Differences in Movement Preparation under Hyperthermic Conditions: Self-Initiated Versus Externally Cued Movements

These findings indicate that neural activity for self-initiated movements is preserved under heat stress, whereas neural activity for externally cued movements may be inhibited due to hyperthermia-induced central fatigue, potentially involving brain regions such as the prefrontal cortex. This alteration in the central mechanisms may contribute to the attenuated exercise performance under heat stress.