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Related Experiment Video

Updated: Jul 17, 2026

Measurement of Spatial Stability in Precision Grip

Measurement of Spatial Stability in Precision Grip

Published on: June 4, 2020

Using the force-time curve to detect maximal grip strength effort.

Orit Shechtman¹, Bhagwant S Sindhu, Paul W Davenport

¹Department of Occupational Therapy, College of Public Health and Health Professions, University of Florida, Gainesville, FL 32610, USA. osechtm@php.ufl.edu

Journal of Hand Therapy : Official Journal of the American Society of Hand Therapists

|January 27, 2007

Summary

Detecting insincere effort in grip strength tests is challenging. This study found that force-time curve slopes effectively identify maximal effort, with different phases proving more accurate for men and women.

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Area of Science:

Biomechanics
Human Performance
Medical Diagnostics

Background:

Assessing maximal grip strength requires sincere effort from participants.
Current methods for detecting insincere effort lack universal acceptance.
Objective measures are needed to validate grip strength testing outcomes.

Purpose of the Study:

To evaluate the validity of force-time curve slopes in detecting insincere effort during grip strength testing.
To determine if different phases of the force-time curve offer distinct insights into effort sincerity.
To compare the effectiveness of force-time curve analysis between genders.

Main Methods:

Thirty healthy subjects performed maximal and submaximal grip strength trials.
Force-time data were collected, generating curves for each trial.
Slopes of the force-generation and force-decay phases were calculated and analyzed.
Sensitivity and specificity analyses were performed to assess diagnostic accuracy.

Main Results:

Both force-generation and force-decay slopes were significantly steeper during maximal efforts compared to submaximal efforts (p<0.0001).
The force-generation slope was more effective for women, while the force-decay slope was more effective for men in identifying sincerity of effort.
Specific cutoff values for the force-decay slope demonstrated high accuracy in correctly classifying men's effort levels.

Conclusions:

Force-time curve slopes are valid and effective tools for assessing sincerity of effort in grip strength testing among healthy individuals.
This novel approach using force-time curve slopes represents a significant step towards objective sincerity of effort assessment.
Further research is warranted to validate these findings in clinical populations, particularly those with hand injuries.