Dynamics of seated computer work before and after prolonged constrained sitting.

Area of Science:

• Ergonomics
• Biomechanics
• Human Factors Engineering

Background:

• Prolonged sitting, common in computer work, can lead to discomfort and altered biomechanics.
• Understanding the dynamic changes in postural control during and after constrained sitting is crucial for workplace health.

Purpose of the Study:

• To investigate the effects of prolonged constrained sitting on the dynamics of postural control during seated computer work.
• To assess changes in discomfort, center of pressure (CoP) dynamics, and lumbar curvature (LC) after extended sitting.

Main Methods:

• Nine healthy males performed 5-minute computer tasks before and after 96 minutes of constrained sitting.
• Kinetic and kinematic data, including CoP displacement and LC, were recorded.
• Root mean square, standard deviation, and sample entropy were calculated for CoP and LC signals.

Main Results:

• Buttock discomfort significantly increased after prolonged sitting (p = .02).
• The standard deviation and sample entropy of CoP and LC signals changed significantly, indicating altered sitting dynamics.
• The magnitude of CoP and LC (root mean square) remained unchanged.

Conclusions:

• Prolonged constrained sitting affects the variability and regularity of sitting postural control during computer work.
• These findings challenge the notion of a static, ideal seated posture, emphasizing the importance of dynamic sitting control.