Background: The transition from childhood to adulthood is associated with many physiological changes that result from hormonal changes. Despite this, it has been reported that hormonal response to exercise can be age-dependent.the purpose of this study was to investigate growth hormone, insulin, testosterone, and cortisol response to acute intensive exercise in children, adolescents, and youth male athletes. Materials and Methods: Twenty-nine eligible football players volunteered to participate in the study. Participants assigned to three groups: children (age = 10.88 ± 0.92, n=9), adolescents (age = 14.40 ± 1.17, n=10), and youth (age = 17.70 ± 0.82, n=10). The Bruce Protocol Stress Test was performed as an acute intensive exercise on treadmill. Plasma hormones were measured before and after the exercise. Results: The acute intensive exercise leads to a significant increase in circulating levels of testosterone (p = 0.02) and Cortisol in children (p = 0.001). In the adolescent group, only a significant increase in GH (p = 0.001) was observed. In the youth group a significant increase in GH (p=0.05) and testosterone (p=0.001) was observed. However, insulin levels did not change significantly after intensive exercise in all groups. Results showed that there were no significant differences between hormonal changes within the three groups. Conclusion: The results showed that the basal levels of some hormones and their changes after exercise were different. However, the pattern of hormonal changes after acute intensive exercise was similar in children, adolescents, and young athlete boys. پرونده مقاله

Background: One of the reasons in judo fight is the accumulation of muscle lactate; therefore, searching for suitable method to reduce recovery time during competitions and comparing the recovery of male and female judo players is the aim of this research. Materials and Methods: 17 judokas including nine men (age: 19.94±1.68, weight: 68.57±10.03 and height: 176.77±7.44) and eight women (age: 25.62±3.48, weight: 62.70±40.0 and height: 160.7±87.31), voluntarily participated in semi-experimental study. Subjects performed Uchi-kumi training until exhaustion in two separate sessions as two active and passive recoveries with a time interval of 48 hours. Blood lactate was measured before, immediately, 5 and 10 minutes after exercise. In passive recovery, subjects sat on a chair, and in active recovery, uchi-kumi training was performed without a training opponent. Data were analyzed by analysis of variance with repeated Measures and t-test. Results: After 5 minutes, lactate reduction was significant only in active recovery for men (P=0.001) and women (P=0.001); But in 10th minute of recovery, lactate reduction in both active states for men (P=0.001) and women (P=0.048) and passive states for men (P=0.001) and women (P=0.001) It was significant. In addition, the changes between men and women were similar in both cases. Conclusion: An increase in blood lactate after uchi kumi training was expected; however, passive recycling required at least 10 minutes. Therfore, 5 minutes of Uchi Kumi training without a training opponent, regardless of the effect of gender, accelerated the recovery and prepared the judokas to participate in the next competition. پرونده مقاله