A treadmill ergometer for three-dimensional ground reaction forces measurement during walking

Area of Science:

• Biomechanics
• Gait Analysis
• Human Locomotion

Background:

• Accurate measurement of ground reaction forces is crucial for understanding human gait mechanics.
• Existing methods may have limitations in capturing dynamic, multi-directional forces during walking.

Purpose of the Study:

• To introduce and validate a novel treadmill ergometer designed for measuring vertical and horizontal ground reaction forces.
• To assess the accuracy and reliability of the new treadmill ergometer for gait analysis.

Main Methods:

• Development of a treadmill ergometer capable of measuring left and right leg forces.
• Validation through static and dynamic testing, including non-linearity and resonance frequency assessments.
• Utilized a calibration leg system with an air jack and strain gauge for force signal comparison.

Main Results:

• The treadmill ergometer demonstrated low non-linearity (0.2% to 1.4%) and acceptable resonance frequencies.
• Calibration tests showed minimal mean differences between the ergometer and calibration leg (0.7% left, 1.2% right) at 5 km/h.
• Human walking trials confirmed the ergometer's ability to capture gait-related forces.

Conclusions:

• The developed treadmill ergometer is a valid and reliable tool for measuring ground reaction forces during walking.
• This device offers significant potential for advanced analysis of human gait.
• The findings support the use of this ergometer in biomechanical and clinical research settings.