Spencer & Gastin 2001, energy system contribution in 200-1500 m running

Study in 20 highly trained track athletes (Med Sci Sports Exerc) using the accumulated oxygen deficit method during treadmill simulations of 200, 400, 800 and 1500 m. Aerobic share of total energy was 29% (200 m), 43% (400 m), 66% (800 m) and 84% (1500 m), so even the 800 m is aerobically dominated and the aerobic fraction rises steeply with distance.