Stability Strategy Restrictions Do Not Elicit Compensatory Mechanisms During Mediolaterally Perturbed Slow Walking

Area of Science:

• Biomechanics
• Human locomotion
• Robotics

Background:

• Humans possess multiple balance strategies to maintain stability during walking.
• It is unclear how these strategies interact when one is experimentally limited.

Purpose of the Study:

• To investigate compensatory mechanisms between different balance strategies during mediolateral perturbations.
• To determine if limiting one strategy influences the use of others in healthy individuals.

Main Methods:

• Human experiments involved restricting stepping, ankle, or trunk strategies during perturbations.
• Computational modeling simulated the removal of individual balance strategies.
• Gait responses and compensatory behaviors were measured in both approaches.

Main Results:

• Human experiments showed no compensatory behavior when a balance strategy was limited.
• Computational models demonstrated compensatory behavior when strategies were removed.
• A discrepancy exists between human experimental findings and simulation results.

Conclusions:

• Compensatory balance strategies may offer benefits but are not employed by healthy humans.
• The mismatch suggests human gait control involves multiple objectives beyond just forward progression.