TOTAL AND SEGMENTAL BODY COMPOSITION EXAMINATION IN COLLEGIATE FOOTBALL PLAYERS USING MULTIFREQUENCY BIOELECTRICAL IMPEDANCE ANALYSIS AND DUAL X-RAY ABSORPTIOMETRY

摘要

The current study examined the influence of player position on the agreement between multifrequency bioelectrical impedance analysis (MfBIA) and dual X-ray absorptiometry (DXA) when assessing total and segmental percent body fat (BF%), fat mass (FM), and fat-free mass (FFM) in National Collegiate Athletic Association Division I collegiate football athletes. Forty-four male collegiate athletes (age = 19 +/- 1 year; height = 1.9 +/- 1.0 m; and body mass = 106.4 +/- 18.8 kg) participated. Player positions included: offensive linemen (OL; n = 7), tight ends (TE; n = 4), wide receivers (WR; n = 9), defensive linemen (DL; n = 6), defensive backs (DB; n = 8), linebackers (LB; n = 6), and running backs (RB; n = 4). Total and segmental body composition measured using MfBIA were compared with values obtained using DXA. Compared with DXA, MfBIA underestimated BF% (3.0 +/- 3.8%), total FM (2.5 +/- 4.3 kg), arm FM (0.4 +/- 0.8 kg), arm FFM (1.4 +/- 0.9 kg), leg FM (2.8 +/- 2.0 kg), and leg FFM (5.4 +/- 2.4 kg) (all p 0.001; arm FM p = 0.002) and overestimated total FFM (-2.4 +/- 4.5 kg) (p 0.001). Limits of agreement (LOAs) were: +/- 7.39% (BF%), +/- 8.50 kg (total FM), +/- 1.50 kg (arm FM), +/- 1.83 kg (arm FFM), +/- 3.83 kg (leg FM), +/- 4.62 kg (leg FFM), and +/- 8.83 kg (total FFM). No significant differences were observed between devices for trunk FM (-0.3 +/- 3.0 kg; p = 0.565) and trunk FFM (0.4 +/- 2.4 kg; p = 0.278), with LOAs of +/- 5.92 and +/- 4.69 kg, respectively. Player position significantly affected all between-device mean body composition measurement differences (adjusted p = 0.05), with OL demonstrating the greatest effect on each variable. Therefore, MfBIA does not seem accurate in examining betweenplayer body composition in college football players.