Changes to the gait initiation programme following a running exercise in human subjects

Area of Science:

• Biomechanics
• Motor Control
• Human Movement Science

Background:

• Gait initiation is a complex motor task crucial for locomotion.
• Understanding how prior exercise affects gait initiation is important for rehabilitation and performance.

Purpose of the Study:

• To investigate whether the gait initiation program is invariant or modifiable after prolonged running exercise.
• To examine changes in temporal and spatial parameters of gait initiation post-running.

Main Methods:

• Eight subjects performed gait initiation on a force platform before and after a 3.3 m/s treadmill run.
• Measurements included step length, velocity, double stance duration, ankle joint moments, EMG activity, and center of foot pressure displacement.

Main Results:

• Post-running, subjects exhibited greater first step length and velocity, and shorter double stance duration.
• The relationship between temporal gait parameters and center of gravity velocity remained unchanged.
• Postural adjustments in the center of foot pressure displacement were observed, correlating with Tibialis Anterior EMG activity.

Conclusions:

• Prolonged running exercise modifies certain aspects of gait initiation, particularly the postural control mechanisms.
• The fundamental timing of gait initiation appears rigid and resistant to change after running.
• These findings suggest a recalibration of gravitational force control rather than a complete alteration of the gait initiation program.