KBlog打字表現監測與前臂肌電圖之相關性探討
Correlation between KBlog monitoring for Typing Performance and Forearm EMG
Date Issued
2004
Date
2004
Author(s)
Chen, Jiun-Huang
DOI
zh-TW
Abstract
The fatigue of VDT user is highly associated with their working duration and workload. If the actual workload and working duration could be recorded, then it will very easy to predict fatigue or/and its extent. At present, the muscle fatigue is mainly measured by variation of frequency and amplitude in electromyography（EMG）. For field study, the EMG recording system is not so convenient to be applied to all study participants of a large sample size. Obviously, a new substitute monitoring method therefore is needed. KBlog, a typing recording system with proved good reliability, seems to be a much more convenient alternative. In this study, we evaluate the correlation between correlation between typing performance monitored with KBlog recording system and the typists’ forearm EMG.
This study recruited two groups of subjects, upper extremity pain group and healthy control group, which consisted of 28 and 23 female subjects respectively. These two groups were requested to perform 90 and 120 minutes continuous typing task respectively. The subjects were interviewed with questionnaires for subjective physical and psychological fatigue status before and after the typing task. During the typing task, the EMG monitoring was applied on forearms; meanwhile the typing performance and key stroke time were recorded by KBlog.
The results of KBlog show the key holding time in healthy group is significantly shorter then the pain group. And, the typing frequency of the healthy group was a little bit faster than the pain group. Moreover, the typing frequency becomes not significant different between the two groups after 75 minutes of typing work.
The EMG amplitude was positively correlated to typing frequency and standard deviation of key holding time and negatively correlated to average key holding time, minimum 20 key holding time and standard deviation of minimum 20 key holding time. The median frequency of EMG was negatively correlated to typing frequency and was positively correlated to average Key holding time and minimum 20 key holding time.
Subjects
打字作業
電腦使用者
工作負荷
VDT user
Workload
typing task
Type
thesis
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