Toward Measuring Cognitive Endurance Capacity: A Proof-of-Principle Study in a Healthy Population

Cognitive performance remained stable or improved over the course of the day, even as subjective fatigue levels increased. Fatigue measures showed limited predictive value for changes in cognitive outcomes, with only subjective fatigue significantly related to performance in one domain. These findings suggest that in healthy working adults, subjective complaints alone do not reliably indicate reduced cognitive functioning. Incorporating objective cognitive data may therefore be important when assessing endurance capacity and informing occupational health evaluations.