Reliability and concurrent validity of Futrex and bioelectrical impedance
Deutscher übersetzter Titel: | Reliabilitaet und vergleichsweise Validitaet der Futrex-Messung und des bioelektrischen Impedanzmessverfahrens |
---|---|
Autor: | Vehrs, P.; Morrow, James R.; Butte, N. |
Erschienen in: | International journal of sports medicine |
Veröffentlicht: | 19 (1998), 8, S. 560-566, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource Elektronische Ressource (online) |
Sprache: | Englisch |
ISSN: | 0172-4622, 1439-3964 |
DOI: | 10.1055/s-2007-971960 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU199901306261 |
Quelle: | BISp |
Abstract des Autors
Thirty Caucasian males (aged 19-32 yr) participated in this study designed to investigate the reliability of multiple bioelectrical impedance analysis (BIA) and near-infrared spectroscopy (Futrex, FTX) measurements and the validity of BIA and FTX estimations of hydrostatically (UW) determined percent body fat (%BF). Two BIA and two FTX instruments were used to make 6 measurements each of resistance (R) and optical density (OD) respectively over a 30 min period on two consecutive days. Repeated measures ANOVA indicated that FTX and BIA, using manufacturer's equations, significantly (p<0.01) underpredicted UW by 2.4 and 3.8%BF, respectively. Standard error of estimate (SEE) and total error (TE) terms provided by regression analysis for FTX (4.6 and 5.31%BF, respectively) and BIA (5.65 and 6.95%BF, respectively) were high. Dependent t-tests revealed no significant differences in either FTX or BIA predictions of %BF using two machines. Intraclass reliabilities for BIA and FTX estimates of UW %BF across trials, days, and machines all exceeded 0.97. A significant random error term associated with FTX and a significant subject-by-day interaction associated with BIA was revealed using the generalizability model. Although FTX and BIA estimates of UW %BF were reliable, due to the significant underestimation of UW %BF and high SEE and TE, neither FTX nor BIA were considered valid estimates of hydrostatically determined %BF. Verf.-Referat