Exercise and Health Laboratory, Faculty of Human Kinetics, Technical University of Lisbon, Cruz-Quebrada, Portugal.
J Sports Sci. 2012;30(12):1225-33. doi: 10.1080/02640414.2012.692481. Epub 2012 Jun 14.
Bioelectrical impedance spectroscopy (BIS) provides an affordable and practical assessment of fat-free mass (FFM). However, little information is available on the assessment of changes in fat-free mass in top-level athletes using BIS. The aim of this study was to examine the accuracy of BIS in tracking changes in fat-free mass of elite male judo athletes from a period of weight stability to just before competition, using the four-compartment model (4C model) as reference method. In total, 27 elite male judo athletes (age 22.2 ± 2.8 years) were evaluated. Measures of body volume assessed by air displacement plethysmography, bone mineral content by dual-energy X-ray absorptiometry, and total-body water assessed with deuterium dilution were used in a 4C model. Fat-free mass was also assessed by BIS (FFM(BIS)). Changes in FFM(BIS) were not significantly different from measured by the reference method (P = 0.000). Furthermore, the r² was 0.62 and the standard error of the estimate was 1.03 kg. The limits of agreement ranged from -3.36 to 2.59 kg with no bias observed. These findings demonstrate the viability of BIS as a valid tool for tracking fat-free mass in elite male judo athletes. However, based on the wide limits of agreement observed, BIS is less valid at an individual level for tracking fat-free mass in these athletes.
生物电阻抗谱（BIS）可提供经济实用的去脂体重（FFM）评估。然而，利用 BIS 评估顶级运动员去脂体重变化的信息却很少。本研究旨在使用四室模型（4C 模型）作为参考方法，检测 BIS 在跟踪精英男性柔道运动员从体重稳定期到比赛前去脂体重变化时的准确性。共有 27 名精英男性柔道运动员（年龄 22.2±2.8 岁）接受了评估。利用空气置换体积描记法评估体容积，双能 X 射线吸收法评估骨矿物质含量，利用氘稀释法评估全身水，4C 模型评估去脂体重。BIS 也用于评估去脂体重（FFM（BIS））。FFM（BIS）的变化与参考方法测量的结果无显著差异（P=0.000）。此外，r²为 0.62，估计的标准误差为 1.03kg。一致性界限范围为-3.36 至 2.59kg，未观察到偏差。这些发现表明 BIS 是跟踪精英男性柔道运动员去脂体重的有效工具。然而，根据观察到的广泛一致性界限，BIS 在个体水平上对跟踪这些运动员的去脂体重的有效性较低。
