INTRODUCTION Fatigue resistance (FR) can be assessed as the time during which grip strength (GS) drops to 50% of its maximum during a sustained maximal voluntary contraction. For the first time we compared force-time characteristics during FR test between two different handgrip systems, and investigated age- and clinical-related differences in order to verify if a briefer test protocol (i.e. until 75%) could be sufficiently informative. METHODS A cohort of young healthy (Y, <30y, 24±3y, 54% women), middle-aged (MA, 30-65y, 47±11y, 54% women) and older (OLD, >65y, 77±7y, 50% women) community-dwelling persons, and hospitalized patients (HOSP, 84±5y, 50% women) performed the FR test. For this purpose, an adapted Vigorimeter (original rubber bulb of the Martin Vigorimeter connected to a Unik 5000 pressure gauge) here defined as "pneumatic handgrip system" (Pneu) and Dynamometer G200 system (original Jamar Dynamometer handle with an in-build strength gauge) here defined as "hydraulic handgrip system" (Hydr) were used. Force-time curves were analysed from 100%-75% and from 75%-50% of the initial maximal GS during the FR test. The area under the curve (GW) was calculated by integrating the actual GS at each time interval (i.e. 1/5000s) and corrected for body weight (GW/body weight). RESULTS For both systems we found fair associations between FR100-50 and FR100-75 (Pneu mean difference=50.1s (95%CI:47.9-52.4), r2=0.48; Hydr mean difference=28.4s (95%CI:27.0-29.7), r2=0.52, all p<0.001), and also moderate associations between GW(100-50)/body weight and GW(100-75)/body weight (Pneu mean difference=32.1kPa*s/kg (95%CI:30.6-33.6), r2=0.72; Hydr mean difference = 8.1kg*s/kg (95%CI:7.7-8.6), r2 = 0.68, all p<0.001). Between MA and OLD we found a significant age-related difference in the GW results in the first 25% strength decay for Pneu (respectively 10.2±0.6kPa*s/kg against 7.1±1.2kPa*s/kg). DISCUSSION/CONCLUSION The brief test protocol is valid. Differences within the first 25% strength decay in GW between OLD and HOSP were identified when using Pneu, but not when using Hydr. Therefore, a brief FR test protocol using a continuous registration of the strength decay seems to be sufficiently informative in a clinical setting to appraise muscle fatigability, however, only when using a Pneu system.

Originele taal-2English
Pagina's (van-tot)1259-1268
Aantal pagina's10
Nummer van het tijdschrift10
Vroegere onlinedatum5 jun 2023
StatusPublished - 1 okt 2023


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