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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.

Figure 4