Årnes, Anders Pedersen; Krokstrand, Thomas Tysnes (Master thesis; Mastergradsoppgave, 2014-05-01)
Background: Musculoskeletal disorders (MSDs) appear relatively frequent and are costly for society each year, yet they are poorly understood. Four commonly occurring MSDs are Chronic Fatigue Syndrome (CFS), Back Pain (BP) of unknown origin, Fibromyalgia (FM), and muscle pain/Myalgia. There are few Norwegian epidemiologic data on these four outcomes. Physical activity (PA) has been internationally ...