After a long day of meetings, emails, and decisions, a bike ride can feel surprisingly grueling—even though your legs have not gotten any weaker. That disconnect is the subject of research by Benjamin Pageaux, a professor at Université de Montréal's School of Kinesiology and Physical Education, as reported by Medical Xpress.
The work points to mental fatigue as a key factor in perceived exertion. When the brain is tired from cognitive tasks, it may make the body's physical efforts seem more demanding, potentially reducing endurance even when muscle strength is unchanged. This could matter for athletes, but also for anyone whose job combines mental strain with physical activity.
The report does not provide details on the experimental design or sample size, so the findings should be interpreted as an early look at the brain-endurance link. Still, it highlights a growing area of research into how mental state shapes physical performance.