A line-matching test was given to 14 subjects while exercising on a motor-driven treadmill. The speed and accuracy of each subject were recorded for 4 3-min. stages of exercise: Stage 1, 2.5 mph at 12% grade; Stage 2, 3.4 mph at 14% grade; Stage 3, 4.2 mph at 16% grade; Stage 4, 5.0 mph at 18% grade. Heart rate was recorded for each subject continuously throughout the test. Increased levels of concomitant exercise produced significantly increased speed of mental performance but had no significant effect on accuracy. The speed of response dropped significantly after the termination of exercise (posttest).
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