Related Experiment Videos
Asymmetries in ground reaction force patterns in normal human gait
1Biomechanics Laboratory, Faculty of Physical Education, University of Calgary, Canada.
Medicine and Science in Sports and Exercise
|February 1, 1989
Summary
This study introduces a novel symmetry index for analyzing normal human gait, establishing reference ranges for 34 gait variables. Results highlight the need for careful interpretation of certain gait metrics.
Area of Science:
- Biomechanics
- Human Movement Analysis
- Gait Analysis
Background:
- Gait symmetry is crucial for efficient locomotion.
- Quantifying gait asymmetry aids in identifying potential movement disorders.
- Existing methods for gait analysis may lack comprehensive symmetry measures.
Purpose of the Study:
- To propose and validate a quantitative measure for normal human gait symmetry and asymmetry.
- To establish normative limits for gait symmetry indices across various gait variables.
- To assess the reliability of symmetry measurements using force platform data.
Main Methods:
- Sixty-two healthy subjects participated in the study.
- Each subject completed ten gait trials, with five trials per leg on a force platform.
- A symmetry index was calculated for 34 selected gait variables.
Main Results:
- Normative upper and lower limits were determined for gait symmetry indices, encompassing 95% of the subject population.
- Symmetry index limits varied significantly, ranging from +/- 4% to over +/- 13,000%.
- High variability was observed in variables with near-zero magnitudes or distinct timing within the gait cycle, requiring cautious interpretation.
Conclusions:
- The proposed symmetry index provides a valuable tool for quantifying human gait symmetry.
- Established normative limits aid in distinguishing normal gait variations from potential abnormalities.
- Careful consideration is needed when interpreting symmetry indices for specific gait variables, especially those with low magnitudes or variable timing.