- LIFTING
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POSTURE & FORCE
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HIGH
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• Lift > 50 lbs with load in "Good" lifting zone
• Lift > 35 lbs with load in "Awkward" lifting zone
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LOW
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• Lift < 20 lbs with load in "Good" lifting zone
• Lift < 10 with load in "Awkward" lifting zone
REPETITION & DURATION
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HIGH
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• Frequency > 6 lifts per minute
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LOW
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• Frequency < 1 lifts every 10 min. (< 6 per hour)
PUSH / PULL
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POSTURE & FORCE
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HIGH
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• Two-handed push or pull force > 60 lbs
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LOW
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• Two-handed push or pull force < 20 lbs
REPETITION & DURATION
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HIGH
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• Frequency > 5 push or pull forces per minute
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LOW
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• Frequency < 1 every 15 minutes (< 4 per hour)
CONTACT
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POSTURE & FORCE
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HIGH
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• High level of contact stress (Example: forcefully strike corner with palm of hand)
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LOW
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• Low level of contact stress (Example: rest arm on edge of moderately sharp table edge/corner)
REPETITION & DURATION
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HIGH
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• Actual contact stress duration > 65% of task cycle
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LOW
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• Actual contact stress duration < 25% of task cycle
HAND / WRIST
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POSTURE & FORCE
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HIGH
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• Near full bending of wrist
• High hand or finger force (Examples: grip > 50 lbs, pinch > 10 lbs, finger force > 10 lbs) -
LOW
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• Slight bending of the wrist (< 10°)
• Light hand forces (Examples: grip < 10 lbs, pinch < 3 lbs, finger force
< 3 lbs)
REPETITION & DURATION
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HIGH
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• Frequency > 20 per minute
• Posture duration > 65% of task cycle -
LOW
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• Frequency < 6 per minute
• Posture duration < 35% of task cycle
ELBOW
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POSTURE & FORCE
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HIGH
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• Near full rotation of the forearm (palm-up or palm-down position)
• Forceful arm motion (open/close elbow, rotate forearm). Example: one-arm push/pull > 25 lbs -
LOW
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• Rotation of forearm < 20°
• Arm motions requiring little effort (example: one-arm push/pull force < 5 lbs)
REPETITION & DURATION
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HIGH
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• Frequency > 15 per minute
• Posture duration > 65% of task cycle -
LOW
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• Frequency < 4 per minute
• Posture duration < 35% of task cycle
TRUNK
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POSTURE & FORCE
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HIGH
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• Forward bending or twisting > 60°
• Side bending > 30° -
LOW
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• Forward bending < 20°
• Twisting < 15°
• Side bending < 10°
REPETITION & DURATION
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HIGH
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• Frequency > 3 per minute
• Posture duration > 50% of task cycle -
LOW
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• Frequency < 1 per minute
• Posture duration < 25% of task cycle
NECK STRESS
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POSTURE & FORCE
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HIGH :
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▪ Near full bending of neck (forward, backward, or to the side)
-Posture duration > 65% of task cycle -
LOW
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• Slight bending of the neck (< 10°)
REPETITION & DURATION
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HIGH :
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-Frequency > 15 per minute
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LOW
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• Frequency < 4 per minute
SHOULDER
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POSTURE & FORCE
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HIGH
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• Elbow above shoulder or behind back
• One-arm push/pull force > 25 lbs
• Support object weighing > 15 lbs at extended reach ("extended reach" defined as > 15", measured horizontally, from shoulder) -
LOW
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• Elbow close to body (< 30°)
• One-arm push/pull force
< 5 lbs
• Support object weighing
< 5 lbs at extended reach
• Frequency < 2 per minute
• Posture duration < 25% of task cycle
REPETITION & DURATION
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HIGH
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• Frequency > 6 per minute
• Posture duration > 50% of task cycle -
LOW
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• Frequency < 2 per minute
• Posture duration < 25% of task cycle
