Biomechanical foot function as expressed by the duration of successive ground contact phases and by dynamic variables, such as the peak pressure on different parts of the foot, their respective loading rate, and duration, is compared for two walking and running conditions: overground on a 20-m walkway and on a treadmill. Statistical analysis revealed foot pressure characteristics as measured with a Electrodynogram during walking and running to alter significantly when using a treadmill. The differences were more pronounced for walking than for running. During walking, loading of the forefoot tends to last longer (longer propulsion phase) on a treadmill. Loading rate is decreased for the whole foot during either walking or running. Maximum heel pressure is diminished for walking but increased during running on a treadmill. Moderate variations of treadmill velocity were shown to have no significant influence on the measurements.
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