Boosting arousal and cognitive performance through alternating posture: Insights from a multi-method laboratory study

Area of Science:

• Cognitive Neuroscience
• Human Physiology
• Ergonomics

Background:

• Prolonged sitting is linked to mental fatigue and decreased arousal.
• Sit-stand desks offer a potential solution to mitigate sedentary behavior's negative effects.
• Understanding the interplay of arousal, effort, and cognitive function during posture changes is crucial.

Purpose of the Study:

• To investigate the cognitive benefits of alternating sitting and standing postures.
• To examine the roles of arousal and effort costs in these benefits.
• To assess the impact on executive functions, physiology, and neural activity.

Main Methods:

• A 2-hour laboratory study with 43 participants using a sit-stand desk.
• Two sessions: one alternating postures (20-min blocks), one seated.
• Measurements included executive functions (inhibition, switching, updating), self-reports, physiological signals, and neural activity (alpha oscillations).

Main Results:

• Time-on-task increased mental fatigue and decreased arousal.
• Standing acutely increased arousal (self-reports, alpha oscillations, cardiac responses) and decreased effort costs.
• Standing enhanced processing speed, linked to faster evidence accumulation and reduced non-decision time.
• Alternating postures cumulatively increased heart rate variability.

Conclusions:

• Alternating sitting and standing postures enhances arousal and reduces perceived effort.
• Posture changes can improve specific cognitive functions like processing speed.
• Findings suggest that sit-stand workstations can positively impact cognitive and physiological well-being.