PERCENTAGE OF VO2max USED IN ENDURANCE EVENTS
Noakes, T. (1986). Lore of running. Cape Town, South Africa: Oxford University Press. (p. 40).
The longer the run, the less the percentage of VO2max that can be sustained. In a marathon it is roughly 85%, in a double marathon 75%, and in a 24-hour race it is 45%.
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