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Grip Work Measurement with the Jamar Dynamometer: Validation of a Simple Equation for Clinical Use.

L De Dobbeleer1, I Beyer, Å M Hansen

  • 1Prof. Dr. Ivan Bautmans, Gerontology department, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, B-1090 Brussels, Belgium, Tel: +3224774207;

The Journal of Nutrition, Health & Aging
|January 31, 2019
PubMed
Summary

A new equation accurately estimates grip work (GW) during sustained maximal handgrip contractions using a Jamar Dynamometer-like device. This validated method provides a reliable measure of muscle fatigability and work output in middle-aged adults.

Keywords:
Grip workJamar Dynamometergrip strengthmuscle fatiguevalidity

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Area of Science:

  • Geriatric medicine
  • Musculoskeletal health
  • Biomechanical engineering

Background:

  • Muscle fatigability assessment is crucial for understanding functional decline in aging populations.
  • Previous methods for measuring grip work (GW) required specialized equipment.
  • A validated, accessible method for estimating GW is needed for clinical applications.

Purpose of the Study:

  • To validate an equation for estimating grip work (GW) during sustained maximal handgrip contractions.
  • To assess the utility of a Jamar Dynamometer-like (JD) device for measuring grip strength (GS) decay.
  • To determine the reliability of GW estimation as a measure of muscle work output.

Main Methods:

  • A cross-sectional, explorative study enrolled 962 participants from the Copenhagen Aging and Midlife Biobank.
  • Grip strength (GS) was continuously recorded using a JD device during maximal handgrip contractions until GS dropped to 50% of maximum.
  • Grip work (GW) was calculated as the area under the force-time curve and compared to an estimated value (GWestimated = GSmax*0.75*FR).

Main Results:

  • An excellent correlation (R²=0.98, p<0.001) was observed between estimated and measured grip work.
  • The equation slightly overestimated GW by 6.04 kg*s, with a coefficient of variation method error of 6%.
  • The validated equation provides a precise estimation of muscle work output during grip efforts.

Conclusions:

  • GW estimation using a JD device is a valid parameter for assessing muscle work output during sustained maximal grip efforts in middle-aged adults.
  • This method shows promise as an outcome parameter in comprehensive geriatric assessments.
  • Further validation with commonly used geriatric instruments will enhance clinical implementation of GW estimation.