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Workload Evaluation of Various Shoulder Posture by using Muscle Force, Fatigue and Psychophysical Workload
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 Title & Authors
Workload Evaluation of Various Shoulder Posture by using Muscle Force, Fatigue and Psychophysical Workload
Park, Ji-Soo; Kim, Jung-Yong;
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Objective: The purpose of this study is to evaluate the potential risk of shoulder muscle at particular working postures in sitting. Background: The cause of shoulder pain needs to be specifically studied in relation with particular shoulder postures to prevent shoulder MSDs in workplace. Method: In this study MVC, fatigue and subjective workload were investigated depending on the change of shoulder posture. An experiment was designed to evaluate the six shoulder muscles at nine shoulder postures including the combination of 30(adduction), 0, 30(abduction) degrees and 60, 90, and 120 degrees of shoulder flexion. Surface electrodes were attached to the middle trapezius, inferior middle trapezius, anterior deltoid, posterior deltoid, serratus anterior and teres major. Thirteen subjects participated in the experiment. Dependent variables were RPE (rating of perceived exertion), MVC(maximum voluntary contraction) and MPF(mean power frequency) shift by EMG (electromyography). Results: The middle trapezius and inferior middle trapezius were not significantly fatigued at all postures. The decline of MPF slope was less than 10% at all postures. The anterior deltoid was significantly fatigued all postures. The decline of MPF slope was more than 10% at all postures. The posterior deltoid was significantly fatigued 30 degrees of adduction and 90 degrees of flexion. And, neutral and 30 degrees of abduction postures were fatigued more than 90 degrees of flexion. The serratus anterior was significantly fatigued except for 30 degrees of adduction and 60 degrees of flexion posture. The teres major was significantly fatigued except for neutral and 60 degrees of flexion, 30 degrees of abduction and 60 degrees of flexion posture. Conclusion: It was found that a certain muscle was fatigued fast at particular posture compared to other muscles, which would mean that a certain shoulder muscle at particular posture could be easily exposed to the risk of musculoskeletal disorders than other muscles. Application: It is expected that the result can be applied to design workplace using shoulder muscles.
Muscle force;Electromyography;RPE;Posture;Workload;
 Cited by
자세안정성 원리에 기반한 환자이동기술 개발 및 효과검정,마예원;정덕유;

대한간호학회지, 2016. vol.46. 1, pp.39-49 crossref(new window)
어깨, 팔꿈치, 손목의 자세에 따른 최대악력과 근육활동에 관한 연구,김태형;정승래;강성식;장성록;

한국안전학회지, 2016. vol.31. 4, pp.111-119 crossref(new window)
Effects of Combinational Posture of Shoulder, Elbow and Wrist on Grip Strength and Muscle Activity, Journal of the Korean Society of Safety, 2016, 31, 4, 111  crossref(new windwow)
Development of Patient Transfer Techniques based on Postural-stability Principles for the Care Helpers in Nursing Homes and Evaluation of Effectiveness, Journal of Korean Academy of Nursing, 2016, 46, 1, 39  crossref(new windwow)
Astrand, P. O. and Kaare Rodahl, K., Textbook of Work Physiology: Physiological Bases of Exercise; 3rd ed. McGraw-Hill, New York, 1986.

Basmajian, J. V. and De Luca, C. J., Muscle Alive: Their Functions Revealed by Electromyography; 5th ed. Williams and Wilkins, London, 1985.

Brox, J. L., Shoulder pain, Best Practice & Research Clinical Rheumatology, 17(1), 33-56, 2003. crossref(new window)

Buckle, P. W. and Devereux, J. J., The nature of work-related neck and upper limb musculoskeletal disorders, Applied Ergonomics, 33, 207 -217, 2002. crossref(new window)

Ebaugh, D. D., McClure, P. W. and Karduna, A. R., Effects of shoulder muscle fatigue caused by repetitive overhead activities on scapulothoracic and glenohumeral kinematics, Journal of Electromyography and Kinesiology, 16, 224-235, 2006. crossref(new window)

Ekstrom, R. A., Soderberg, G. L. and Donatelli, R. A., Normalization procedures using maximum voluntary isometric contractions for the serratus anterior and trapezius muscles during surface EMG analysis, Journal of Electromyography and Kinesiology, 15, 418-428, 2005. crossref(new window)

Farina, D. and Madeleine, P., Thomas Graven-Nielsen, Roberto Merletti, and Lars Arendt-Nielsen, 2002. Standardising surface electromyogram recordings for assessment of activity and fatigue in the human upper trapezius muscle, European Journal of Applied Physiology, 86, 469 -478. crossref(new window)

Garg, A., Hegmann, K. T., Schwoerer, B. J. and Kapellusch, J. M., The effect of maximum voluntary contraction on endurance times for the shoulder girdle, International Journal of Industrial Egonomics, 30, 103-113, 2002. crossref(new window)

Garg, A., Hegmann, K. and Kapellusch, J., Short-cycle overhead work and shoulder girdle muscle fatigue, International Journal of Industrial Ergonomics, 36, 581-597, 2006. crossref(new window)

Kee, D. H. and Seo, S. R., Musculoskeletal disorders among nursing personnel in Korea, International Journal of Industrial Ergonomics, 37, 207-212, 2007. crossref(new window)

Kim, J. Y., Chung, M. K. and Park, J. S., Measurement of Physical Work Capacity During Arm and Shoulder Lifting at Various Shoulder Flexion and Ad/Abduction Angles, Human Factors and Ergonomics in Manufacturing, 13 (2), 153-163, 2003. crossref(new window)

Larsson, B., Sogarrd, K. and Rosendal, L., Work related neck-shoulder pain: a review on magnitude, risk factors, biochemical characteristics, clinical picture and preventive interventions, Best Practice & Research Clinical Rheumatology, 21(3), 447-463, 2007. crossref(new window)

Minning, S., Eliot, C. A., Uhl, T. L. and Malone, T. R., EMG analysis of shoulder muscle fatigue during resisted isometric shoulder elevation, Journal of Electromyography and Kinesiology, 17, 153-159, 2007. crossref(new window)

Norkin C. C. and Levangie, P. K., Joint Structure and Function: A Comprehensive Analysis; 2nd ed. F.A. Davis Company, 1992.

Oberg, T., Sandsjo, L, and Kadefors, R., EMG mean power frequency: obtaining a reference value, Clinical Biomechanics, 9, 253-257, 1994. crossref(new window)

Oberg T., Muscle fatigue and calibration of EMG measurements, Journal of Electromyography and Kinesiology, 5(4), 239-243, 1995. crossref(new window)

Park, J. S. and Kim, J. Y. Physical Strength and Fatigue Measurement of the Shoulder in a Sitting Position, The Japanese Journal of Ergonomics, June, Vol.44, pp.386-388, 2008a. crossref(new window)

Park, J. S. and Kim, J. Y., The Muscle Fatigue Prediction Model for Various Shoulder Postures, Joint Conference of International Association of Societies of Design Research, The Ergonomics Society of Korea, Korean Journal of the Science of Emotion and Sensibility, Kimhae, October, 2008b.

Park, J. S. and Kim, J. Y., Regression analysis of fatigue at various shoulder postures in sitting, Proceedings of the 9th Pan-Pacific Conference on Ergonomics, November 7-10, Kaohsiung Taiwan, 2010.

Pedersen, J., Lönn, J., Hellstrom, F., Djupsjobacka, M. and Johansson, H., Localized muscle fatigue decreases the acuity of the movement sense in the human shoulder, Medicine & Science in Sports & Exercise, 31(7), July, 1047-1052, 1999. crossref(new window)

Shin, M. K., Koo J. Y., Kim, B, W., Shim, J. W., Yoo, K. W. and Cho, K. P., Human Anatomy, Hynmoon, Seoul, 1993.

Strimpakos, N., Georgios, G., Eleni, K., Vasilios, K. and Jacqueline, O., Issues in relation to the repeatability of and correlation between EMG and Borg scale assessments of neck muscle fatigue, Journal of Electromyography and Kinesiology, 15, 452-465, 2005. crossref(new window)

Troiano, A., Naddeo, F., Sosso, E., Camarota, G., Merletti, R. and Mesin, L., Assessment of force and fatigue in isometric contractions of the upper trapezius muscle by surface EMG signal and perceived exertion scale, Gait & Posture, 28, 179-186, 2008. crossref(new window)