Which energy system contributions are most relevant for a 200 m freestyle race?

• A. Primarily phosphagen energy with minimal glycolytic use
• B. Primarily aerobic with minimal anaerobic contribution
• C. Primarily anaerobic with significant glycolytic contribution and a substantial aerobic contribution, supported by initial phosphagen use at start and breakout
• D. Energy comes solely from lactic acid production

Answer: (C)

The race relies on multiple energy systems, with the dominant contribution coming from anaerobic glycolysis because the pace is very high and lasts well over a minute. This means a large portion of ATP comes from breaking down glucose without oxygen, which sustains the fast tempo but also leads to lactate accumulation as a byproduct. There is also a substantial aerobic contribution to support the effort over the distance, help with pacing, and provide energy as the race unfolds. The phosphagen system does provide a quick burst at the start and at the walls, but its capacity is limited, so it can’t power the entire race. So the best description is a strong anaerobic (glycolytic) drive with a meaningful aerobic support, plus initial phosphagen contribution at the outset.