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Test rig and software for recording force and muscle activity

A G Outten¹, G Cullen, M J Stokes

¹Royal Hospital for Neuro-disability, Putney, London, UK.

Clinical Rehabilitation

|October 31, 1998

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Researchers developed an affordable, portable test rig and software for measuring isometric quadriceps force. This system provides real-time feedback and analysis for maximal voluntary contraction (MVC) and electromyography (EMG) data.

Area of Science:

Biomechanics
Rehabilitation Engineering
Human Movement Science

Background:

Accurate measurement of isometric muscle force is crucial for rehabilitation research and clinical assessments.
Existing systems for measuring quadriceps force can be expensive, bulky, and difficult to transport.
There is a need for accessible, user-friendly equipment for evaluating muscle strength and neuromuscular function.

Purpose of the Study:

To design and develop a cost-effective, adjustable, and portable test rig for isometric quadriceps force measurement.
To create user-friendly data acquisition software for real-time force feedback, maximal voluntary contraction (MVC) analysis, and electromyographic (EMG) signal recording.
To provide a versatile tool for rehabilitation research and clinical muscle testing.

Main Methods:

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Construction of a test rig using an adjustable aluminum tubing system, designed for easy assembly and flat-packing.
Development of data acquisition software using Borland C++ for IBM-compatible PCs, featuring a user-friendly interface.
Integration of force sensors and capability for acquiring additional physiological signals like EMG.

Main Results:

The developed test rig is adjustable, dismountable, transportable, and relatively lightweight.
The data acquisition software provides real-time force feedback, automatic MVC analysis, and displays submaximal target levels.
The system is significantly less expensive than comparable commercial systems.

Conclusions:

The designed test rig and software offer a suitable, cost-effective solution for isometric quadriceps force measurement.
The equipment is versatile for various applications in rehabilitation research and clinical settings, including testing different muscle groups.
The system facilitates objective assessment of muscle function and can be used in conjunction with EMG for comprehensive analysis.