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Trapezius muscle tone and viscoelastic properties in sitting and supine positions

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Author(s): Ragnar Viir | Ahti Virkus | Kari Laiho | Kristiina Rajaleid | Anne Selart | Marja Mikkelsson

Journal: SJWEH Supplements
ISSN 1795-9926

Issue: 3;
Start page: 76;
Date: 2007;
Original page

Keywords: trapezius muscle | support function | workplace prevention | trapezius muscle tone | viscoelastic property | sitting position | supine position | muscle | gravity | prevention | muscle tone | workplace | sitting

ABSTRACT
OBJECTIVES: In this study, the aim was to use the upper trapezius muscle as a representative of the musculoskeletal support system to determine the effect of changing from a sitting position to a lying position on muscle tension and whether this change could be useful in the prevention of musculoskeletal complaints. METHODS: Fifteen healthy right-handed female computer operators participated in this study. Myometric measurements of the upper trapezius muscle on both sides of the body were recorded for the participants while they were in a sitting position and then again in a supine position. RESULTS: Changing from a sitting position to a supine position reduced the tone and stiffness by up to one-fifth—important characteristics of the support function—in the upper trapezius muscle. CONCLUSIONS: The change in the tone and stiffness of the trapezius muscle is of significance to the well-being of sedentary workers, particularly computer-terminal operators. Including recommended regular breaks of brief periods of simple, unchallenging movements while in a supine position should enhance their recovery from prolonged sitting because the support requirement on the muscles is lessened.
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