Effects of Document Holder on Postural Neck Muscles Activity among Computer Users: A Preliminary Study

Area of Science:

• Ergonomics
• Occupational Health
• Biomechanics

Background:

• Prolonged computer use, characterized by repetitive motions and static postures, contributes to work-related neck disorders.
• Simultaneous document viewing and typing are identified as key factors exacerbating neck strain in computer users.

Purpose of the Study:

• To investigate the impact of a document holder on the postural neck muscle activity in computer users.
• To assess the influence of document placement on neck muscle engagement during typing tasks.

Main Methods:

• Surface electromyography (EMG) was employed to analyze neck muscle activity.
• Nine healthy participants performed a 5-minute typing task with and without a document holder in various positions (flat right, flat left, flat center, stand right, stand left).

Main Results:

• A reduction in neck muscle activity was observed when using a document holder compared to not using one.
• However, statistical analysis did not reveal significant differences in muscle activity between the conditions.

Conclusions:

• The use of a document holder may influence head excursion and neck muscle activity.
• Recommendations for utilizing document holders are suggested for individuals with clinical neck pain.