In the Stage Assessment Run, which metric is used to calculate the results?

• A. Lactate concentration
• B. Body fat percentage
• C. Heart rate
• D. Muscle cross-sectional area

Answer: (C)

Heart rate is the metric used to calculate results in the Stage Assessment Run because it directly reflects the body's cardiovascular response to exercise intensity. It changes in real time as effort increases or decreases, allowing the assessment to quantify stage-by-stage effort, pacing, and recovery and then derive the overall result. Lactate concentration requires blood sampling and represents metabolic state rather than stage calculation, while body fat percentage and muscle cross-sectional area are static body measurements that do not inform how a run's stages are scored.