Trapezius Muscle Tone and Viscoelastic Properties in Sitting and Supine Positions

Ragnar Viir ； Ahti Virkus ； Kari Laiho ； Kristiina Rajaleid ； Anne Selart ； Marja Mikkelsson

《SJWEH Supplements》 3期 (2007/01) Pp. 76-80

並列摘要

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.

並列關鍵字

gravity ； muscle tone ； sitting ； support function ； workplace prevention