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The Effects of Different Load Training on Children’s Swimming Performance, Growth Hormone and Thyroid Hormone.
swimming training and performance
Purpose: To investigate the effect of different load swimming training on children’s performance (25m and 100m free style), growth hormone (GH), thyroid hormone (T3,T4) and thyroid stimulating hormone (TSH) concentration. Methods: There were 35 male swimming team members (at least trained one year) and 15 general students (hadn’t received any training), ages from 10 to 13 years old, were recruited as the subjects of this study. The average high and weight of training boys and general boys were 143.2 +- 12.6cm and 37.2+-10.8kg, and142.1+-10.2 cm and 34.45+-7.98kg, respectively. The training load was 5 days per week, 1.5 hours each day for training team members and 3 days per week, one hour each session for general boys and lasted for 12 weeks. The blood samples were taken before training, after 4 weeks of training and after 12 weeks of training at 8 am after 8 hours fasting for GH, TSH, T3 and T4 analysis. The collected data were analyzed with 2-way ANOVA. Results: 1, The GH concentrations of trained members were significantly higher (p<.05) than that of general boys from pre test to post test. However, there were no significant differences of T3, T4, and TSH between two groups at different tests. 2, The T3 after 4 weeks and after 12 weeks of training of both groups were significantly higher than that of pre test. The TSH after 4 weeks of training was significantly higher than pre test and then dropped significantly (P<.05). The T4 was not different among different testing periods. 3, the 25m and 100m performances were improved significantly after 4 weeks of training, and the performances of 12 weeks of training were better than that of 4 weeks of training. Conclusions: The prolonged swimming training will increase children GH level may benefit the muscular and bone growth. The training programs 3 days per week for general children and 5 days per week for team members will improve their swimming performance.
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