Does an additional load modify the Anticipatory Postural Adjustments in gait initiation?

Area of Science:

• Biomechanics
• Human Movement Science
• Motor Control

Background:

• Gait initiation is a complex process involving anticipatory postural adjustments (APA).
• The effect of external loads on APA during gait initiation is not fully understood.
• Understanding these effects is crucial for rehabilitation and performance enhancement.

Purpose of the Study:

• To investigate the impact of a 15% body weight overload on APA during gait initiation in healthy adults.
• To determine how individuals modulate their APA in response to added load.
• To explore potential clinical applications of these findings.

Main Methods:

• Nineteen healthy participants performed gait initiation under unloaded and 15% body weight overload conditions.
• Key variables measured included APA duration, forward impulse, and gait initiation duration.
• Participants initiated gait at a self-selected speed.

Main Results:

• Overload significantly increased APA duration.
• A significant increase in forward impulse of the APA was observed with overload.
• Gait initiation duration also increased significantly under the overloaded condition.
• Other measured variables did not show significant changes.

Conclusions:

• Able-bodied individuals adapt APA duration to generate greater forward impulse when initiating gait with an overload.
• This adaptation helps achieve steady-state gait despite the added load.
• Findings suggest potential therapeutic benefits of overloading for improving gait initiation in patient populations.