1. What is Energy Availability?

Energy Availability (EA) represents the amount of dietary energy remaining for physiological functions after accounting for exercise energy expenditure, relative to fat-free mass. It's a key concept in sports nutrition and athlete health monitoring.

2. How Does the Calculator Work?

The calculator uses the Energy Availability equation:

Where:

• \( EI \) — Energy Intake (kcal/day)
• \( EEE \) — Exercise Energy Expenditure (kcal/day)
• \( FFM \) — Fat-Free Mass (kg)

Explanation: The equation calculates the energy available for bodily functions after exercise energy expenditure is subtracted from total energy intake, normalized to fat-free mass.

3. Importance of Energy Availability Calculation

Details: Monitoring EA is crucial for athletes to ensure they have sufficient energy for both performance and health. Low EA (<30 kcal/kg FFM/day) can lead to impaired physiological function.

4. Using the Calculator

Tips: Enter energy intake in kcal/day, exercise energy expenditure in kcal/day, and fat-free mass in kg. All values must be valid (FFM > 0).

5. Frequently Asked Questions (FAQ)

Q1: What is a healthy Energy Availability range?
A: Generally, >45 kcal/kg FFM/day is optimal for most athletes, while <30 may indicate risk for Relative Energy Deficiency in Sport (RED-S).

Q2: How is fat-free mass measured?
A: FFM can be measured via DEXA, BIA, or skinfold measurements. For most practical purposes, BIA provides reasonable estimates.

Q3: What's included in Exercise Energy Expenditure?
A: EEE includes all planned exercise and sports activities, but not general daily activities or NEAT (non-exercise activity thermogenesis).

Q4: Are there limitations to this calculation?
A: Accuracy depends on precise measurement of all components. Self-reported EI and EEE often underestimate true values.

Q5: How often should EA be monitored?
A: For at-risk athletes, weekly monitoring may be appropriate during intensive training periods. For others, periodic assessment is sufficient.