title: Interactive effects of acute experimental pain in trapezius and sored wrist extensor on the electromyography of the forearm muscles during computer work.
abstract: We investigated the interactive effects of shoulder pain and wrist extensor muscle soreness on surface electromyography (EMG) during computer mouse work. On day one, subjects (N = 12) performed computer work with/without acute muscle pain induced in the trapezius muscle. Subsequently, eccentric exercise was performed to induce delayed onset muscle soreness (DOMS) in wrist extensor muscles. In presence of DOMS on day two, computer work recordings with/without pain were repeated. EMG signals were recorded from the descending part of trapezius bilaterally, flexor carpi ulnaris and extensor carpi radialis brevis. Experimental muscle pain in trapezius led to a decrease in the muscular activity of the wrist extensor (P < 0.02) and decreased the relative rest time in the wrist flexor even in presence of DOMS (P < 0.01). The present result suggests that shoulder pain plays a role in the coordination of wrist flexors and extensors during computer work.
authors.affiliation: Laboratory for Ergonomics and Work-related Disorders, Center for Sensory-Motor Interaction, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7 D-3, Aalborg East, Denmark.
authors.forename: Afshin
authors.initials: A
authors.lastname: Samani
authors.forename: Josué
authors.initials: J
authors.lastname: Fernández-Carnero
authors.forename: Lars
authors.initials: L
authors.lastname: Arendt-Nielsen
authors.forename: Pascal
authors.initials: P
authors.lastname: Madeleine
mesh_terms: D000208:Acute Disease; D016287:Computer Peripherals; D004576:Electromyography / Q000295:instrumentation* / Q000379:methods; D006804:Ergonomics; D005542:Forearm / Q000502:physiology*; D006801:Humans; D008297:Male; D008962:Models, Theoretical; D009119:Muscle Contraction / Q000502:physiology; D018482:Muscle, Skeletal; D011187:Posture; D020069:Shoulder Pain / Q000209:etiology* / Q000517:prevention & control; D013716:Tennis Elbow / Q000209:etiology / Q000517:prevention & control; D013997:Time Factors; D014584:User-Computer Interface; D014953:Wrist / Q000502:physiology*; D055815:Young Adult