Accuracy and Reliability of Grip Strength Measurements: A Comparative Device Analysis

Overview

Journal J Funct Morphol Kinesiol

Date 2024 Dec 27

PMID 39728258

Authors

Pascale Granicher

Yael Maurer

Jorg Sporri

Bernhard Haller

Jaap Swanenburg

Rob A de Bie

Ton A F Lenssen

Johannes Scherr

Affiliations

Soon will be listed here.

Abstract

Grip strength is widely used as a surrogate parameter for functional status. The current gold standard, the JAMAR Hydraulic Dynamometer (JAMAR Hydraulic), presents challenges for individuals with painful finger joints or low grip strength. Therefore, the objective of this observational study was to assess comparability across the JAMAR Smart, the Martin Vigorimeter and the gold standard. Additionally, the intrasubject and intersession reliability of all three devices were examined, which are essential for quality control before generating normative data. Forty healthy participants (aged 37.0 ± 11.3 years) were included, and a subset of 20 participants was randomly selected for retesting. Grip strength testing involved five attempts per measurement device. Intrasubject reliability was excellent (ICC3,1: 0.91-0.97), and a strong correlation (ICC3,1: 0.90-0.98) was found between the first attempt and the best of five as well as between the best of two or three attempts and the best of five, demonstrating robust reliability across multiple measures. Intersession reliability was good to excellent (ICC3,1: 0.85-0.97) across all three devices, which was confirmed by Bland-Altman analysis. The PCC (r) revealed moderate to very strong agreement with the current gold standard JAMAR Hydraulic (r = 0.68-0.98), with increased differences between the Martin Vigorimeter and the JAMAR Hydraulic measurements, particularly at low and high values. The proposed devices are suitable for test-retest analysis with 2-3 attempts. Despite high correlations between all three devices, the diverging levels of agreement between the Martin Vigorimeter and the established gold standard warrant caution against using these devices interchangeably.

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