Quantifying Human Gait Symmetry During Blindfolded Treadmill Walking.

Area of Science:

• Biomechanics
• Human movement analysis
• Sensory neuroscience

Background:

• Bilateral gait symmetry is vital for normal walking, as asymmetry elevates fall and injury risks.
• Sensory input significantly influences gait control, but its specific role in symmetry remains under investigation.

Purpose of the Study:

• To investigate the influence of vision, a dominant sensory system, on the production of symmetric gait.
• To quantify changes in gait symmetry parameters when visual input is removed.

Main Methods:

• Ten healthy adults walked on a treadmill under two conditions: with and without vision.
• Twenty-two gait parameters, including ground reaction forces, joint range of motion (ankle, knee, hip), stance, swing time, and step length, were analyzed.

Main Results:

• Blocking vision increased asymmetry in most ground reaction force parameters, primarily in the vertical component.
• Symmetry of ankle and knee range of motion decreased without vision, while hip joint symmetry remained unaffected.
• Stance and swing time symmetry were reduced when vision was blocked, but step length symmetry showed no significant difference.

Conclusions:

• The visual system plays a critical role in maintaining bilateral gait symmetry during walking.
• This research underscores the importance of vision in overall gait control and provides a foundation for studying visual deficits in pathological gaits.