Characterization of speed adaptation while walking on an omnidirectional treadmill

Area of Science:

• Biomechanics
• Rehabilitation Technology
• Human Locomotion

Background:

• Conventional treadmills limit complex gait retraining due to fixed speed and direction.
• Omnidirectional treadmills offer potential for versatile locomotor training, mimicking overground movement.
• The similarity of omnidirectional treadmill gait to overground walking requires investigation.

Purpose of the Study:

• To compare spatiotemporal parameters, body kinematics, and lower limb muscle activation.
• To evaluate walking on an omnidirectional treadmill versus overground walking.
• To assess the influence of virtual reality (VR) on omnidirectional treadmill walking.

Main Methods:

• 12 healthy young individuals (18-29 years) participated.
• Walking trials were conducted on an omnidirectional treadmill (with/without VR) and overground.
• Data collected included spatiotemporal parameters, kinematics, and muscle activation.

Main Results:

• Participants walked slower on the treadmill than overground.
• Treadmill overground walking involved increased cadence only, unlike overground's cadence and step length increase.
• Matched-speed walking showed altered knee flexion, ankle plantarflexion, and hip extensor activation on the treadmill.

Conclusions:

• Omnidirectional treadmills produce different walking patterns and speed adaptations compared to overground.
• Altered gait may result from reduced shear forces and perceived balance threats.
• Further research is needed on long-term effects for rehabilitation and gaming applications.