Lack of Recovery Periods RP
4.1. Applicability of the CEI
The proposed CEI model has been applied successfully in several studies performed by the author unpublished reports; this success shows that it can be used in the study of many repetitive single or multiple tasks without any limitations. In most cases the aim of studies has been to identify and assess the risk factors of UEMSDs and injuries for individual employees. A more detailed and general purpose was to assay, measure and investigate the reliability and validity of various survey risk factors involving in calculating the CEI Score. The studies have been performed in different fields, including weaving and textile industries, manufacturing industries, carpentry, steel industry, post offices, service industry, electronic industry, shopping and marketing, agriculture and farming industry, tailoring and sewing, hair styling, baking, and bricklaying.4.1. Applicability of the CEI
The proposed CEI model has been applied successfully in several studies performed by the author unpublished reports; this success shows that it can be used in the study of many repetitive single or multiple tasks without any limitations. In most cases the aim of studies has been to identify and assess the risk factors of UEMSDs and injuries for individual employees. A more detailed and general purpose was to assay, measure and investigate the reliability and validity of various survey risk factors involving in calculating the 4.2. Reliability and validity tests of the CEI 4.2.1. Inter-observer reliability test of the assessment items Inter-observer assessment reliability Table 11 was assessed to identify possible sources of error in the reliability assessment test process. In this test, 31 various tasks were randomly selected from 31 different jobs involving manual handling tasks with varied part load weights. The ergonomic field study assessed static and repetitive tasks; highly repetitive tasks; repetitive tasks with low, moderate and high force exertions; sedentary or standing tasks; and non- repetitive tasks with low, moderate and high force exertions. Video-tape recordings were viewed in slow motion to confirm the assessment of the observer. Several pilot tests quantified that assessment durations of 5-7 minutes are sufficient to complete the assessmentParts
» Bus driving posture Introduction
» MSDs among Malaysian bus drivers
» Sampling and observation Methods
» RULA analysis Modeling and evaluating the seat design
» Current Seat measurement Results
» Backrest Redesigning the current seat 1. Seat pan
» Stimuli and experimental task
» Measurement of vibration Methods
» Subjects Grass cutting and noise
» Personal interview Difficulty Index
» Stimuli and general experimental procedure
» General background data Results
» Reliabilities measure The correlation coefficient
» Effects of job characteristics on job satisfaction
» Effects of environmental factors on job satisfaction
» Effects of job organization of job satisfaction
» Effects of age, work experience and marital status on job satisfaction
» Force Exertion FE Introduction of variables involved in calculating the CEI
» Frequency of Force Exertion FF
» Duration of Force Exertion DF
» Part Weight PW Introduction of variables involved in calculating the CEI
» Age Factor AF Introduction of variables involved in calculating the CEI
» Effective Item EI Introduction of variables involved in calculating the CEI
» Intra-observer reliability test of the assessment items
» Validity test of the assessment items
» Validity test of the CEI action levels
» Subjects Chairs and workstation
» Variables measured Questionnaire survey use of rating scales
» Questionnaire Questionnaire survey use of rating scales
» Effect of chair, time, overall comfort and discomfort on body posture movements
» Effects of comfort and discomfort factors on overall comfort and discomfort perception
» Interaction of individual comfort and discomfort on comfort and discomfort perception
» Interactions of discomfort factors with impression in comfort perception
» Interactions of discomfort factors with relax in comfort perception
» Interactions of discomfort factors with relief in comfort perception
» Interaction of discomfort factors with impression in discomfort perception
» Interaction of discomfort factors with relaxation in discomfort perception
» Interaction of discomfort factors with relief in discomfort perception
» Proposed comfortdiscomfort model Method
» Health Seeking Behaviour Results
» Risk Factor Analysis Results
» Work Station Analysis Results
» Mental Health Status Results
» Challenges in ergonomics design
» The integrated ergonomics analysis and QFD method Methods
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