Which of the following equation is used to measure the resting metabolic rate in healthy individuals?

NIA - 29 January 2023

Applied Nutrition & Dietetics

Easy

Appeared in: NIA - 29 January 2023

Explanation

The Mifflin-St Jeor equation is the most current and evidence-based predictive formula for estimating Resting Metabolic Rate (RMR) in healthy adults.
It is recommended by the Academy of Nutrition and Dietetics as it has demonstrated higher accuracy compared to older equations.
The formula uses weight, height, and age, with different calculations for men and women to account for variations in body composition.
RMR represents the energy the body needs to perform its most basic functions like breathing, circulation, and cell production while at rest.

Option A: The Harris-Benedict equation is an older formula (from 1919) that is now considered less accurate. It often overestimates RMR in modern populations.
Option C: The Ramsay equation is unrelated to metabolism. It refers to the Ramsay Sedation Scale, a tool used to score a patient's level of sedation.
Option D: A TEE (Total Energy Expenditure) equation calculates the total daily calorie needs, which includes RMR plus energy for physical activity and digestion. It is not a formula to find RMR itself.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Predictive Equations for Resting Metabolic Rate (RMR) as background academic context rather than a clinical decision trigger.
Nurses and dietitians use RMR calculations as a baseline for creating individualized nutrition plans for weight management, weight gain, or maintenance.
Understanding a patient's energy needs is crucial in clinical settings to prevent malnutrition in hospitalized patients and support recovery.
What if the patient is critically ill and on a ventilator? In this case, predictive equations like Mifflin-St Jeor are less reliable. The gold standard for measuring energy expenditure would be indirect calorimetry, which analyzes oxygen consumption and carbon dioxide production.

How to Approach the Question

First, identify the key concept in the question: 'resting metabolic rate (RMR) in healthy individuals'.
Analyze the options to see which ones relate to metabolic calculation.
Eliminate options that are clearly unrelated. The 'Ramsay equation' is for sedation, not metabolism.
Differentiate between the remaining terms. 'TEE equation' is for total energy, which includes RMR but is not RMR itself.
Compare the two remaining RMR/BMR equations: Harris-Benedict and Mifflin-St Jeor. Recall or determine which is the more modern and accurate standard.
Select the Mifflin-St Jeor equation as it is the current, most accurate predictive formula recommended for healthy adults.

Concept Tested & Keywords

Qt0yLhNZsUh-ydbvLUwcOr

E6 Nutrition Monika Sharma 3e p. 75-77

E6 textbook of Applied Biochemistry and Nutrition & DieteticsHarbans Lal (pp 26-464 of 479) p. 257-259

E6 Textbook of Biochemistry for medical StudentsDM Vasudevan Part 2 — Subpart A (pp 1-239 of 478) p. 184-186