摘要：Kelly JS, Metcalfe J. Validity and Reliability of Body Composition Analysis Using the Tanita BC 418 MA. JEPonline 2012;15(6):74-83. This investigation compared measurements of percentage body fat (%BF) by bioelectrical impedance analysis (BIA) using the TANITA BC418-MA (TAN) with hydrostatic weighing (HW), and skinfold thickness (ST) (Study 1). In addition, the same-day test-retest reliability of the TAN system was assessed (Study 2). For Study 1, a sample of 28 male and 29 female subjects were recruited. TAN, HW, and ST were used to assess %BF with the same experimenter completing all assessments in a counterbalanced order. In Study 2, 24 males and 28 females had %BF measured on two occasions using the TAN to establish the same-day test-retest reliability of the system. Results for Study 1 indicated that TAN and ST recorded significantly different mean %BF compared to HW, with %BF being overestimated by 1.68% using TAN and 1.49% using ST. Despite strong correlations between TAN and HW (r = 0.81; P<0.05) there was relatively poor agreement between the %BF measurements from TAN and HW (±9%), although the level of agreement between ST and HW was little better (±8%). The same-day test-retest reliability of TAN was good with no mean bias from test to test and excellent limits of agreement (<1%). In conclusion, the TANITA BC418-MA is a reliable system, which has poor agreement with laboratory-based methods of assessment (HW). However it is on a par with assessment by skinfold thickness and provides a non-invasive alternative, which requires less operator training.
