TY - JOUR

T1 - Grip Work Measurement with the Jamar Dynamometer

T2 - Validation of a Simple Equation for Clinical Use

AU - de Dobbeleer, L.

AU - Beyer, I.

AU - Hansen, Å.M.

AU - Molbo, D.

AU - Mortensen, E. L.

AU - Lund, R.

AU - Bautmans, Ivan

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

KW - grip strength

KW - Grip work

KW - Jamar Dynamometer

KW - muscle fatigue

KW - validity

U2 - 10.1007/s12603-019-1155-4

DO - 10.1007/s12603-019-1155-4

M3 - Journal article

C2 - 30697635

AN - SCOPUS:85060599139

VL - 23

SP - 221

EP - 224

JO - Journal of Nutrition, Health and Aging

JF - Journal of Nutrition, Health and Aging

SN - 1279-7707

IS - 2

ER -