축구선수의 신체구성 변화에 대한 BIA 측정기의 준거관련 타당도 증거

Abstract

Bio-electrical Impedance Analyzer (BIA) has been widely used to measure person's body fat because it is a safe, rapid, and accessible method. Limited evidence of validity, however, was provided for BIA technique. The purpose of this study is to establish validity evidence of BIA to measure for changing body composition. According to the Standards for Educational and Psychological Testing (AERA, APA, & NCME, 1999), validation is an ongoing process of accumulating various types of evidence to support the intended use and interpretation of test scores. For this study, the validity evidences based on relations to other variables was established. The BIA instrument, Bio Space Inbody 4.0, was used to obtain percent body fat on 37 male soccer players in Kyeng-ki. To establish the validity evidence based on relations to other variables, percent body fat from BIA was compared to that of Dual-Energy X-ray Absorptimetry (DXA). Two measures(before and post) in both tests were gathered from same time. Comparison indexes (i.e., intercept, slope, mean, & valiance) in Latent Growth Model of Structural Equation Modeling was used to analyze the data. Percent body fat obtained from BIA changed measures was positively correlated with those of DXA changed measures (r = .53, t=2.3, p<.01). There are statistically significant difference in percent body fat changes between DXA and BIA in both intercept and slope (p<.001). Based on the study results, the BIA method appears to be a valid method of measuring percent body fat pattern while to be a unclear evidence of measuring change of percent body fat.