Fifteen persons whose running averaged >25 miles per week or more for the past four months were compared, to 16 persons jogging less than four miles per week for the same period of time. These two groups were filmed running on a treadmill at 6.0, 7.5, and 9.0 mph. Preselected segments of tape were then analyzed by using the Peak5™ motion analysis system. Between the two groups no statistical significance was demonstrated in either the amount of vertical displacement or knee flexion angle at heel strike. Statistically significant differences were found for both groups in knee flexion at heel strike angles between the three speeds. For the runner group the angle increased significantly between 6.0 mph to 7.5 mph (from 11.480 to 13.34°p=.001) and from 7.5 mph to 9.0 mph (13.34° to 14.21°p=.001). For the non-runner group the change was significant only between 6.0 and 9.0 mph (8.99° to 1l.2Sop=.001). Vertical displacement decreased significantly between all three speeds for the runners (7.2, 6.5 and 5.7 cm, respectively p=.0001). For the non-runner group statistical significance was only found when comparing the difference in vertical displacement between 6.0 and 9.0 mph (7.3 and 6.3 cm respectively p=.0001).
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