ABSTRACT
Increased knee flexion occurs post heel contact whilst carrying a heavy load. To establish the influence of knee orthotics that inhibit anterio-tibial displacement on changes induced by load carriage, ten military subjects were assessed under four conditions (Unloaded, 20kg load, 40kg load and 40kg load + orthotics). Ankle and knee flexion/extension angular displacements and velocities were derived. Ground reaction force data and peak force time parameters were derived. Force data were expressed as percentage of body weight. Significant differences were found in propulsive impulse, work and power; as well as vertical impulse, work and power. These were increased by knee orthotics. Knee flexion during load carriage was not reduced by orthotics (p>0.05). The possibility that orthotics assist in carrying heavier loads was not demonstrated while there was an increase in physiological cost.
