[[alternative]]An association study of physical activity and body composition for adolescents in Taiwan

[[abstract]]目的：瞭解國內青少年身體活動量與身體組成現況及探討身體活動量與身體組成之相關性。方法：使用行政院衛生署2010~2012年所進行台灣國小、國中、高中職生「國民營養健康狀況變遷調查」之問卷與體檢資料進行分析，其年齡層為國小四年級至高中職三年級學生，共取出有效樣本2,732人為分析對象，為次級資料分析。身體組成以DXA進行檢測，不同強度的身體活動資料則以結構式問卷進行調查。所得資料利用獨立樣本t-檢定、one way ANOVA及pearson相關性分析來檢視研究假設及資料，顯著差異定為p25%，女性>30%作為青少年肥胖標準)。另外，動態身體活動時間與PBF之間具有顯著的負相關；而週間靜態活動時間則與腰圍具有正相關。結論：青少年動態身體活動時間普遍不足，靜態活動時間則過長，因此本研究建議青少年應增加動態身體活動時間及減少靜態活動時間以幫助維持較佳的身體組成。[[abstract]]Purpose: To investigate the status of amounts of physical activity and body composition in Taiwanese adolescents and the association between amounts of physical activity and body composition. Methods: A total of 2,732 adolescents (between 4th and 12th grade) from Nutrition and Health Survey of Taiwan Students (2010-2012) were analyzed in this study. All adolescents were measured by DXA examination for body compositions and face to face interviews with structured questionnaires for amounts and strength of physical activity. Independent T-test, one way ANOVA and PEARSON correlation were used to evaluate the study hypothesis and all statistical significance met p-value 25% for men and >30% for women). Moreover, there was a negative association between PBF and dynamic physical activities and there was a positive association between sedentary activity duration and waist circumference. Conclusions. Adolescents in Taiwan have not enough dynamic physical activities and spend too much time in sedentary activity. This suggests that adolescents should increase dynamic physical activities and decrease sedentary activity to improve body compositions