Effects of laptop screen height on neck and shoulder muscle fatigue and spine loading for office workers.
BACKGROUND: Due to the unfavourable neck-shoulder muscle loads caused by poor posture, the people who use the laptop for a long time may face the risk of neck and shoulder injuries. OBJECTIVE: The purpose of this study investigates the impact of the screen height on the muscle activation of head fle...
| Published in: | Work Vol. 79; no. 4; pp. 1925 - 1938 |
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| Main Authors: | , , , , , , |
| Format: | pictorial research tables/charts Journal Article |
| Published: |
Sage Publications Inc.
2024
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| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=181836114&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 181836114 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 10519815 3RC jtl: Work issn: 10519815 maglogo: N pubinfo: dt: 2024 vid: 79 iid: 4 pid: 344 pub: Sage Publications Inc. place: Thousand Oaks, California artinfo: ui: 181836114 178429280 181836114 181836114 10.3233/WOR-230719 181836114 ppf: 1925 ppct: 13 formats: fmt: – @attributes: type: T – @attributes: type: P tig: atl: Effects of laptop screen height on neck and shoulder muscle fatigue and spine loading for office workers. aug: au: Guo, Zenghui Chen, Zhiyuan Pai, Junjun Fang, Bin Liang, Wenhao Su, Guosheng Zheng, Feng affil: School of Mechanical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China sug: subj: Muscle, Skeletal Physiology Head Physiology Ergonomics Neck Physiology Shoulder Physiology Cervical Vertebrae Physiology Spine Physiology Torque Evaluation Computers, Portable Computer Terminals Treatment Outcomes Muscle Fatigue Evaluation Human Reading Task Performance and Analysis Electromyography Evaluation Signal Processing, Computer Assisted One-Way Analysis of Variance Simulations Flexion Physiology Risk Assessment Funding Source Male Female Adult Software Experimental Studies Posture Evaluation Biosensors Repeated Measures Paired T-Tests Data Analysis Software Regression Adult: 19-44 years Male Female ab: BACKGROUND: Due to the unfavourable neck-shoulder muscle loads caused by poor posture, the people who use the laptop for a long time may face the risk of neck and shoulder injuries. OBJECTIVE: The purpose of this study investigates the impact of the screen height on the muscle activation of head flexion, neck and shoulder, and the cervical spine torque to provide the favorite screen height for laptop user. METHODS: Twelve healthy young participants completed a 15-minute task of the reading at the four different screen heights. sEMG signals of the splenius capitis (SC) and upper trapezius (UT) were measured and calculated the root mean square (RMS) and mean power frequency (MPF) to determine muscle fatigue. The different height of laptop users was simulated and the forces on the spine of users at different screen heights were analyzed by Jack. RESULTS: Adjusting the height of the laptop screen can effectively reduce head flexion and muscle activity of SC and UT, and has a positive effect on reducing fatigue of SC, but has no significant effect on UT. CONCLUSIONS: Adjusting the height of the laptop screen can delay the occurrence of SC muscle fatigue to a certain extent. The joint analysis of sEMG spectrum and amplitude reports that the screen heights of D15 and D45 have the highest and the lowest frequency of fatigue, respectively. At the same time, the moment of spineT1/T2 and spineL4/L5 decrease with the increase of screen height. pubtype: Academic Journal doctype: pictorial research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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