[Determination of the anaerobic threshold by a noninvasive field in man]

The relationship between running velocity and heart rate has been determined in 320 runners. A deflection from the expected linearity of this relationship has been observed at sub-maximal running speeds. Deflection velocity and anaerobic threshold (established through blood lactate determination) were coincident in 10 runners, thus showing that the increase in running speed exceeding the augmentation in heart frequency above Vd depends on anaerobic ATP production.