Effect of a 1 liter fluid load on body composition measured by air displacement plethysmography and bioelectrical impedance
Effect of a 1 liter fluid load on body composition measured by air displacement plethysmography and biolelectrical impedance. The purpose of this study was to determine if there is a difference in the body composition results measured by bioelectrical impedance analysis (BIA) using hand-to-hand (HBIA) and arm-to-leg (ALBIA) devices as well as air displacement plethysmography (ADP) using the Bod Pod before vs. after a 1 liter fluid load. A total of 35 males and females completed the study. Body composition was measured by the three methods after an overnight fast (baseline) and within 10 min of consumption of the fluid load. Body weight was significantly greater after fluid consumption (P<0.001). Percent body fat was significantly greater after fluid consumption for each device (P<0.01); HBIA (20.2±8.7 vs. 20.6±8.6), ALBIA (23.6±7.7 vs.24.3±7.9), and ADP (23.6±9.1 vs. 24.7±9.0). Therefore, ingesting a 1 liter fluid load just prior to measurement does appear to increase percent body fat results as determined by HBIA, ALBIA, and ADP, and thus protocol for measurements needs to be standardized in terms of fluid ingestion just prior to measurement.
ADP, BIA, Bod pod, Hydration
Heiss, Cynthia J., Naveen Gara, Daniela Novotny, Heather Heberle, Lindsey Morgan, Janelle Stufflebeam, and Megan Fairfield. "Effect of a 1 liter fluid load on body composition measured by air displacement plethysmography and bioelectrical impedance." Journal of Exercise Physiology Online 12, no. 2 (2009).
Journal of Exercise Physiology Online