Notebook computer use on a desk, lap and lap support: effects on posture, performance and comfort

Area of Science:

• Ergonomics
• Occupational Health
• Biomechanics

Background:

• Notebook computer use is prevalent in portable configurations.
• Poor posture during computer use is linked to musculoskeletal injuries.
• Understanding ergonomic risks associated with lap-based computing is crucial.

Purpose of the Study:

• To quantify the postures adopted by users when working with a notebook computer on a desk, on their lap, and with a lapdesk.
• To evaluate the impact of a lapdesk on user posture and compare it to traditional desk and lap configurations.
• To identify ergonomic risks associated with different notebook computer usage scenarios.

Main Methods:

• A motion analysis system was employed to measure head, neck, and upper extremity postures.
• Fifteen adult participants were studied across three conditions: desk, lap, and lapdesk.
• Quantitative measurements of joint angles and deviations were recorded during computer use.

Main Results:

• Compared to desk use, lap use increased head tilt and wrist extension, while decreasing shoulder flexion and ulnar deviation.
• The lapdesk reduced head tilt, neck flexion, and wrist extension compared to lap use.
• Despite improvements with the lapdesk, all configurations showed high levels of wrist extension, wrist deviation, and head tilt.

Conclusions:

• Using a notebook computer on the lap significantly alters posture, increasing the risk of musculoskeletal issues.
• A lapdesk offers ergonomic benefits over direct lap use, but does not fully mitigate postural risks.
• Improved usage guidelines are needed to reduce musculoskeletal injury risk during portable notebook computer use.