J Phys Ther Sci. 2015 Jun;27(6):1719-22. doi: 10.1589/jpts.27.1719. Epub 2015 Jun 30.

Test-retest reliability of isometric shoulder muscle strength measurement with a handheld dynamometer and belt.

Journal of physical therapy science

Munenori Katoh

PMID: 26180305 PMCID: PMC4499968 DOI: 10.1589/jpts.27.1719

Abstract

[Purpose] The aim of this study was to develop a method of measuring isometric shoulder joint muscle strength using a handheld dynamometer with a belt and investigate its test-retest reliability. [Subjects] The subjects comprised 40 healthy adults. [Methods] Six types of isometric shoulder muscle strength were measured twice, and reliability was assessed. [Results] The intraclass correlation coefficient (1, 1) values ranged from 0.976 to 0.902. The result of a Bland-Altman analysis showed differences in the types of errors between measurement items. [Conclusion] The relative reliability of isometric shoulder muscle measurement using a handheld dynamometer with a belt was high. However, analysis of absolute reliability revealed errors that may affect interpretation of values; therefore, it was considered that adapting the greater of two measurement values is appropriate.

Keywords: Handheld dynamometer; Reliability; Shoulder muscle strength

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Publication Types

• Journal Article