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Although it is generally accepted that the caloric expenditure estimates obtained from exercise equipment are not accurate, there is little research regarding the magnitude of the difference in the estimates compared to indirect calorimetry, how the difference changes over time during steady state exercise, and if the differences are greater for males or females. It would benefit both the exercise science professional and the layperson to have a general idea of how much one could expect these numbers to differ as there are many people trying to balance energy expenditure and caloric intake. There are established equations for estimating caloric expenditure for both overground and treadmill walking and running [1], but the information available for elliptical machines is limited. As the elliptical trainer is a popular, low-impact option [2] for cardiovascular exercise, it is important to have a better understanding of the discrepancy between caloric expenditure as measured by indirect calorimetry versus the estimate generated by the equipment’s internal programmed algorithms. The elliptical has been identified as a positive method of exercise for multiple reasons. The elliptical has a lower Rating of Perceived Exertion (RPE) than is indicated by physiological response [3] which makes the exercise “feel” easier. It also has been found to provide the same cardiovascular training stimulus as the treadmill while resulting Research Article Exercise Medicine Open Access eISSN: 2508-9056

Caloric Expenditure Estimation Differences between an Elliptical Machine and Indirect Calorimetry