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http://dx.doi.org/10.5762/KAIS.2013.14.3.1258

Effects of Touchpad &Buttons Positions in a Laptop Computer on EMG Amplitude and Median Frequency of Muscles Relating to Wrist and Shoulder  

Han, Seung Jo (Industrial Engineering Department, Dankook University)
Kim, Sun-Uk (Industrial Engineering Department, Dankook University)
Koo, Kyo Chan (Industrial Engineering Department, Dankook University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.14, no.3, 2013 , pp. 1258-1265 More about this Journal
Abstract
The objective of this study is to investigate the association between touchpad &buttons locations in a laptop computer and EMG amplitude and median frequency in muscles related with wrist and shoulder. Based on previous studies it was shown how abductions in wrist and shoulder could cause musculoskeletal disorders in those body parts, on which research hypotheses were established. Touchpad &buttons positions consisted of bottom center(BC), bottom center with $45^{\circ}$ rotation counterclockwise(BCR), and bottom right(BR). 10 subjects performed the task that required only touchpad &buttons usage with their preferred hand and EMG amplitude and median frequency data were recorded during 5min and analyzed afterwards. Upper trapezius and flexor carpi ulnaris were selected as target muscles. The results showed that in flexor carpi ulnaris BC resulted in greater amplitude and less median frequency than BCR and BR, but there was no significant difference between BCR and BR. In upper trapezius BC and BCR induced higher amplitude and lower median frequency than BR, but the significant difference between BC and BCR was not observed. Those phenomena occurred since BC gave rise to both wrist and shoulder abduction, BCR caused only shoulder one, and BR did not lead to abductions in both wrist and shoulder.
Keywords
Abduction; EMG; Shoulder; Touchpad; Wrist;
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