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A COMMONLY USED PREDICTION EQUATION FOR DETERMINING ENERGY EXPENDITURE FROM HEART RATE IS NOT ACCURATE FOR EXERCISE ON ELLIPTICAL MACHINES

Abstract

A commonly used prediction equation for determining energy expenditure from heart rate was validated using the treadmill and cycle ergometer. This equation has not been validated using an elliptical as the mode of exercise. PURPOSE: The purpose of this study was to determine if a prediction equation for energy expenditure from heart rate is an acceptable predictor of energy expenditure on an elliptical machine. METHODS: Fourteen participants, ages 20-46, performed an exercise test using a commercially available elliptical machine. Exercise testing consisted of a 2-minute warm-up, followed by a 20-minute exercise test. Each participated completed the test using the same resistance setting and cadence. Oxygen uptake, heart rate, and rate of perceived exertion (RPE) were collected every 2-minutes during the test. Total actual energy expenditure was determined from oxygen uptake and compared with the total predicted kcals using the heart rate equation. Data was then analyzed using a paired t-test and a linear correlation. RESULTS: Results demonstrate that measured kcal (104±21) and predicted kcal (194±67) were significantly different (p = 0.0003). The linear regression indicated there was a strong relationship (r2 = 0.52) between actual and predicted EE. CONCLUSION: The same heart rate equation used to predict energy expenditure on treadmills and stationary bikes cannot be used to predict energy expenditure for exercise on an elliptical. However, the strong relationship between the two equations suggests that a prediction equation for energy expenditure on an elliptical could be developed with further investigation.

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