Increased proportion of megafibers in chronically painful muscles

Lars L. Andersena, Charlotte Suettab, Jesper L. Andersenb, Michael Kjærb, Gisela Sjøgaardc

Abstract

Trapezius myalgia – chronic pain from the upper trapezius muscle – is frequent in female employees in monotonous stressful jobs, potentially due to chronic overload of type I muscle fibers. In this study, we investigated the intra-individual distribution of trapezius muscle fiber size, and hypothesized that females with myalgia [...]