Size matters ̶ effect of screen setup on muscle activity and posture in computer work

Area of Science:

• Ergonomics
• Human-Computer Interaction
• Occupational Health

Background:

• Workstation ergonomics significantly impact user comfort and physical well-being.
• Optimizing screen size and viewing distance is crucial for reducing musculoskeletal strain.

Purpose of the Study:

• To compare the effects of five different workstation setups on muscular load, working postures, and perceived exertion.
• To identify the optimal screen configuration and viewing distance for non-presbyopic users.

Main Methods:

• Objective measurement of electrical activity in trapezius neck and shoulder muscles.
• Recording of head and back postures using technical methods.
• Subjective assessment of perceived exertion (neck/shoulder, eyes) and workstation preference.

Main Results:

• The 49-inch curved screen at a 90cm viewing distance was rated best overall, both quantitatively and qualitatively.
• The 49-inch screen setup outperformed configurations using two 27-inch screens.
• A V-formation of two 27-inch screens was preferred over an L-formation setup.

Conclusions:

• A single 49-inch curved monitor at 90cm viewing distance offers superior ergonomic benefits compared to dual 27-inch setups.
• Workstation design, specifically screen size and viewing distance, directly influences physical load and user perception.