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Approaches to the Assessment of Physical Exposure in VDT Work
Methods of Investigating WMSD and Methods of Investigating WMSD and VDT OperatorsVDT Operators
EpidemiologicIssue: How to measure “Exposure” (and
Health)?
LaboratoryIssue:What are relevant measures?
Methods of Investigating WMSD and Methods of Investigating WMSD and VDT OperatorsVDT Operators
Epidemiologic ApproachesQuestionnairesWork SamplingTechnical Exposure Assessment
Surface EMGPosture registration
Laboratory ApproachesSurface ElectromyogramsIndwelling Electromyograms
VDT Office EnvironmentVDT Office Environment
Work in VDT Office EnvironmentWork in VDT Office Environment
Talk with co-workerTalk with co-worker
Desk workDesk work
Talk on phoneTalk on phone
Interactive editingInteractive editing
FilingFiling
Filling out Filling out formsforms
Walk to ...Walk to ...
Graphic editing Graphic editing
Numeric pad entryNumeric pad entry
Physical Exposure for VDT OperatorsPhysical 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
Physical Exposure for VDT OperatorsPhysical Exposure for VDT Operators
InternalInternal ExternalExternalExposure Predictors of Exposure
Immediate/Immediate/ More Distant/More Distant/ Proximal Proximal Distal Distal
Posture
Force
RepetitivenessMuscleForce,Activation, Rest,Metabolism
TendonForce, FrictionMovement,Nutrition
Duration
(Median) NervePressure,Contact Stress,Friction, Stretch
Physical Exposure for VDT OperatorsPhysical 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 O2 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