Which pie chart best represents the relative contribution of the the three ATP-generating energy systems (ATP-CP, glycolysis, & aerobic energy) during a maximal-effort 400-meter sprint lasting ~45 seconds?

• A.
• B.
• C.
• D.

Answer: (A)

Verified step by step guidance

1. Understand the energy systems involved in a 400-meter sprint lasting ~45 seconds: ATP-CP (adenosine triphosphate-creatine phosphate), glycolysis, and aerobic energy. Each system contributes differently based on the duration and intensity of the activity.
2. Recall that a 400-meter sprint is a high-intensity activity lasting less than a minute. The ATP-CP system provides immediate energy for the first few seconds, glycolysis takes over for short-term energy, and aerobic energy contributes minimally due to the short duration.
3. Analyze the pie charts provided. Look for the chart that shows a significant contribution from glycolysis, a moderate contribution from ATP-CP, and a smaller contribution from aerobic energy.
4. Match the color-coded legend (blue for ATP-CP, purple for glycolysis, and red for aerobic energy) to the sections of the pie charts. Identify the chart where glycolysis (purple) occupies the largest portion, followed by ATP-CP (blue), and a smaller portion for aerobic energy (red).
5. Select the pie chart that best represents the relative contributions of the three energy systems during a maximal-effort 400-meter sprint lasting ~45 seconds, based on the analysis of energy system contributions and the chart proportions.