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        1 - The effect of D-ribose supplementation on LDH, CK and MDA following a plyometric activity in young beginner wrestlers
        Bahman Hasanvand Darush Nazari
        Introduction: The present study was conducted with the aim of the effect of D-ribose supplementation on LDH, CK and MDA following a plyometric activity in young beginner wrestlers.Methods: In this semi-experimental study, which was conducted with a repeated measurement More
        Introduction: The present study was conducted with the aim of the effect of D-ribose supplementation on LDH, CK and MDA following a plyometric activity in young beginner wrestlers.Methods: In this semi-experimental study, which was conducted with a repeated measurement design, 32 young beginner wrestlers from Khorramabad city, with an age range of 15 to 18, were selected as available, and in 2 groups of 16 people, they took D-ribose supplements with They were treated with plyometric exercise and taking a placebo along with plyometric exercise. In the pre-test stage, the first stage of blood sampling was done. In the D-ribose supplement- plyometric exercise group, the participants took 15 grams of D-ribose supplement one hour before performing the activity and performed the relevant plyometric exercises. 24 hours and 48 hours after performing the plyometric exercise, the second and third stages of blood sampling were performed, respectively. In the placebo group - plyometric exercise, the participants consumed 15 grams of placebo (sorbitol and β-cyclodextrin) one hour before performing the activity.Findings: The obtained data were analyzed by the analysis of variance test with repeated measurements. The results showed that D-ribose supplementation is effective in reducing lipid peroxidation (MDA) and oxidative stress (CK, LDH) indices following a plyometric activity (P<0.05).Conclusion: According to the results of the present study, it is recommended that young wrestlers use D-ribose supplementation to prevent the occurrence of oxidative stress and lipid peroxidation caused by relatively intense sports activities and its subsequent consequences. Manuscript profile
      • Open Access Article

        2 - Comparison of the Effects of Plyometric Training and Subsequent Detraining on Muscle Performance in Elite Male Volleyball Players
        Mohsen Meftah Tahereh Bagherpoor Nematollah Nemati
        Nowadays, most of the championship coaches are looking for new methods of designing their athletes’ exercises; one of these methods is plyometric (explosive) exercise in which the stretch-shortening cycle is practiced. this exercise is done for mucle stretch (extr More
        Nowadays, most of the championship coaches are looking for new methods of designing their athletes’ exercises; one of these methods is plyometric (explosive) exercise in which the stretch-shortening cycle is practiced. this exercise is done for mucle stretch (extravasation) and it is immediately followed by rapid shortening (Intra ventricular). Therefore, the effectivness of this type of exercise on muscle performance is evaluated using standard physical fitness tests. .The population of this study included 400 volleyball players from different clubs of Semnan city. Out of the mentioend population, 20 people were selected based on height, weight, age and volleyball talent tests, and they were randomly assigned to two groups incouding a cotnrol and an eperimetnal group (10 people in each group). The control group received no exercise, and the experimental group received standard plyometric training 3 sessions a week. In these sessions, the muscle performance (agility, endurance, leg flexor strength and explosive power) was evluated by digital devices at weeks 4, 8 and 12 (4 weeks of detrainig) as the pretest. The results showed that there was a significant difference between the effects of the plyometric exercise and detraining on endurance, leg muscle strength, and explosive power; however, there was no significant difference between plyometric training and detraining on the athletes’ agility. According to the results of the post-test compared to the pre-test, it can be stated that plyometric trainign and non-exercise training have respectively resuteld in the higehst increase of explosive power by 10.9%, endurance by 4%, and leg muscle strength by 3.8% with the mean of 3.8%. However, these exercises had not effect on agility. Manuscript profile