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Approaches to the Assessment of Physical Exposure in VDT Work.

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Presentation on theme: "Approaches to the Assessment of Physical Exposure in VDT Work."— Presentation transcript:

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 Talk with co-worker Desk work Talk on phone Interactive editing Filing Filling out forms Walk to... Graphic editing Numeric pad entry

6 Physical Exposure for VDT Operators M 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

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

8 Physical Exposure for VDT Operators III- Exposure R/L Trapezius static Trapezius gaps R/L Wrist/finger extensor static Wrist/finger extensor gaps Tendon loads/strain Carpal canal pressure O 2 tension Twitch force Ca++ 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


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