Effects of static postural loading on the performance of short-term/working memory tasks

Area of Science:

• Ergonomics and Human Factors
• Cognitive Psychology
• Occupational Health

Background:

• Static postural loading is prevalent in many occupations.
• Understanding its impact on cognitive functions is crucial for worker safety and productivity.
• Previous research has not fully elucidated the effects of varied static postures on specific working memory sub-systems.

Purpose of the Study:

• To empirically investigate the effects of static postural loading on short-term/working memory (STM/WM) performance.
• To examine how different magnitudes of postural loading influence visuo-spatial, phonological, and executive functions of WM.
• To assess the impact of specific static postures, categorized by the OWAS scheme, on cognitive task execution.

Main Methods:

• Thirty participants performed three STM/WM tasks (Corsi block-tapping, digit span, 3-back).
• Participants statically held twelve different postures, grouped into four OWAS action categories.
• Cognitive task performance was measured under static postural loading conditions.

Main Results:

• Friedman test revealed statistically significant effects of postural loading on all three STM/WM tasks (p < .001).
• Performance decrements were observed across tasks, indicating a general impact of static posture on cognitive function.
• Specific effects varied depending on the posture and the WM sub-system being tested.

Conclusions:

• Static postural loading demonstrably impairs STM/WM task performance.
• Findings highlight the importance of considering physical-cognitive dual-task situations in occupational settings.
• This research provides empirical evidence for the impact of posture on cognitive load, relevant for ergonomic interventions.