A quantitative gait assessment method based on energy exchange analysis during walking: a normal gait study

Area of Science:

• Biomechanics
• Rehabilitation Engineering
• Human Movement Science

Background:

• Assessing rehabilitation progress in individuals with disabilities requires reliable gait analysis methods.
• Existing gait energy consumption methods may not fully capture optimal walking efficiency.
• A need exists for a simple, speed-independent index to evaluate gait quality.

Purpose of the Study:

• To propose and describe a novel method for gait efficiency assessment: the Gait Energy Efficiency Index (GEEI).
• To test the hypothesis that GEEI is high and invariant with gait speed during energetically optimal normal walking.
• To validate GEEI against established gait energy consumption assessment methods.

Main Methods:

• GEEI calculation based on the cross-correlation of normalized kinetic and potential energy of the center of mass (COM).
• Testing the method on twelve healthy subjects across three different walking speeds.
• Comparative analysis with five established gait energy consumption assessment techniques.

Main Results:

• The Gait Energy Efficiency Index (GEEI) was found to be consistently close to 1 in healthy subjects during normal walking.
• GEEI remained stable across all tested walking speeds, supporting the hypothesis.
• The results demonstrated GEEI's potential as a reliable indicator of normal walking efficiency.

Conclusions:

• The proposed Gait Energy Efficiency Index (GEEI) offers a robust and speed-independent measure for evaluating gait efficiency.
• GEEI shows promise as a valuable tool for monitoring rehabilitation progress in individuals with mobility impairments.
• This index provides a simple yet effective way to quantify energetically optimal walking patterns.