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

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L. de Dobbeleer, I. Beyer, Å.M. Hansen, D. Molbo, E. L. Mortensen, R. Lund, Ivan Bautmans

Objectives: Previously, we developed and validated an easy test to measure muscle fatigability during sustained maximal handgrip contraction in older persons using a Martin Vigorimeter device. This study aimed at validating the equation to estimate grip work (GW) during sustained maximal handgrip contraction, by monitoring continuously the grip strength (GS) decay using a Jamar Dynamometer-like (JD) device. Design: Cross sectional, explorative study. Setting: Data collection took place at The National Research Centre for the Working Environment in Copenhagen, Denmark. Participants: 962 subjects, belonging to a subgroup of the Copenhagen Aging and Midlife Biobank, were enrolled. Methods: GS was recorded continuously during sustained maximal contraction until it dropped to 50% of its maximum and fatigue resistance (FR, time to fatigue) was noted. GW, area under the force-time curve, was compared to its estimate which was calculated as GWestimated=GSmax*0.75*FR. Results: Excellent correlation was found between GWestimated and GWmeasured (R2=0.98 p<0.001). The equation slightly overestimated GW by 6.04 kg*s (95% CI[-0.08, 12.15]) with a coefficient of variation method error of 6%. Conclusion: GW estimation is a valid parameter reflecting muscle work output during a sustained maximal grip effort in healthy middle-aged community-dwelling persons when using a JD. GW estimation is a promising outcome parameter in comprehensive geriatric assessment and its validation for commonly used instruments in geriatric practice will increase its clinical implementation.

Original languageEnglish
JournalJournal of Nutrition, Health and Aging
Volume23
Issue number2
Pages (from-to)221-224
Number of pages4
ISSN1279-7707
DOIs
Publication statusPublished - 2019

    Research areas

  • grip strength, Grip work, Jamar Dynamometer, muscle fatigue, validity

ID: 212847789