Air assault soldiers demonstrate more dangerous landing biomechanics when visual input is removed

Soldiers are subjected to increased risk of musculoskeletal injuries in night operations because of limited. visual input. The purpose of this study was to determine the effect of vision removal on lower extremity kinematics. and vertical ground reaction forces during two-legged drop landings. The researchers tested 139 Air Assault Soldiers. performing a landing task with and without vision. Removing visual input resulted in increased hip abduction at initial. contact, decreased maximum knee fl exion, and increased maximum vertical ground reaction force. Without vision, the. timing of maximum ankle dorsifl exion for the left leg was earlier than the right leg. The observed biomechanical changes. may be related to the increased risk of injury in night operations. Proper night landing techniques and supplemental training. should be integrated into Soldiers' training to induce musculoskeletal and biomechanical adaptations to compensate. for limited vision.