30-04-2012, 02:42 PM
Ergonomics
Ergonomics_3.ppt (Size: 94 KB / Downloads: 58)
STATIC EXERTIONS
Holding activities
Carrying
Standing
Pushing and pulling
Arms raised
EFFECTS OF STATIC EXERTION
When effort greater than or equal to 60 percent MVC blood flow almost completely interrupted.
15-20 percent MVC blood flow just about normal but still is associated with pain.
MVC less than or equal to eight percent can probably be maintained indefinitely.
WORKSTATION GUIDELINES
Reduce static component and allow worker to use optimal posture
Optimal posture usually at midpoint of limbs range of motion
Avoid muscular insufficiency
Avoid forward reaches in excess of 16”
Elbows down close to the body flexor angle around 90 degrees
WORKPLACE USE OF BACK BELTSNIOSH 94-122
Insufficient Data that belts significantly reduce trunk loading
Insufficient data that wearing reduces risk of injury based on IAP and EMG
May strain cardiovascular system
Insufficient data that discontinuation of use increases risk among healthy workers