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Published byBrooke Coolidge Modified over 10 years ago
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Eduardo J Salazar-Vega MHP CPH
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Ergo = work Nomos = laws It is an applied scientific/engineering discipline concerned with the interaction among systems and the people who operate and maintain them OSHA defines it as “the study of the design of requirements of work in relation to the physical and physiological capabilities and limitations of people Whenever a human becomes part of the operation of a system, ergonomics become a necessary consideration
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Ergonomics PhysiologyMedicine Anthropometrics Behavioral Science Engineering
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Psychological factors –attitude, motivation Somatic factors –age, sex, health, size Physiological factors –fuel, oxygen Learning factors –training, knowledge, adaptability Nature of work –intensity, duration, rhythm, technique, position Environment –heat, cold, noise, altitude, pollution
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Reactive ergonomics –corrective actions after the event occurs Proactive ergonomics –corrective actions taken before injuries and illnesses occur
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Tool/product design Workplace Design Integration of new technology Environmental Conditions Materials handling Task/job design Workstation design The goal of ergonomics is to make the workplace as adaptable as possible to the people who will be working on it.
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Control and display design Location and orientation of work surfaces Posture/work height and reaches Movements/repetitions Vibrations Accessibility Labels and location aids Guarding and warnings Hand tools Machinery and equipment design Size and shape of work objects Weight of work equipment and objects
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Lighting/noise Temperature/humidity Housekeeping Hazardous materials
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BenefitsManufacturing Measures Increased operator acceptance Injury/illness frequency and associated costs Worker’s compensation Employee turnover Employee absenteeism Safety awareness Increased dependability or reliability Scrap (error) rate Maintenance costs Machine up-time Logistic support Safety awareness Flexibility and adaptability to change Reprogramming time/cost Modifiability Part change Safety awareness Increased efficiency and productivity Parts/hours (shift) Scrap (error) rate Safety awareness
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Trends in accidents and injuries Incidence of cumulative trauma disorders Absenteeism, high turnover rate Employee complaints Employee-generated changes in the workplace Incentive pay systems Excessive overtime and increased work rate Poor product quality Manual materials handling and repetitive motion tasks Improperly designed workstations for disabled people
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Job Weight Location Frequency/Duration Stability Grip Workplace geometry Environment Personal Sex Strength Age Fitness Anthropometry Lifting techniques and training
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General observations Questionnaires Interviews Video analysis Photography Drawing or sketching Evaluation of workers capabilities Measurement of various risk factors
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Awkward postures High task repetition High force required Mechanical stress points Cold temperatures Fit of work gloves Poor workstation design Hand tool fit Vibration sources
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Lifting from the floor Lifting while twisting Lifting heavy weights Lifting bulky objects Lifting repeatedly Lifting above shoulder height Lifting heavy items while seated Pushing or pulling loads Nature of hand holds Storage methods Parts staging Floor condition in the work environment Workstation layout Conflicting movements Poor posture Bending
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http://www.cdc.gov/niosh/docs/94-110/
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Horizontal Distance (H) Vertical Distance (V) Vertical Travel Distance (D) Frequency of Task (F) Duration of Task Assymetry (A) Coupling (C) Weight of Load (L)
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Recommended Weight Limit RWL = LC x HM x VM x DM x AM x FM x CM Lifting Index LI = L/RWL
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RULA: Rapid Upper Limb Assessment (McAtamney & Corlett, 1993) REBA: Rapid Entire Body Assessment (Hignett & McAtamney, 2000)
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