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Related Experiment Videos

Identification of feigned grip effort using isokinetic dynamometry.

Z Dvir1

  • 1Department of Physical Therapy, Sackler Faculty of Medicine, Tel Aviv University, 69978, Ramat Aviv, Israel. zdvir@post.tau.ac.il

Clinical Biomechanics (Bristol, Avon)
|October 16, 1999
PubMed
Summary
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Isokinetic dynamometry effectively identifies feigned grip strength by analyzing eccentric and concentric force ratios. This method distinguishes genuine weakness from malingering, aiding in medicolegal assessments.

Area of Science:

  • Kinesiology and Biomechanics
  • Musculoskeletal Research
  • Medical Diagnostics

Background:

  • Identifying feigned grip strength is challenging, with traditional methods often relying on isometric assessments.
  • Previous research suggests isokinetic dynamometry is effective for detecting feigned efforts in other muscle groups.

Purpose of the Study:

  • To evaluate the feasibility of using isokinetic dynamometry to detect submaximal grip strength.
  • To determine if isokinetic dynamometry can differentiate genuine grip weakness from feigned efforts.

Main Methods:

  • Maximal and feigned concentric and eccentric grip strength were measured at high and low contraction velocities.
  • Seventeen healthy women (aged 20-25) participated, with instructions to exert submaximal effort for feigned trials.

Related Experiment Videos

  • A parameter (DEC) was calculated as the difference between eccentric/concentric strength ratios at varying velocities.

    • Main Results:

    • Feigned grip efforts were identified with high effectiveness (P<0.0001) using the DEC parameter.
    • A multivariate model provided a confidence level for classifying grip weakness claims as genuine or insincere.
    • The study demonstrated the potential of isokinetic dynamometry in medicolegal contexts.

    Conclusions:

    • The inability to modulate eccentric and concentric force components during submaximal efforts appears to be a general neuromuscular characteristic.
    • Isokinetic dynamometry offers a powerful tool for quantifying muscle performance and has potential in differentiating genuine weakness from malingering in medicolegal cases.