Effect of exercise-induced changes in residual lung volume on the determination of body composition

The transient increase in residual lung volume (RV) as a result of exercise has been well documented. An accurate assessment of exercise-induced RV would be important when hydrostatic weighing (HW) is performed after exercise. The purpose of this study was to determine whether accurate HW measures could be performed after exercise when changes in RV are measured. Subjects (n = 32) performed pulmonary function (vital capacity [VC]-estimated RV), oxygen dilution-determined RV, and HW measures before and after either a maximal treadmill test (n = 16) or seated rest (n = 16). Two-way analysis of variance (p