| Summary: | 碩士 === 國立臺灣師範大學 === 體育學系 === 93 === Purpose: To investigate the effects of different rest periods of interval training in swimming on thyroid hormone and body composition. Methods: this study aims at Thirty-eight (38) males who can swim 100 meters but have never been trained were the subjects. They were randomly assigned to three groups of different rest periods as 10s、30s and 60s. The subjects were trained by progressively increasing the training intensity and ultimately the intensity reaches at least to 80% HRmax. The frequency of training was three sessions per week, and one hour per session. Resting blood samples were colleted before, in the middle of (the 5th week) and after the training. Blood samples were analyzed for T3 (triiodothyronine), T4 (thyroxine), TSH (thyroid-stimulating hormone). Body weight (wt) and the body-fat percentage (fat%) were also measured before, in the middle of and after the study. The data were analyzed by SPSS 12.0 for Windows; the significant level is α＝.05. Results: (1) A 12 week interval training in swimming cause T3 and T4 to decrease (p<.05), but TSH remains unchanged. There is no difference in thyroid concentration among these three groups after the study. (2) Body weight and fat% remain unchanged during twelve weeks of training. Conclusion: A 12-week intensive interval training in swimming is enough to alter physical conditions, and cause a decrease in thyroid hormone. Therefore, the changes of thyroid hormone could serve as one of the indexes of whether the stimulus of training is sufficient or not.
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