When does a gait transition occur during human locomotion?

Area of Science:

• Biomechanics
• Human Locomotion
• Gait Analysis

Background:

• Traditional assumptions posit abrupt gait transitions (walk-run, run-walk) at specific kinematic events.
• Empirical and theoretical evidence for these abrupt transitions is lacking.

Purpose of the Study:

• To investigate if gait transitions during human locomotion are abrupt events.
• To pinpoint the specific timing of gait transitions within a stride.

Main Methods:

• Comparison of hip vertical velocity and ankle angular velocity between constant speed and transition strides.
• Analysis of strides before, during, and after walk-run and run-walk transitions.

Main Results:

• Strides preceding transitions resembled the original gait; strides following resembled the new gait.
• The transition stride itself did not match typical walking or running patterns.
• Gait transitions were initiated around midstance but completed over one to two steps.

Conclusions:

• Gait transitions are not abrupt but gradual processes.
• Initiation occurs at midstance, with completion near the subsequent ipsilateral heel strike.
• The transition phase involves a distinct gait pattern, not resembling pure walking or running.