Abstract
Work-related musculoskeletal disorders are common among computer users, especially involving the neck and shoulder region. Previous studies showed subjects with neck pain had altered muscle recruitment patterns that persisted throughout the sustained computing task. Moreover, some studies reported that working posture and psychological stress also influence muscle recruitment. Therefore the aim of this study was to investigate the interaction effect of working posture and psychological stress on muscle activity. Fourteen subjects (7 neck pain subjects and 7 healthy subjects) were recruited in this study. This study designated two working postures (upright sitting posture/ backward sitting posture) and two levels of psychological stress (standard typing task/ stressful typing task), and used surface EMG to collect the muscle activity of the upper trapezius and cervical erector spinae during a10-min typing process. Results showed psychological stress trends to increase the muscle activity, while a backward sitting posture trends to decrease muscle activity. Considering the busy and stressful life in modern lifestyle, this study suggests subjects with neck pain should maintain a backward sitting posture during computer use.
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Gerr, F., Marcus, M., Ensor, C., Kleinbaum, D., Cohen, S., Edwards, A., Gentry, E., Ortiz, D.J., Monteilh, C.: A prospective study of computer users: I. Study design and incidence of musculoskeletal symptoms and disorders. American Journal of Industrial Medicine 41, 221–235 (2002)
Klussmann, A., Gebhardt, H., Liebers, F., Rieger, M.: Musculoskeletal symptoms of the upper extremities and the neck: A cross-sectional study on prevalence and symptom-predicting factors at visual display terminal (VDT) workstations. BMC Musculoskeletal Disorders 9, 96 (2008)
Bansevicius, D., Sjaastad, O.: Cervicogenic headache: The influence of mental load on pain level and EMG of shoulder-neck and facial muscles. Headache 36, 372–378 (1996)
Falla, D., Bilenkij, G., Jull, G.: Patients with chronic neck pain demonstrate altered patterns of muscle activation during performance of a functional upper limb task. Spine 29, 1436–1440 (2004)
Hall, T.M., Quintner, J.L.: Responses to mechanical stimulation of the upper limb in painful cervical radiculopathy. Australian Journal of Physiotherapy 42, 277–285 (1996)
Straker, L., Skoss, R., Burnett, A., Burgess-Limerick, R.: Effect of visual display height on modelled upper and lower cervical gravitational moment, muscle capacity and relative strain. Ergonomics 52, 204–221 (2009)
Szeto, G., Straker, L., O’Sullivan, P.: A comparison of symptomatic and asymptomatic office workers performing monotonous keyboard work—1: Neck and shoulder muscle recruitment patterns. Manual Therapy 10, 270–280 (2005)
Szeto, G.P., Straker, L.M., O’Sullivan, P.B.: During computing tasks symptomatic female office workers demonstrate a trend towards higher cervical postural muscle load than asymptomatic office workers: An experimental study. Australian Journal of Physiotherapy 55, 257–262 (2009)
Waersted, M.: Human muscle activity related to non-biomechanical factors in the workplace. European Journal of Applied Physiology 83, 151–158 (2000)
Johnston, V., Jull, G., Darnell, R., Jimmieson, N.L., Souvlis, T.: Alterations in cervical muscle activity in functional and stressful tasks in female office workers with neck pain. European Journal of Applied Physiology 103, 253–264 (2008)
Chiu, T.T.W., Ku, W.Y., Lee, M.H., Sum, W.K., Wan, M.P., Wong, C.Y., Yuen, C.K.: A study on the prevalence of and risk factors for neck pain among university academic staff in Hong Kong. Journal of Occupational Rehabilitation 12, 77–91 (2002)
Yip, C.H.T., Chiu, T.T.W., Poon, A.T.K.: The relationship between head posture and severity and disability of patients with neck pain. Manual Therapy 13, 148–154 (2008)
Szeto, G.P.Y., Straker, L.M., O’Sullivan, P.B.: A comparison of symptomatic and asymptomatic office workers performing monotonous keyboard work–2: Neck and shoulder kinematics. Manual Therapy 10, 281–291 (2005)
Weon, J.H., Oh, J.S., Cynn, H.S., Kim, Y.W., Kwon, O.Y., Yi, C.H.: Influence of forward head posture on scapular upward rotators during isometric shoulder flexion. Journal of Bodywork and Movement Therapies 14, 367–374 (2010)
Liao, M.H., Drury, C.G.: Posture, discomfort and performance in a VDT task. Ergonomics 43, 345–359 (2000)
Schüldt, K., Ekholm, J., Harms-Ringdahl, K., Arborelius, U.P., Németh, G.: Influence of sitting postures on neck and shoulder e.m.g. during arm-hand work movements. Clinical Biomechanics 2, 126–139 (1987)
Kuorinka, I., Jonsson, B., Kilbom, A., Vinterberg, H., Biering-Sørensen, F., Andersson, G., Jørgensen, K.: Standardised Nordic questionnaires for the analysis of musculoskeletal symptoms. Applied Ergonomics 18, 233–237 (1987)
Kroemer, K.H.E., Grandjean, E.: Fitting the task to the human. Taylor & Francis, London (1997)
Johnston, V., Jimmieson, N.L., Souvlis, T., Jull, G.: Interaction of psychosocial risk factors explain increased neck problems among female office workers. Pain 129, 311–320 (2007)
Falla, D., Jull, G., Russell, T., Vicenzino, B., Hodges, P.: Effect of neck exercise on sitting posture in patients with chronic neck pain. Physical Therapy 87, 408–417 (2007)
O’Leary, S., Jull, G., Kim, M., Vicenzino, B.: Cranio-cervical flexor muscle impairment at maximal, moderate, and low loads is a feature of neck pain. Manual Therapy 12, 34–39 (2007)
Szeto, G.P.Y., Straker, L., Raine, S.: A field comparison of neck and shoulder postures in symptomatic and asymptomatic office workers. Applied Ergonomics 33, 75–84 (2002)
Harms-Ringdahl, K., Ekholm, J., Schüldt, K., Németh, G., Arborelius, U.P.: Load moments and myoelectric activity when the cervical spine is held in full flexion and extension. Ergonomics 29, 1539–1552 (1986)
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Chou, WY., Chen, BH., Chiou, WK. (2011). The Interaction Effect of Posture and Psychological Stress on Neck-Shoulder Muscle Activity in Typing: A Pilot Study. In: Robertson, M.M. (eds) Ergonomics and Health Aspects of Work with Computers. EHAWC 2011. Lecture Notes in Computer Science, vol 6779. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-21716-6_3
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