Approach strategy and working posture in manual hand tool operation

Area of Science:

• Ergonomics and Human Factors
• Biomechanics
• Human-Computer Interaction

Background:

• Understanding goal-directed task approaches is crucial for ergonomics.
• Limited research exists on human strategies for approaching manual work positions.
• Optimizing work position approach and posture is key for efficiency and safety.

Purpose of the Study:

• To describe and understand strategies for approaching manual work positions from various directions.
• To describe working postures adopted when operating hand tools at different heights.
• To inform digital human modeling for realistic human movement simulation.

Main Methods:

• An experiment with eight participants was conducted.
• Measured whole-body position and orientation during approach from five directions.
• Examined working postures during pistol-grip hand tool operation at six heights.

Main Results:

• Approach direction significantly affected final whole-body position and orientation.
• A linear relationship was found between approach direction and final orientation.
• Working posture was significantly influenced by working height, with distinct postures for different height ranges.

Conclusions:

• Participants employed a combined efficiency and comfort strategy when approaching work positions.
• Work position approach involves deviation from straight paths and whole-body reorientation.
• Defined standing, stooping, and squatting postures based on working height for tool operation.