Poster Topical Area: Sports Nutrition
Poster Board Number: 251
Objectives: The primary research aim of this study investigates if predicted thoracic gas volume (TGV) can be used in place of measured TGV when conducting Air Displacement Plethysmography, without sacrificing accuracy. Additionally, if measured TGV is required, how does measured TGV compare across multiple assessments at different points throughout an athlete's season.
Methods: A convenience sample of 111 collegiate male athletes (Ice Hockey, Basketball, Soccer, and Football) were invited to undergo multiple body composition assessments in the BOD POD. Athletes followed BOD POD specific protocol in preparation for each assessment. During the initial BOD POD, a measured TGV was obtained from 95 student-athletes, with 56 having multiple, measured TGV. To address the research questions, the authors examined measured and predicted TGV from the first two BOD POD assessments (n=56), and evaluated the results in conjunction with the acceptable variability (200-300 mL), detailed by the manufacturer in the Operator's Manual.
Results: When comparing measured TGV to predicted TGV for Assessment 1, the predicted underestimated, on average, by 137 mL. Of the 56 predicted values for Assessment 1, 39 values (69.6%) either over or underestimated TGV greater than the acceptable variability, when compared to measured. On average for Assessment 2, the predicted TGV underestimated by 124 mL compared to the measured. Thirty-seven predicted values (66.1%) for Assessment 2, either over or underestimated TGV greater than the acceptable variability. Interestingly, when comparing the measured TGV from Assessment 1 to Assessment 2, the average difference was clinically insignificant (9 mL). However, the differences between the measured TGV, Assessment 1 to Assessment 2 was beyond the acceptable variability for 38 (67.9%) of the 56 student-athletes.
Conclusions: Based on the results of the present study, caution should be advised to researchers and practitioners using only the predicted TGV or an isolated measured TGV to determine an athlete's body composition via the BOD POD, despite the clear logistical advantages. It may be advantageous to conduct multiple measured TGV before applying the value to the BOD POD assessment in order to provide the athlete with the most representative body composition values.
Clinical Assistant Professor of Nutrition
University of New Hampshire
Dover, New Hampshire