Can a smartwatch spot mental fatigue before it slows you down?

This study aims to see if wearable sensors can detect mental fatigue in real time and predict how it affects running performance. Researchers will recruit 30 healthy, trained runners aged 18-35. Participants will complete a mentally tiring task or watch a documentary, then run a 5-kilometer time trial while wearing sensors that measure heart rate, breathing, and eye movements. The goal is to develop an objective way to monitor mental fatigue without relying on self-reports or lab equipment.