Affiliation: College of Arts and Sciences, Department of Exercise and Sport Science
The purpose of this study was to investigate muscle cross sectional area (mCSA) and echo intensity (EI) of the vastus lateralis (VL) and body composition of Division I football players. Sixty-nine players were stratified by position, race, year, and starter status. Muscle CSA and EI were determined from a B-mode ultrasound panoramic scan of the VL using Image-J software. Fat mass (FM), lean mass (LM), and body fat (%fat) were determined using dual-energy x-ray absorptiometry. Measures of mCSA (38.7±6.6 cm2, %fat (17.9±4.6 %), LM (81.3±11.8 kg), and FM (19.5±8.7 kg) were found to be significantly different across position (p<0.05), likely due to the differences in positionspecific tasks. Offensive and defensive linemen were not significantly different (p>0.05), and had the greatest mCSA (44.4 cm2), %fat (23.4%), LM (96.4 kg) and FM (30.9 kg) values in comparison to all other positions. No differences (p=0.161) were observed between positions for EI.