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REPEATABILITY OF TRAPEZIUS MUSCLE TONE ASSESSMENT BY A MYOMETRIC METHOD

RAGNAR VIIR

Ragnar Viir Ky, Latokartanontie 7 A, FIN-00700 Helsinki, Finland

Rheumatism Foundation Hospital, Pikijärventie 1, FIN-18120 Heinola, Finland

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KARI LAIHO

Rheumatism Foundation Hospital, Pikijärventie 1, FIN-18120 Heinola, Finland

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JEVGENIJ KRAMARENKO

Rheumatism Foundation Hospital, Pikijärventie 1, FIN-18120 Heinola, Finland

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, and

MARJA MIKKELSSON

Rheumatism Foundation Hospital, Pikijärventie 1, FIN-18120 Heinola, Finland

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https://doi.org/10.1142/S0219519406001856Cited by:61 (Source: Crossref)

Abstract

The goal of this paper is to examine the trapezius muscle tone by measuring simultaneously using Myoton-2 myometer i.e., the natural oscillation frequency, stiffness and the elasticity of the trapezius muscle. With this method, the mechanical response of the muscle, to a short applied mechanical impulse, is registered by an acceleration probe. From the acquired damped natural oscillation waveform, the frequency (Hz), the stiffness (N/m) and the logarithmic decrement of damping (characterizing tissue's elasticity) are calculated, quantifying the functional state of the muscle. The trapezius muscle on both sides of the body was tested in twenty adult women by two investigators using the Myoton-2 myometer. During the measurements, the subjects were in a relaxed sitting position. The Bland and Altman graphical test, comparing the differences of the measurements of two investigators, was used for assessing the inter-observer repeatability. The registered values for the trapezius muscle tension, stiffness and elasticity are varying between the tested subjects, but the intra-class correlation coefficient (ICC) was near 1 for three muscular properties, showing that the variation within the subject (due to the investigator) is negligible, compared with the variation between the subjects.

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