A metabolic cart in fitness testing is best used for what purpose?

• A. To check for diseased heart tissue
• B. To monitor an athlete's metabolism for energy expenditure
• C. To time an athlete for exactly one lap around a track
• D. To calculate the best heart rate zone for a swim

Answer: (B)

A metabolic cart measures gas exchange to determine energy expenditure. It analyzes oxygen consumed and carbon dioxide produced during exercise, using indirect calorimetry to calculate how many calories are burned and what fuels (carbohydrates or fats) are being used. This focus on metabolism and energy cost is exactly what the device provides in fitness testing. It isn’t used to diagnose diseased heart tissue, which would require medical imaging or tissue analysis. It isn’t a tool for timing a lap around a track. And while metabolic data can inform training, establishing heart rate zones for swimming is typically done with heart rate testing and zone calculations rather than the primary purpose of a metabolic cart.