- Volume 20 Issue 3
DOI QR Code
The Effect of Using Smart-Phones on Neck and Shoulder Muscle Activities and Fatigue
핸드폰 사용이 목과 어깨 근육의 근육활성도와 피로도에 미치는 영향
- Received : 2013.07.13
- Accepted : 2013.08.05
- Published : 2013.09.17
The smart-phone has become a necessity for most people. In this study, we determined that using a smart-phone for 20 minutes can cause increased neck and shoulder muscle activities and fatigue. Seventeen healthy male smart-phone users who attended Yonsei University played a smart-phone game for 20 minutes and changes in their bilateral cervical erector spinae and upper trapezius muscle activities and fatigue were measured. To assess muscle activities and fatigue, we used the following variables: the median frequency, the 50th percentile Amplitude probability distribution function (APDF) value (median load), and the discrepancy in the 90th percentile APDF value and the 10th percentile APDF value (APDF range). A paired t-test was used to compare pre-smart-phone-use status with post-smart-phone-use-status. The median frequency of the bilateral cervical erector spinae and the upper trapezius decreased significantly after 20 minutes of smart-phone use (p<.05). In addition, the 50th percentile APDF value of the bilateral cervical erector spinae and the right upper trapezius increased significantly (p<.05). The APDF range of the bilateral cervical erector spinae and the upper trapezius also increased significantly (p<.05). However, the 50th percentile APDF range of the left upper trapezius was not significantly different (p>.05). These findings suggest that using smart-phones for 20 minutes can induce muscle fatigue and increased neck and shoulder muscle activities.
Amplitude probability distribution function;Cervical erector spinae;Median frequency;Smart-phone;Upper trapezius
- Szeto GP, Lee R. An ergonomic evaluation comparing desktop, notebook, and subnotebook computers. Arch Phys Med Rehabil. 2002;83(4): 527-532. https://doi.org/10.1053/apmr.2002.30627
- Szeto GP, Lin JK. A study of forearm muscle activity and wrist kinematics in symptomatic office workers performing mouse-clicking tasks with different precision and speed demands. J Electromyogr Kinesiol. 2011;21(1):59-66. https://doi.org/10.1016/j.jelekin.2010.06.006
- Szeto GP, Straker LM, O'Sullivan PB. A comparison of symptomatic and asymptomatic office workers performing monotonous keyboard work-2: Neck and shoulder kinematics. Man Ther. 2005a;10(4): 281-291. https://doi.org/10.1016/j.math.2005.01.005
- Szeto GP, Straker LM, O'Sullivan PB. The effects of typing speed and force on motor control in symptomatic and asymptomatic office workers. Int J Ind Ergon. 2005b;35(9):779-795. https://doi.org/10.1016/j.ergon.2005.02.008
- Szeto GP, Straker LM, O'Sullivan PB. Examining the low, high and range measures of muscle activity amplitudes in symptomatic and asymptomatic computer users performing typing and mousing tasks. Eur J Appl physiol. 2009;106(2):243-251. https://doi.org/10.1007/s00421-009-1019-4
- Szeto GP, Straker LM, O'Sullivan PB. Emg median frequency changes in the neck-shoulder stabilizers of symptomatic office workers when challenged by different physical stressors. J Electromyogr kinesiol. 2005c;15(6):544-555. https://doi.org/10.1016/j.jelekin.2005.06.004
- Zhang FR, He LH, Wu SS, et al. Quantify work load and muscle functional activation patterns in neck-shoulder muscles of female sewing machine operators using surface electromyogram. Chin Med J (Engl). 2011;124(22):3731-3737.
- Christensen H. Muscle activity and fatigue in the shoulder muscles during repetitive work. An electromyographic study. Eur J Appl Physilo Occup Physiol. 1986;54(6):596-601. https://doi.org/10.1007/BF00943347
- Criswell E. Cram's Introduction to Surface Electromyography. 2nd ed. Sudbury, MA, Jones & Bartlett Publishers, 2010:49-53.
- Gerdle B, Elert J, Henriksson-Larsen K. Muscular fatigue during repeated isokinetic shoulder forward flexions in young females. Eur J Appl Physiol Occup Physiol. 1989;58(6):666-673. https://doi.org/10.1007/BF00418515
- Greig AM, Straker LM, Briggs AM. Cervical erector spinae and upper trapezius muscle activity in children using different information technologies. Physiotherapy. 2005;91(2):119-126. https://doi.org/10.1016/j.physio.2004.10.004
- Hagberg M. The amplitude distribution of surface EMG in static and intermittent static muscular performance. Eur J Appl Physilo Occup Physiol. 1979;40(4):265-272. https://doi.org/10.1007/BF00421518
- Hagg GM. Interpretation of emg spectral alterations and alteration indexes at sustained contraction. J Appl Physiol. 1992;73(4):1211-1217. https://doi.org/10.1152/jappl.19184.108.40.2061
- Jonsson B. Measurement and evaluation of local muscular strain in the shoulder during constrained work. J Hum Ergol (Tokyo). 1982; 11(1):73.
- Jonsson BG, Persson J, Kilbom A. Disorders of the cervicobrachial region among female workers in the electronics industry: A two-year follow up. Int J Ind Ergon. 1988;3(1):1-12. https://doi.org/10.1016/0169-8141(88)90002-9
- Arendt-Nielsen L, Mills KR. The relationship between mean power frequency of the emg spectrum and muscle fibre conduction velocity. Electroencephalogr Clin Neurophysiol. 1985;60(2): 130-134. https://doi.org/10.1016/0013-4694(85)90019-7
- Kim TJ, Cho SH, Cynn HS. A comparison of trapezius muscle activity while performing a dictation task, sitting in an auditorium chair and a classroom chair. Phys Ther Kor. 2012;19(1):46-55. https://doi.org/10.12674/ptk.2012.19.1.046
- Kim YG, Kang MH, Kim JW, et al. Influence of the duration of smartphone usage on flexion angles of the cervical and lumbar spine and on reposition error in the cervical spine. Phys Ther Kor. 2013;20(1):10-17. https://doi.org/10.12674/ptk.2013.20.1.010
- Kupa EJ, Roy SH, Kandarian SC, et al. Effects of muscle fiber type and size on emg median frequency and conduction velocity. J Appl Physiol. 1995;79(1):23-32. https://doi.org/10.1152/jappl.19220.127.116.11
- Lin K-mJ. A study of biomechanical factors associated with computer mouse use in symptomatic and asymptomatic office workers. Kowloon, The Hong Kong Polytechnic University, Doctoral Dissertation. 2008.
- Merletti R, Parker P. Electromyography: physiology, engineering and non-invasive applications. 1st ed. Hoboken, NJ, Wiley-IEEE Press, 2004:347-348.
- Murata A, Ishihara H. Evaluation of shoulder muscular fatigue induced during mouse operation in a vdt task. IEICE Trans Inf Syst. 2005;88(2): 223-229.
- Pew Research Center. Smartphone Ownership 2013 [Internet]. Washington D.C., 1990 [cited 2013 June 5]. Available from: http://www.pewinternet.org/Reports/2013/Smartphone-Ownership-2013/Findings.aspx.
- Shin G, Zhu X. User discomfort, work posture and muscle activity while using a touchscreen in a desktop pc setting. Ergonomics. 2011;54(8): 733-744. https://doi.org/10.1080/00140139.2011.592604
- Sjogaard G, Kiens B, Jorgensen K, et al. Intramuscular pressure, emg and blood flow during low‐level prolonged static contraction in man. Acta Physiol Scand. 1986;128(3):475-484. https://doi.org/10.1111/j.1748-1716.1986.tb08002.x
- Straker LM, Coleman J, Skoss R, et al. A comparison of posture and muscle activity during tablet computer, desktop computer and paper use by young children. Ergonomics. 2008;51(4):540-555. https://doi.org/10.1080/00140130701711000
- Effect of duration of smartphone use on muscle fatigue and pain caused by forward head posture in adults vol.28, pp.6, 2016, https://doi.org/10.1589/jpts.28.1669
- The Changes in Convergence Function of Accommodative Anomalies in their Twenties after Watching Video on a Smartphone vol.22, pp.2, 2017, https://doi.org/10.14479/jkoos.2017.22.2.133
- The effects of smart phone gaming duration on muscle activation and spinal posture: Pilot study vol.33, pp.8, 2017, https://doi.org/10.1080/09593985.2017.1328716
- Effects of sternocleidomastoid muscle and suboccipital muscle soft tissue release on muscle hardness and pressure pain of the sternocleidomastoid muscle and upper trapezius muscle in smartphone users with latent trigger points vol.97, pp.36, 2018, https://doi.org/10.1097/MD.0000000000012133