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Updated: Mar 24, 2026
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Measurement of Spatial Stability in Precision Grip
Published on: June 4, 2020
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Voluntary control of submaximal grip strength.
1School of Allied Health Sciences, University of Texas Medical Branch, Galveston 77550.
American Journal of Physical Medicine & Rehabilitation
|April 1, 1990
Summary
Normal subjects can convincingly feign grip weakness, challenging the reliability of hand dynamometer grip force measurements. Simple maximal grip tests may not detect these simulated submaximal efforts in clinical settings.
Area of Science:
- Orthopedics
- Neurology
- Occupational Medicine
Background:
- The Jamar hand dynamometer is used to assess grip strength.
- Stokes proposed that grip force patterns differentiate sincere from feigned efforts.
Purpose of the Study:
- To investigate normal subjects' control over submaximal grip efforts.
- To assess the ability to feign weakened grip strength.
Main Methods:
- Three experiments were conducted with normal subjects.
- Subjects performed maximal and submaximal grip efforts at various handle positions.
- Grip force data were analyzed for patterns.
Main Results:
- Submaximal efforts (30-90%) showed a linear relationship between effort level and grip force.
- Feigned efforts were indistinguishable from sincere efforts of injured individuals.
- Stokes' hypothesis was not supported by the findings.
Conclusions:
- Normal subjects can effectively simulate grip weakness.
- Maximal grip force measurements are insufficient for detecting feigned weakness.
- Rethinking diagnostic methods for grip strength assessment is needed.
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