不同間歇時間之游泳間歇訓練對甲狀腺素與身體組成的影響

Abstract

目的：在探討12週游泳間歇訓練之不同間歇時間對於甲狀腺素與身體組成之影響。方法：本研究以38名可以完成100公尺但未受過正式游泳訓練的成年人為研究對象，隨機分派至10秒組、30秒組和60秒組。以漸增負荷的訓練方式，每週至少三天，每次約一小時，強度達到80% HRmax以上。分別在前測、中測（第5週）和後測時收集安靜時血液分析三碘甲狀腺素（T3）、四碘甲狀腺素（T4）和促甲狀腺素（TSH）及測量體重與體脂肪百分比等。所得資料以 SPSS12.0 for Windows統計軟體分析，進行二因子混合設計變異數分析（two-way ANOVA）考驗，達顯著差異進行薛費（Scheffe’）事後比較，統計顯著水準為α=.05。結果：（1）12週的高強度游泳間歇訓練會造成T3與T4濃度的降低（p<.05），TSH沒有改變，但三組之間甲狀腺素濃度沒有差異；（2）12週的高強度游泳間歇訓練對體脂肪百分比沒有改變。結論：十二週高強度游泳間歇訓練對身體機能造成足夠的刺激，造成甲狀腺素濃度降低，因此甲狀腺素濃度的變化能夠當作觀察運動刺激是否足夠的指標之一。

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.