Cassady S L, Nielsen D H, Janz K F, Wu Y T, Cook J S, Hansen J R
Department of Physical Education, University of Iowa, Iowa City 52242.
Med Sci Sports Exerc. 1993 Oct;25(10):1185-91.
The purpose of this study was to evaluate the validity and reliability of the Futrex 5000A near infrared (NIR) spectrophotometer for the assessment of body composition in children and adolescents. Forty-eight subjects (24 boys and 24 girls) with a mean age of 12.7 +/- 2.7 yr underwent three methods of body composition testing: NIR, densitometry by hydrostatic weighing (HYDRO), and skinfold anthropometry (SKF). Percent body fat (%BF) and fat free mass (FFM) derived from the Lohman's age-adjusted Siri equation served as the criterion. Within session test-retest reliability was determined for the NIR device for all subjects and between-week reliability was evaluated for all test methods in 14 subjects. Based on the excellent within- and between-session reliability (ICC ranged from 0.907-0.999), the system offers the potential of obtaining longitudinal data in growth and development studies. However, the significant mean differences, moderate correlations with the criterion (r = 0.62-0.71) and inflated standard errors of estimate (SEE = 4.9-5.5% BF, 2.2-2.9 kg FFM) and total prediction errors (TE = 5.5-8.0% BF, 2.7-3.7 kg FFM) indicate that refinement of prediction equations is needed to establish the measurement validity. Continued research with expanded populations is needed to further demonstrate and evaluate the utility of this device.
本研究的目的是评估Futrex 5000A近红外（NIR）分光光度计用于评估儿童和青少年身体成分的有效性和可靠性。48名平均年龄为12.7±2.7岁的受试者（24名男孩和24名女孩）接受了三种身体成分测试方法：近红外测试、水下称重法（HYDRO）测定密度以及皮褶厚度测量法（SKF）。采用Lohman年龄校正的Siri方程得出的体脂百分比（%BF）和去脂体重（FFM）作为标准。对所有受试者的近红外设备进行了组内重测可靠性测定，并对14名受试者的所有测试方法进行了周间可靠性评估。基于出色的组内和组间可靠性（组内相关系数ICC范围为0.907 - 0.999），该系统在生长发育研究中具有获取纵向数据的潜力。然而，显著的平均差异、与标准的中等相关性（r = 0.62 - 0.71）以及夸大的估计标准误差（SEE = 4.9 - 5.5% BF，2.2 - 2.9 kg FFM）和总预测误差（TE = 5.5 - 8.0% BF，2.7 - 3.7 kg FFM）表明，需要完善预测方程以确立测量有效性。需要对更多人群进行持续研究，以进一步证明和评估该设备的实用性。
