Effects of portable computing devices on posture, muscle activation levels and efficiency

Area of Science:

• Ergonomics
• Human-Computer Interaction
• Occupational Health

Background:

• Limited research exists on ergonomic risks associated with portable computing devices.
• Traditional office ergonomics may not apply to modern portable technology use.
• Understanding posture and performance differences is crucial for user well-being.

Purpose of the Study:

• To quantify differences in muscle activity, posture, and performance across various portable computing devices.
• To compare ergonomic exposures between traditional (desk) and non-traditional (sofa) work settings.
• To assess the impact of device type and work setting on data entry tasks.

Main Methods:

• Twelve participants performed data entry tasks using a laptop, netbook, and slate computer.
• Muscle activity (forearm, neck) and posture (wrist, forearm, neck) were measured.
• Typing speed and error rates were recorded under desk and sofa conditions.

Main Results:

• Slate computers led to significantly more non-neutral wrist, elbow, and neck postures, especially on a sofa.
• Performance (typing speed) on slate computers was four times lower than on laptops or netbooks.
• Lower muscle activity levels were observed with slate computers, despite poorer postures.

Conclusions:

• Using smaller portable computers, particularly slate devices, in non-traditional settings may increase the risk of musculoskeletal injury.
• Ergonomic guidelines should consider the unique challenges posed by diverse portable computing devices and work environments.
• Further research is needed to develop effective strategies for mitigating ergonomic risks in mobile computing.