasks and actions that are to be performed are described. individuals in the control group with code 1 and those in the intervention group with code 2 coding and information on performing tests and interventions for each group are fully explained and described in a separate class for each group. In addition, in order to perform the research plane, 2 coaches were assigned by a closed letter, while explaining all the training and safety issues for each group. Performing blood tests and blood sampling are also performed by technicians and testers who are fully aware of the tests. None of the examiners had any information about the intervention status of the subjects. Therefore, in this study, none of the instructors, subjects, and examiners have any information about the status of the subjects (which group is the intervention group and which one is the control group), although the tasks and all the tests and safety aspects will be describe for them.

All functional , biochemistry, and body composition information of each subject based on individual number can be provided to valid researchers.

12 months after publication of research results

Academic researchers

For the purpose of follow-up or meta-analysis studies

University of Tehran, Dr. Abbas Ali Gaeini

Documents for teaching at one of the universities approved by the Ministry of Science and Technology of the Islamic Republic of Iran sent to email address: alireza.niknam@yahoo.com. After two days, an email will be sent to the selected researcher to provide a brief report on how to do the research. Subsequently, if the Responsible researcher of this study, Dr. Abbas Ali Gainei agrees, all information required in an Excel file will be provided to the selected researcher while maintaining the confidential information of the subjects including their name, contact number, address and personal information. This process also takes a week.