生物阻抗分析法(BIA)可簡便、快速、無侵入性地估測身體組成。本研究探討BIA如何正確的應用在特定的族群，更建議要依受測者條件選擇適合的估測方程式。本研究以21名臺灣體院男子籃球隊員為受測者（年齡20.8±1.7歲，身高185.2±7.5 cm，體重80.5±13.2 kg），以雙能X光吸收儀(DEXA)為效標，比較多肢段生物阻抗分析儀(BIA8)所估算出各肢段的去脂肪質量(FFM)及以應用多元迴歸分析所得到的各肢段FFM之估測方程式，該FFM方程式應用的變數為阻抗值、配年齡、身高及體重等參數。結果顯示：籃球運動員在各位置的身高、體重、體脂肪百分率及全身FFM，後衛、前鋒（後衛<前鋒）及後衛、中鋒（後衛<中鋒）比較皆有顯著差異(p<0.05)，但前鋒和中鋒之間無顯著差異(p>0.05)。新建立預估方程式估測所得之FFM及BIA8測出之FFM與DEXA的相關係數分別為r = 0.932、0.941，兩者與DEXA測出之FFM皆有高相關。DEXA對BIA 8的bias為-2.964 kg，新建立之預估方程式估測優於BIA8的測量結果；新建立之體組成方程式、BIA8對DEXA的FFM偏差範圍(2 S.D)分別為5.320及6.321 kg，新建立預估方程式優於BIA8的測量結果。結論：本研究之籃球運動員其前鋒和中鋒的體型相近。另外；以新建立之預估方程式估測籃球員的FFM優於多肢段生物阻抗分析儀(BIA8)之測量結果。

　　Bioelectrical impedance analysis (BIA) can estimate body composition easily, rapidly and non-invasively. However, the prediction variation always exists between various cohorts by the everyone predictive equation. To improve the precision and accuracy of BIA measurement of body composition in athletes, 21 elite basketball players which are 20.8±1.7 years old with 185.2±7.5 cm in height and 80.5±13.2 kg in weight, were recruited to be measured by dual-energy X-ray absorptiometry (DEXA). The bioelectrical impedance, age, height and weight were calculated to create a new linear regression equation (LR) for predicting the fat free mass (FFM) for basketball players especially. The evaluated values for body composition by this predictive equation were compared to that of by BIA. The high relative correlations (R value) between the FFM measured by DEXA vs. by LR was as 0.932 and that of by BIA as 0.941. The bias as -2.964 kg in BIA was greater than in LR. The 2 S.D. in LR as 5.320 kg was less than in BIA as 6.321 kg have shown the predictive performance in LR was superior than in BIA. In short, the forward players and guard players have the similar body compositions in Taiwan area. The predictive performance in our newly created LR was greater than that of BIA.