PARCHMAN, Andrew J.*; REILLY, Stephen M.: Locomotion in a semi-erect mammal: Whole body mechanics and gait patterns in the Pygmy Opossum, Monodelphis Domestica

Most studies of locomotor mechanics have focussed on species utilizing erect postures that take advantage of energy saving mechanisms during walking (pendular exchange of kinetic and potential energies) and running (storing and recovering energy in tendonous springs in the limb). We studied ground reaction forces and gait patterns in the semi-erect pygmy opossum to examine the extent to which this semi-erect mammal takes advantage of these energy saving mechanisms. Foot fall (gait) patterns were related to patterns of mechanical energy fluctuation to examine how efficiently opossums mechanically walk and run compared to other mammals. In addition, the dynamics of changes in gait (kinematic definitions of walking and running based on foot fall patterns) and mechanics (mechanical definitions of walking and running) are compared as opossums increase speed.