After 2-3 months endurance training, individuals with high initial VO2 max typically show what percent increase?

• A. 50%
• B. 2%-3%
• C. 5%-20%
• D. 0%

Answer: (B)

When someone already has a high VO2 max, endurance training tends to produce only small gains after a couple of months. The typical improvement is about 2% to 3%. This modest change reflects a ceiling effect: with a high starting VO2 max, there’s less room for large central (heart and circulation) and peripheral (muscle) adaptations.

Very large increases, like 50%, are generally seen in people with low initial VO2 max who are starting from a relatively untrained state. Moderate gains in the range of 5%–20% are more common for beginners or during early training phases. A 0% change would imply no adaptation, which isn’t the case here. So, the best answer is a small, roughly 2%–3% increase.