The effect of virtual reality on gait variability

Area of Science:

• Biomechanics
• Human Locomotion
• Virtual Reality

Background:

• Optic flow (OF) is crucial for human locomotion and manipulation of its characteristics alters gait patterns.
• Understanding how visual cues influence gait variability is essential for rehabilitation strategies.

Purpose of the Study:

• To investigate the effect of optic flow velocity on the amount and structure of gait variability during treadmill walking.
• To compare linear and nonlinear measures of gait variability under different optic flow conditions.

Main Methods:

• Subjects walked on a treadmill under four conditions: a control and three virtual reality (VR) conditions with varying optic flow speeds (normal, faster, slower).
• Gait kinematics were captured using an optical motion system.
• Linear (coefficient of variation) and nonlinear (approximate entropy, detrended fluctuation analysis) measures of gait variability were analyzed for hip, knee, ankle, and stride interval.

Main Results:

• Nonlinear measures revealed significant differences in gait variability structure at the hip, ankle, and stride interval across optic flow conditions.
• The order of significant differences was: normal optic flow (OFn) > faster optic flow (OFf) > slower optic flow (OFs).
• Linear measures of variability amount showed no significant differences between conditions.

Conclusions:

• Measures of gait variability structure are more sensitive to visual cue manipulation than measures of variability amount.
• Altered optic flow increases gait complexity and may enhance motor control adaptability.
• Optic flow manipulation shows potential as a rehabilitation tool for sensorimotor disorders.