Which activity primarily uses the Glycolytic Pathway?

• A. 100m sprint
• B. 400m sprint
• C. 2 km row
• D. 20-minute run

Answer: (B)

Glycolysis is the rapid, anaerobic breakdown of glucose to generate ATP during high‑intensity efforts when the phosphagen system is running out and before oxidative processes can fully take over. The 400-meter sprint typically lasts about 40–60 seconds, placing it in the zone where glycolysis becomes the main source of ATP. The body starts with the phosphagen system for immediate power, but as those stores deplete, glycolysis ramps up to sustain the effort, producing lactate in the process and supporting the higher power output needed for the duration.

The 100-meter sprint is so brief that the phosphagen system provides most of the ATP, with glycolysis contributing only a small amount. The 2-kilometer row and a 20-minute run are longer efforts that rely predominantly on oxidative metabolism (aerobic energy production) to sustain energy over several minutes, with glycolysis contributing as part of the overall energy mix but not the primary source.