背景：每項運動皆有其特性，參與不同運動表現在身體組成可能產生差異。目的：比較參與不同運動社團兒童表現在身體組成的差異。方法：共95名兒童參與本研究，分別為對照組（C組，N=31）、羽球組（B組，N=30）和游泳組（S組，N=34），B組和S組為參與運動社團時間達一年以上者。本研究以生物電阻分析法檢測身體組成，分析項目包括身體質量指數(BMI)、全身脂肪率和全身肌肉率，本研究並計算上肢左右肌肉量百分比（（左側肌肉量／右側肌肉量）×100）來調查參與不同運動社團者之四肢肌肉量分布狀況。資料分析包含描述性統計、單因子變異數及Tukey事後檢定，顯著水準訂為p<.05。結果：BMI在三組間無顯著差異；全身脂肪率為C組(24.9±7.7%)顯著高於B組(18.4±6.3%)和S組(18.6±6.4%)；全身肌肉率為B組(43.4±3.2%)和S組(43.5±3.4%)顯著高於C組(39.9±4.1%)。另外，四肢肌肉量分布狀況，上肢左右肌肉量百分比為B組(90.7±6.0%)顯著低於S組(97.7±6.0%)和C組(98.0±4.7%)。結論：參與不同運動社團兒童可能有不同的身體組成，特別是羽球組的上肢左右肌肉量分布差異明顯大於游泳組與對照組。未來仍需以不同族群為對象來進行相關的研究及探討。

Purposes: This study was to determine the differences of body composition among children in sports clubs. Methods: A total of ninety-five children who had been participating sports clubs over one year were recruited in this study, 31 (16 boys, 15 girls) were in control group (CG), 30 (16 boys, 14 girls) were in badminton group (BG) and 34 (18 boys, 16 girls) were in swimming group (SG). The bioelectric impedance analysis (InBody 230, Biospace Co., Ltd., Seoul Korea) was selected to measure the body composition, including body mass index (BMI), the percentage of body fat, and the percentage of body lean mass. The ratio of lean mass in left/right arm ((left arm/right arm)(superscript *)100) was calculated to investigate of lean mass in arms among children in sports clubs. Data analyses included descriptive statistics, one-way ANOVA and Tukey's HSD. The statistical significance level was set at p<.05. Results: There was no significant difference among three groups in BMI. The percentage of body fat in CG (24.9±7.7%) was significantly higher than those in BG (18.4±6.3%) and SG (18.6±6.4%). The percentage of body lean mass in BG (43.4±3.2%) and SG (43.5±3.4%) were significantly higher than that in CG (39.9±4.1%). Regarding the ratio of lean mass in left/right arm, BG (90.7±6.0%) was significantly lower than those in SG (97.7±6.0%) and CG (98.0±4.7%). Conclusions: The children participating in various sports may have different development in body composition, especially the difference of lean mass between left and right arms in badminton group was greater than those in both swimming and control groups. More studies should be widely conducted to investigate the difference of body composition among different populations in the future.