1. What is Resting Energy Expenditure?

Resting Energy Expenditure (REE) represents the amount of energy required to maintain basic physiological functions at rest. It accounts for approximately 60-75% of total daily energy expenditure and is influenced by factors such as body composition, age, and gender.

2. How Does the Calculator Work?

The calculator uses the REE equation:

Where:

• \( weight \) — Body weight in kilograms (kg)
• \( height \) — Height in centimeters (cm)
• \( age \) — Age in years
• \( s \) — Gender-specific constant (typically +5 for males, -161 for females)

Explanation: This equation estimates the basal metabolic rate by accounting for body size, age, and gender differences in metabolic rate.

3. Importance of REE Calculation

Details: Accurate REE estimation is crucial for determining caloric needs in clinical nutrition, weight management programs, athletic training, and medical conditions requiring precise energy prescription.

4. Using the Calculator

Tips: Enter weight in kilograms, height in centimeters, age in years, and the appropriate s factor. Ensure all values are valid (weight > 0, height > 0, age between 1-120).

5. Frequently Asked Questions (FAQ)

Q1: What are typical s factor values?
A: For males: +5, for females: -161. These values account for gender differences in body composition and metabolic rate.

Q2: How accurate is this equation?
A: This provides a reasonable estimate for most healthy adults, but individual variations can occur due to factors like body composition, thyroid function, and genetic factors.

Q3: When should REE be measured instead of calculated?
A: Direct measurement (indirect calorimetry) is recommended for critically ill patients, those with abnormal body composition, or when precise energy needs are required.

Q4: Does this account for activity level?
A: No, this calculates only resting energy expenditure. Total daily energy expenditure requires multiplying REE by an activity factor.

Q5: Can this be used for children?
A: This specific equation is designed for adults. Pediatric equations should be used for children and adolescents.