Otago Polytechnic

Dynamometer Design

Matt King




This paper considers why and how grip strength is measured and establishes a baseline of physical design parameters which will allow for the development of a handgrip dynamometer which generates consistent and accurate results.


Relevant publications were reviewed and evaluated to glean insight into the effects of various device design considerations on the test outcomes. Additionally, an investigation into the mechanism which provides grip strength for humans was used to inform appropriate data collection techniques.


A variety of Dynamometers have been made available on the market with mixed reviews on the consistency of the results, due in part to a lack of understanding of physics and the inconsistent selection of design parameters. A number of physical parameters were consistently reported as having a negative effect on the reliability of the test results. The following physical aspects were considered to inform the design parameters for handgrip strength dynamometers in this paper: Physical characteristics of chosen test Device, Anthropometrics, Test Protocols, Device feedback, shape of handle, material, dimensions, weight and application.


Test results revealed inconsistent medical examination outcomes. Dynamometer design parameters have been clarified to generate a more standardised outcome from hand grip tests. Recommended design parameters and protocols have been specified to guide future dynamometer development.


Index Terms:

Dynamometer, Grip Strength, Jamar, Test protocol, Hand Grip Strength Testing.



Supporting documentation