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研究生:林明毅
研究生(外文):Ming-I,Lin
論文名稱:長時間打字作業與肌肉疲勞之肌電圖分析研究
論文名稱(外文):Electromyographic Assessment on Muscular Fatigue during the Long-Term Typing Activity
指導教授:黃耀輝黃耀輝引用關係
指導教授(外文):Yaw-Huei Hwang
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:職業醫學與工業衛生研究所
學門:醫藥衛生學門
學類:公共衛生學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:英文
論文頁數:73
中文關鍵詞:ergonomicselectromyogramdynamic contractionsmuscle fatiguetyping
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The main objectives of this study were to observe the alternations of muscle function resulting from the influence of high repetitive muscular activities and to verify the applicability of surface electromyogram (EMG) in characterizing low-force dynamics contractions. Therefore, an electromyographical fatigue analysis was performed in the long-term rapid typing experiment. Thirty subjects were recruited to type for 2 hours. The muscular activity of muscle extensor digitorum communis (EDC) and muscle flexor digitorum superficialis (FDS) of both hands were recorded throughout the entire experiment. The electrical activity (EA), root mean square (RMS), median frequency (MDF), and mean power frequency (MPF) were calculated, then regressed against the time courses of these parameters. The method of joint analysis of spectra and amplitudes of EMG (JASA) was introduced in this study and used to demodulate the EMG registrations into individual level. The results indicated that EA values of extensor muscles were higher than those of flexor muscles. Meanwhile, the traditional indication of muscle fatigue was also observed. It demonstrated a decreasing trend in the time series of frequency parameters throughout the entire trial and MDF values reduced by 25% comparing to the initial values obtained at the beginning of typing activities. Furthermore, 80% muscles manifested fatigue through the JASA method after the 2-hour typing experiment. Meanwhile, subjective discomfort and mental fatigue results were also reported by all subjects in this study. Results of the present study support the use of MDF values derived from surface EMG signals recorded during dynamic contractions to quantify fatigue of the EDC and FDS muscles, even at the low exerting force level (2% MVC). Moreover, the JASA method allows investigators to infer reasonable representations. From the perspective of ergonomics, appropriate relaxation is necessary to prevent muscle fatigue and moderate occupational related musculoskeletal disorders.
1. INTRODUCTION 1
1.1. COMMON REGIONS OF WORK-RELATED MUSCULOSKELETAL DISORDERS AMONG VDT GROUPS 2
1.2. ASSOCIATED FACTORS OF WRMSD AMONG VDT GROUP 2
1.3. OVERUSE INJURY 3
1.4. ERGONOMIC INTERVENTIONS 5
1.5. VDT RESEARCHES BASED ON THE ELECTROMYOGRAPHY TECHNIQUE 5
2. BACKGROUND 7
2.1. FATIGUE 7
2.1.1. Definition of fatigue 7
2.1.2. Possible processes of fatigue 8
2.2. ELECTROMYOGRAM (EMG) 12
2.2.1. Processing of the raw EMG in the time domain 16
2.2.1.1. Rectification, averaging and envelope detection 16
2.2.1.2. The Root-Mean-Square (RMS) value 17
2.2.1.3. Zero Crossings 17
2.2.1.4. A new amplitude parameter, “Muscular Activity”, denoted as ACT 17
2.2.2. Frequency domain analysis of the EMG signal 18
2.2.2.1. The median frequency (MDF) 19
2.2.2.2. The mean power frequency (MPF) 19
2.2.3. EMG fluctuation during the time course of muscular activities 20
2.2.4. The relationship between EMG and force 21
2.2.5. The EMG signal as a fatigue index 22
2.2.5.1. EMG signals fluctuations under isometric contractions 23
2.2.5.2. The changes in EMG signals during dynamic contractions 26
3. MATERIALS AND METHODS 30
3.1. SUBJECT RECRUITMENT 30
3.2. INSTRUMENTATION 31
3.2.1. Semi-field workstation 31
3.2.2. EMG monitoring system 32
3.2.3. Data acquisition system 34
3.2.4. Post-analysis system 34
3.2.4.1. Alternating current power line interference 35
3.2.4.2. EMG evaluation 37
3.2.4.2.1. Analyzing EMG in time domain 37
3.2.4.2.2. Analysis of EMG spectra 38
3.2.4.2.3. Joint analysis of spectra and amplitudes (JASA) 39
3.3. QUESTIONNAIRE 40
3.4. PROCEDURES 41
4. RESULTS 43
4.1. DEMOGRAPHIC INFORMATION ABOUT SUBJECTS 43
4.2. EMG CHANGES DURING MAXIMAL VOLUNTARY CONTRACTION 43
4.3. TIME-DEPENDANT CHANGES IN THE EMG 46
4.4. CORRELATION OF VARIOUS ELECTROMYOGRAPHIC PARAMETERS 50
4.5. JASA PLOTS 52
4.6. SUBJECTIVE RATINGS OF HEALTH STATUS AFTER THE TYPING TRIAL 56
5. DISCUSSION 58
5.1. A COMPARISON BETWEEN THE RESULTS OF MVC TEST AT DIFFERENT STAGES 58
5.2. TIME COURSES OF EMG PARAMETERS DURING DYNAMIC CONTRACTIONS 59
5.3. DEMODULATING EMG TRACES WITH THE JASA METHOD 62
5.3.1. Choosing the necessary variables for the JASA method 64
5.3.2. Physiological implications behind the JASA method 64
5.4. DIFFERENT REPRESENTATIONS BETWEEN EXTENSOR AND FLEXOR MUSCLES 69
5.5. FATIGUE RESULTING FROM TYPING ACTIVITIES 70
5.6. THE ACCEPTABLE LEVEL FOR UNLIMITED DURATION OF CONTRACTIONS 70
6. CONCLUSIONS 72
7. ACKNOWLEDGMENTS 73
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