Which equation is not used for measuring Resting Metabolic Rate (RMR)?

The Fitzgerald Equation is not commonly referenced in the context of measuring Resting Metabolic Rate (RMR), making it the correct choice for this question.

On the other hand, the Mifflin St. Joer equation, Owen equation, and Harris-Benedict equation are widely recognized and utilized formulas for estimating RMR. The Mifflin St. Joer equation is favored in contemporary practice due to its accuracy in a wide range of populations. The Owen equation is notable for being one of the earlier equations and is often applied in clinical settings. The Harris-Benedict equation, which has been revised over time, has also played a significant role in determining caloric needs based on RMR.

Understanding these equations is essential as they provide healthcare and fitness professionals with methods to calculate an individual's metabolic needs, thus facilitating effective weight management and nutrition strategies.