فصلنامه دانشگاه علوم پزشکی جهرم (Feb 2012)
Growth hormone and blood sugar changes following maximal and submaximal exercises in the young athletes
Abstract
Introduction:Growth hormone is a strong metabolic factor that facilitates growth and hypertrophy and increase transfer of amino acids into the cells. Exercise is a potent stimulant of growth hormone secretion. If it is regularly done, the rate of hormone secretion increases in 24 hours. In previous studies, the role of championship training has been little considered. So, given the importance of the above-mentioned hormone in puberty period and the necessity of participation in the championship, this study aimed to investigate the relationship between physical activity in championship level and changes of this hormone.Material and Methods:12 male adolescent athletes Estahban were chosen as the subjects. Finally, eight of them (mean age= 14.44, height= 1.56 m and weight= 46.3 kg) participated in the study. Blood samples were collected before exercise, after 10 weeks of submaximal exercise, and at the end of 3 weeks of maximal exercise. ,. The samples were collected 12 hours after the last training.Results: The results indicated that submaximal exercise had no significant effect on baseline growth hormone and blood sugar (p=0.446, p=0.289). But maximal training caused a significant increase in the baseline growth hormone and blood sugar (p=0.048, p=0.045).Conclusion: According to the results, exercise intensity below the maximum for male adolescents has a significant impact on the amount of baseline growth hormone whereas maximal exercise increases the amount of baseline growth hormone significantly. Increased growth hormone leads to increased protein synthesis, increased bone, increased muscle size and improved athletic performance.
