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Approaches to the Assessment of Physical Exposure in VDT Work

Approaches to the Assessment of Physical Exposure in VDT Work. Methods of Investigating WMSD and VDT Operators. Epidemiologic Issue: How to measure “Exposure” (and Health)? Laboratory Issue:What are relevant measures?. Methods of Investigating WMSD and VDT Operators.

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Approaches to the Assessment of Physical Exposure in VDT Work

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  1. Approaches to the Assessment of Physical Exposure in VDT Work

  2. Methods of Investigating WMSD and VDT Operators • Epidemiologic • Issue: How to measure “Exposure” (and Health)? • Laboratory • Issue:What are relevant measures?

  3. Methods of Investigating WMSD and VDT Operators Epidemiologic Approaches • Questionnaires • Work Sampling • Technical Exposure Assessment • Surface EMG • Posture registration Laboratory Approaches • Surface Electromyograms • Indwelling Electromyograms

  4. VDT Office Environment

  5. Work in VDT Office Environment Filing Interactive editing Walk to ... Desk work Talk with co-worker Filling out forms Talk on phone Graphic editing Numeric pad entry

  6. Physical Exposure for VDT Operators I-Distal Predictors of Exposure *Job design *Task variety *Workstation dimensions II-Proximal Predictors of Exposure *Wrist Posture *Keystrokes force III- (Internal) Exposure *Muscle activation *Tendon Load M

  7. Physical Exposure for VDT Operators Internal External Exposure Predictors of Exposure Immediate/ More Distant/ Proximal Distal Posture Repetitiveness Muscle Tendon Force, Activation, Rest, Metabolism Force, Friction Movement, Nutrition (Median) Nerve Pressure, Contact Stress, Friction, Stretch Duration Force

  8. Physical Exposure for VDT Operators II-Proximal Predictors of Exposure • Wrist posture • Shoulder posture • Neck posture • Gaze angle • %time sitting • % steps walked • Hand Activity Level • Keystrike force I-Distal Predictors of Exposure • Job title • Workgroups • Task variety • # task transitions • Workstation dimensions • Key depression force • Control • Psychological demand III- Exposure • R/L Trapezius static • Trapezius gaps • R/L Wrist/finger extensor static • Wrist/finger extensor gaps • Tendon loads/strain • Carpal canal pressure • O2 tension • Twitch force • Ca++

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