Related Experiment Video
Updated: Mar 17, 2026

A Real-World High-Intensity Interval Training Protocol for Cardiorespiratory Fitness Improvement
Published on: February 22, 2022
Training for Aerobic Capacity and Running Economy
Abstract:
In brief: Successful long-distance running is often attributed to a high VO2 max, but running economy-the steady-state oxygen consumption at a given speed-may be more important. The physiological changes in a 31-year-old elite runner were studied during an 18-week training program using both interval and endurance running. Most improvements in running economy were noted during or immediately after weeks of increased interval training. Among runners of similar ability, a small difference in economy can make a large difference in finishing time in races longer than 10,000 meters.
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