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Metabolic Factors Limiting Performance in Marathon Runners
Figure 4
Estimating the aerobic capacity of a typical runner.
Computed approximations of 
(in terms of milliliters of oxygen per minute per kilogram body mass), as a function of estimated fraction of maximum heart rate while running at a given speed, are shown as a set of colored curves. Each line corresponds to a particular running speed (Orange, 4 mph (
); Light Green, 5 mph (
); Green, 6 mph (
); Dark Green, 7 mph (
); Light Blue, 8 mph (
); Blue, 9 mph (
); Dark Blue, 10 mph (
); Purple, 11 mph (
); Magenta, 12 mph (
); Red, 13 mph (
)). See the text for a detailed explanation.
doi: https://doi.org/10.1371/journal.pcbi.1000960.g004