The effect on forearm and shoulder muscle activity in using different slanted computer mice

Area of Science:

• Ergonomics
• Human-Computer Interaction
• Occupational Health

Background:

• Non-slanted computer mice use is linked to musculoskeletal discomfort in forearms and shoulders.
• Ergonomic mice with varying angles may influence forearm and shoulder muscle activity differently.

Purpose of the Study:

• To investigate the impact of different slanted ergonomic mice on forearm and shoulder muscle activity during a text-editing task.

Main Methods:

• Twelve subjects performed a text-editing task using five different slanted mice.
• Surface electromyography recorded muscle activity of extensor carpi ulnaris, extensor digitorum, pronator teres, and upper trapezius.
• Data analyzed using a non-parametric method.

Main Results:

• Increased slanted angles correlated with decreased muscle activity in extensor carpi ulnaris, pronator teres, and upper trapezius.
• Higher slanted angles led to increased wrist extension and greater extensor digitorum muscle activity.

Conclusions:

• Optimal slanted angles in mice promote neutral hand positions.
• Reduced forearm and shoulder muscle activity can decrease the risk of musculoskeletal disorders.