Hydrostatic Weights of Patients with Spinal Injury

Abstract

The purpose of this study was to estimate the reliability of body density measurements from the hydrostatic weights of subjects with spinal injuries in standard sit-in and Hubbard tanks. Nineteen outpatients with spinal injuries participated in the study. Residual lung volume and hydrostatic weights were measured in two laboratories. Body density and percentage of body fat were determined from hydrostatic weights. Statistical tools were the t test for correlated samples and the Pearson product-moment correlation coefficient. The alpha level was set at .05. Reliability coefficients for body density and percentage of body fat were .98 and .99, respectively (p less than .05). Trial means were not significantly different. We conclude that a standard sit-in tank or a Hubbard tank can be used to determine body density and percentage of body fat of patients with spinal injuries. Modifications should be made for sitting posture, and standard densitometric procedures should be followed.