A Quantitative Study About How the Wrist Rest Affect Muscle Fatigue During Keyboard Operation

doi:10.11985/2017.04.004

Abstract

Abstract:

In this paper, the value of the wrist supports is studied exactly in reducing muscular fatigue through researching surface electromyogram signal (sEMG) on three forearm muscles and one back muscle during the computer keying task. The sEMG is measured and collated from 10 test recipients in four different conditions in the experiment. After normalizing the sEMG data (NsEMG), SPSS 20 is used to analyze the NsEMG. The conclusion of the study is that upper trapezius (UT) is easiest muscle to fatigue while in the keyboard task and its degree of tiring does nothing to do with the wrist supports. But there is a remarkable difference in using the clothing wrist supports reflected by flexor digitorum superficialis (FDS) (P<0.05).

Key words: Surface electromyography, keyboard wrist rest, data normalization, muscle fatigue

CLC Number:

TB18

Chen Dengkai,Liu Tianyu,Chen Jing. A Quantitative Study About How the Wrist Rest Affect Muscle Fatigue During Keyboard Operation[J]. Journal of Electrical Engineering, 2017, 12(4): 22-26.

Figures/Tables 3

References 21

[1]	Derango K, Amick B, Robertson M , et al. The productivity consequences of two ergonomic interventions[J]. Ssrn Electronic Journal, 2003. doi: 10.1177/1937586715568986 pmid: 25816381
[2]	Aarås A, Horgen G, Bjørset H H , et al. Musculoskeletal, visual and psychosocial stress in VDU operators before and after multidisciplinary ergonomic interventions[J]. Applied Ergonomics, 1998,29(5):335-354. doi: 10.1016/s0003-6870(97)00079-3 pmid: 9703348
[3]	Grooten W J, Mulder M, Wiktorin C . The effect of ergonomic intervention on neck/shoulder and low back pain[J]. Work, 2007,28(4):313-323. pmid: 17522452
[4]	Amell T K, Kumar S . Cumulative trauma disorders and keyboarding work[J]. International Journal of Industrial Ergonomics, 2000,25(1):69-78. doi: 10.1097/JOM.0000000000000080 pmid: 24451617
[5]	朱伟, 张智君 . 不同键盘、输入速度的sEMG、绩效及舒适性比较[J]. 人类工效学, 2010,16(3):1-4.
	Zhu Wei, Zhang Zhijun . Comparison of Surface EMG performance and subjective comfort while using different typing speed operating on different keyboards[J]. Chinese Journal of Ergonomics, 2010,16(3):1-4.
[6]	楚杰 . 保健型人机键盘的参数优化与工效学设计[J]. 人类工效学, 2009,15(3):29-33.
	Chu jie . Optimization and ergonomics design of human-computer keyboard[J]. Chinese Journal of Ergonomics, 2009,15(3):29-33.
[7]	张晓凡, 张鹏 . 一种降低手臂疲劳的计算机键盘的设计[J]. 包装工程, 2012(18):64-67.
	Zhang Xiaofan, Zhang Peng . A design on computer keyboard to abate the tiredness of human arms[J]. Packaging Engineering, 2012(18):64-67.
[8]	吴小勇 . 键盘操作板的人机工程学设计和分析[J]. 人类工效学, 1998(1):58-60.
	Wu Xiaoyong . The ergonomics design and analysis of the keyboard control panel[J]. Chinese Journal of Ergonomics, 1998(1):58-60.
[9]	卫静, 李晓军, 焦凯 , 等. 连续键盘输入作业疲劳状况研究[J]. 人类工效学, 2014,20(5):18-22.
	Wei Jing, Li Xiaojun, Jiao Kai . Exploring the fatigue characters of operators in continuous typing task through keystroke[J]. Chinese Journal of Ergonomics, 2014,20(5):18-22.
[10]	Delisle A, Larivière C, Plamondon A , et al. Musculoskeletal disorders and computer work: the impact of workstation layout on posture and muscle load of the upper limbs[R]. Technical Report, 2006.
[11]	Delisle A, Larivière C, Plamondon A , et al. Comparison of three computer office workstations offering forearm support: impact on upper limb posture and muscle activation[J]. Ergonomics, 2006,49(2):139-160. doi: 10.1080/10610270500450739 pmid: 16484142
[12]	Cook C, Limerick R B . Forearm support for intensive keyboard users: a field study[J]. Proceedings of Hf, 2002. doi: 10.1016/j.apergo.2004.03.005 pmid: 15159198
[13]	Cook C, Burgess-Limerick R, Papalia S . The effect of wrist rests and forearm support during keyboard and mouse use[J]. International Journal of Industrial Ergonomics, 2004,33(5):463-472. doi: 10.1016/j.ergon.2003.12.002
[14]	Hambrusch S, Liu C M, Prabhakar S . Effects of wrist rest and forearm support on muscle activity[J]. Perceptual & Motor Skills, 2006,103(3):873. doi: 10.1016/j.actpsy.2019.102958 pmid: 31864215
[15]	Kamil N S, Dawal S Z . Effect of postural angle on back muscle activities in aging female workers performing computer tasks[J]. Journal of Physical Therapy Science, 2015,27(6):1967-1970. doi: 10.1589/jpts.27.1967 pmid: 26180359
[16]	Nag P K, Pal S, Nag A , et al. Influence of arm and wrist support on forearm and back muscle activity in computer keyboard operation[J]. Applied Ergonomics, 2009,40(2):286-291. doi: 10.1016/j.apergo.2008.04.016
[17]	Keir P J, Wells R P . The effect of typing posture on wrist extensor muscle loading[J]. Human Factors, 2002,44(3):392-403. doi: 10.1518/0018720024497655 pmid: 12502157
[18]	Tomatis L, Nakaseko M, Läubli T . Co-activation and maximal EMG activity of forearm muscles during key tapping[J]. International Journal of Industrial Ergonomics, 2009,39(5):749-755. doi: 10.1016/j.ergon.2008.12.006
[19]	宋海燕, 张建国, 王珺 , 等. 基于表面肌电的人体背部负重行走肌肉疲劳特性研究[J]. 生物医学工程学杂志, 2016(3):426-430.
	Song Haiyan, Zhang Jianguo, Wang Jun , et al. Study on muscle fatigue property of human body in shoulder loaded walking based on surface electromyogram[J]. Journal of Biomedical Engineering, 2016(3):426-430.
[20]	Powell R G . Wrist rest for keyboard: US, US 5234186 A[P]. 1993.
[21]	Cholewicki J, Van D J, Lee A S , et al. A comparison of a maximum exertion method and a model-based, sub-maximum exertion method for normalizing trunk EMG[J]. Journal of Electromyography & Kinesiology Official Journal of the International Society of Electrophysiological Kinesiology, 2011,21(5):767-773. doi: 10.1007/s00455-019-10086-x pmid: 31863177

因变数	（I）	（J）	平均值差异（I-J）	显著性
FDS	1	2	7.009 00*	0.001
		3	3.749 21	0.070
		4	2.550 62	0.212
	2	1	-7.009 00*	0.001
		3	-3.259 79	0.113
		4	-4.458 38*	0.033
	3	1	-3.749 21	0.070
		2	3.259 79	0.113
		4	-1.198 59	0.554
	4	1	-2.550 62	0.212
		2	4.458 38*	0.033
		3	1.198 59	0.554