User discomfort, work posture and muscle activity while using a touchscreen in a desktop PC setting.

Area of Science:

• Ergonomics
• Human-Computer Interaction
• Occupational Health

Background:

• Desktop personal computers (PCs) traditionally use keyboards and mice.
• The integration of touchscreen technology in desktop PCs introduces new interaction methods.
• Understanding the physical implications of touchscreen use in this setting is crucial for user well-being.

Purpose of the Study:

• To evaluate the physical risk factors associated with using a touchscreen on a desktop PC.
• To quantify subjective discomfort, muscle activity, and workstation postures during touchscreen use.
• To compare these factors between traditional (keyboard/mouse), mixed-use (touchscreen/keyboard), and touchscreen-only desktop PC settings.

Main Methods:

• An experimental study involving 24 participants performing standardized computer tasks.
• Quantification of subjective visual/body discomfort ratings.
• Measurement of shoulder and neck muscle myoelectric activity and elbow movement.
• Recording of user-preferred workstation positions.

Main Results:

• Touchscreen use significantly increased subjective discomfort in the shoulder, neck, and fingers.
• Increased myoelectric activity was observed in shoulder and neck muscles.
• A higher percentage of task duration involved arms being held in the air.
• Users positioned touchscreens closer and lower compared to traditional setups.

Conclusions:

• Touchscreen use in desktop PC settings presents significant physical risks.
• Recommendations include implementing more frequent breaks and utilizing armrests.
• Findings can inform design recommendations for ergonomic computer workstations incorporating touch interfaces.