Comparison of push/pull force estimates using a single-axis gauge versus a three-dimensional hand transducer

Area of Science:

• Biomechanics
• Ergonomics
• Human Factors Engineering

Background:

• Accurate measurement of push/pull forces is crucial for establishing ergonomic guidelines and understanding physical exertion.
• Existing methods for force measurement may vary in accuracy and applicability across different exertion types and conditions.

Purpose of the Study:

• To investigate the impact of a single-axis force gauge on kinetic and kinematic measures during push/pull exertions.
• To evaluate the agreement between force measurements obtained from a single-axis gauge and a three-dimensional hand transducer under various conditions.

Main Methods:

• The study compared force measurements from a single-axis gauge and a 3D hand transducer.
• Exertion types (push, pull, turn), test conditions (natural, force gauge at different paces), and cart weights (light, heavy) were varied.
• Intraclass correlations were used to assess agreement between technologies and conditions.

Main Results:

• Excellent agreement (ICC = 0.998) was found between the single-axis gauge and the 3D transducer.
• Peak forces measured with the single-axis gauge at a fast pace showed the best agreement (ICC = 0.631) with natural test conditions.
• Current standards may require faster initial acceleration and sustained velocity for accurate force approximation.

Conclusions:

• A single-axis force gauge is a reliable tool for measuring push/pull forces, demonstrating high agreement with a more complex 3D system.
• Optimizing exertion pace, specifically faster initial acceleration and sustained velocity, is recommended for force measurements to align with existing push/pull guidelines.
• Further research is needed to develop standardized methods for measuring turning forces.