SMU Locomotor Performance Laboratory Test (IMAGE) Southern Methodist University Caption Dr. Lindsay Ludlow assists Dr. Takeshi Fujii in a treadmill test that captures volume of oxygen, volume of expired air and the levels of oxygen and carbon dioxide, all variables that help measure energy expenditure during walking. Credit Hillsman Jackson, SMU Usage Restrictions Please credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.