This study used a dual-energy X-ray absorptiometry （DXA） method to investigate how body weight relates to fat-free mass index （FFMI） and fat mass index （FMI） in Japanese female college judo players. 43 Japanese female judo players （age: 20.4±1.2 years） who belonged to a college judo club participated in this study. The whole-body fat-free mass and fat mass were measured to the nearest 0.1 g using a DXA method. The fat-free mass and fat mass obtained were divided by the square of the height （m） to give the FFMI and FMI, respectively. Pearson’s product-moment correlation was used to examine the association between body weight and FFMI, and also between FMI. Body mass was positively correlated with FFMI （r = 0.90, P < 0.01） and FMI （r = 0.95, P < 0.01）. These results indicate that when the body weight increases, it is accompanied by an increase in FMI among Japanese female college judo players.
