規律運動者的腹部脂肪分佈和體圍的關係

The Relationship Between Regular Exercisers' Abdominal Fat Distribution and Body Circumferences

許多研究利用腰圍與臀圍來預估腹部脂肪的分佈，甚至推測罹患心血管疾病與糖尿病的機率。然而，這些研究大部份都以一般大眾為研究對象，鮮少討論規律運動者或運動員腹部脂肪分佈與體圍的關係。研究目的：瞭解規律運動者的腹部脂肪分佈與體圍的關係。方法：以磁共振造影法（magnetic resonance imaging，簡稱MRI）測量31位自願參與本研究，長期從事慢跑、游泳與重量訓練的規律運動者（運動組，年齡31.5±11.4歲，身體質量指數23.2±2.2kg／m2）和12位坐式生活者（控制組，年齡33.0±6.3歲，身體質量指數20.5±2.2kg／m2）的腹部脂肪分佈。受試者的腰圍與臀圍由不具彈性的皮尺測量，再計算出腰臀圍比（waist-to-hipratio）。結果：運動組與控制組的腹部內臟脂肪體積為0.58±0.3升、0.84±0.3升；腹部皮下脂肪體積2.05±0.9升、2.22±0.9升；腰圍78.6±4.5公分、77.4±6.3公分；臀圍94.2±4.4公分、91.5±4.4公分；腰臀圍比0.83±0.03、0.85±0.04。運動組腹部內臟脂肪體積與腰臀圍比、腰圍、身體質量指數達顯著相關（0.67、0.66、0.51，p<0.05）。以逐步迴歸法分析（stepwiseregression），腰臀圍比可解釋腹部的內臟脂肪45%；當腰臀圍比與身體質量指數同時進入迴歸分析時，可解釋腹部的內臟脂肪58%。結論：雖然規律運動者有較少量的腹部內臟體積，在本研究仍可藉由腰臀圍比與質量指數來預估其腹部內臟脂肪。

Many studies have used waist circumference (WC) and hip circumference (HC) to predict abdominal fat distribution. However, most of these studies have focused on the general population. PURPOSE: To determine whether abdominal body circumferences can predict fat distribution. METHODS: Thirty-one individuals (age 31.5 ± 11.4 years, body mass index 23.2 ± 2.2 kg/m2) who had been regular joggers, swimmers and weight lifters for more than 5 years served as the exercise group (EXE). Twelve sedentary persons (age 33.0 ± 6.3 years, BMI 20.5 ± 2.2 kg/m2) were the control group (CON). Magnetic resonance imaging (MRI) was used to determine abdominal fat volume distribution. A non-elastic ruler was used to gauge waist circumference (WC) and hip circumference (HC). The waist-to-hip ratio (WHR) was calculated as the WC divided by HC. RESULTS: The EXE and CON groups' abdominal visceral fat volume were 0.58 ± 0.3L, 0.84 ± 0.3L; abdominal subcutaneous fat volume 2.05 ± 0.9L, 2.22 ± 0.9L; WC 78.6 ± 4.5 cm, 77.4 ± 6.3 cm; HC 94.2 ± 4.4 cm, 91.5 ± 4.4 cm; WHR 0.83 ± 0.03, 0.85 ± 0.04, respectively. Abdominal visceral fat volume was significantly correlated with WHR, WC and BMI (0.67, 0.66, 0.51, respectively; p < 0.05). Using stepwise regression, WHR could explain 45% the variance of the abdominal fat volume. When both WHR and BMI entered the regression analysis, the variance explanation could reach 58%. CONCLUSION: The waist and hip circumference can predict the visceral fat volume of people who exercise regularly.