Strain Gauge Attachment for Isometric Muscle Strength Measurement
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Solution Overview
Problem
Current systems for measuring isometric and dynamic muscle strength when a limb is fixed are expensive, complex, and limited in scope, making them unsuitable for comprehensive assessment in sports training and rehabilitation.
Innovation Solution
An apparatus comprising an attachment assembly for securing to exercise equipment, a strain gauge for measuring forces, and a connection assembly with pivotable clamping members to immobilize exercise equipment components, allowing for isometric and dynamic muscle contractions to be measured using a strain gauge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If elaborate custom-made assemblies and systems are used to measure isometric muscle strength, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The measurement system is divided into separate functional modules: a strain gauge sensor module, a connection assembly with clamping members, and an attachment assembly. Each module can be independently manufactured, calibrated, and replaced, reducing overall system complexity while maintaining measurement precision.
Solution Approach 2:
The connection assembly with pivotable clamping members and the attachment assembly are designed to be universally compatible with various exercise equipment types (barbells, resistance bands, weight machines). This multi-functionality eliminates the need for custom-made systems for each exercise type, reducing device complexity and manufacturing cost.
2Measurement precision
If custom-made elaborate assemblies are used for measuring isometric strength, then measurement accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The system is segmented into standardised components that can be manufactured using conventional processes. The strain gauge is a commercial off-the-shelf component, while the connection and attachment assemblies use standard mechanical parts, significantly reducing manufacturing cost compared to custom-made elaborate systems.
Solution Approach 2:
The connection assembly design uses replicated standard components (clamping members, pivots, latches) that can be mass-produced. Instead of custom-making elaborate systems, the invention copies proven mechanical connection designs that are already manufactured at scale in other applications.
3Measurement precision
If fixed-purpose systems are used for isometric strength measurement, then measurement precision for specific exercises is improved, but adaptability to different exercises and equipment decreases
Solution Approach 1:
The connection assembly with pivotable clamping members can attach to various exercise equipment components (barbells, racks, resistance bands). The attachment assembly can be mounted on different support frames, enabling the same strain gauge system to measure isometric strength across multiple exercise types and equipment, greatly enhancing adaptability.
Solution Approach 2:
The connection assembly incorporates pivotable clamping members that can dynamically adjust to different equipment geometries and orientations. This dynamic adaptability allows the system to maintain proper alignment and measurement accuracy across various exercises without requiring fixed-purpose configurations.
4Measurement precision
If elaborate custom-made systems are used for isometric strength measurement, then measurement capability is improved, but ease of operation decreases
Solution Approach 1:
The system is segmented into pre-assembled modules (strain gauge with connection assembly, attachment assembly) that can be quickly attached and detached without requiring complex setup procedures. This modular approach simplifies operation compared to elaborate custom-made systems that require extensive assembly and calibration.
Solution Approach 2:
The connection assembly includes self-aligning pivotable clamping members and a latch mechanism that automatically secures the strain gauge to the exercise equipment. This self-service design reduces the skill level and time required for setup, improving ease of operation while maintaining measurement precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The apparatus provides a cost-effective, versatile means to accurately measure isometric and dynamic muscle strength, suitable for various exercises and rehabilitation purposes, with the ability to connect to different types of exercise equipment without modification.
Implementation Method 1
a strain gauge (14) configured to measure compressive or tensional forces
Data Source
AI summary
An apparatus for measuring isometric muscle strength and dynamic strength when a limb is fixed, wherein the apparatus comprises: an attachment assembly for releasably attaching the apparatus to a support frame of an item of exercise equipment; a strain gauge configured to measure compressive or tensional forces; and a connection assembly for releasably connecting the strain gauge to a moveable component (e.g. barbell) of the exercise equipment wherein when connected makes the component immoveable such that forces exerted on the formerly moveable component require isometric muscle contraction or dynamic contraction while the limb is fixed that can be measured by the strain gauge.