Synchronous activation destabilizes heat loss

This hypothesis asks whether middle-aged adults can lose stable body cooling when neighbouring skin regions release heat together. Restoring youthful blood-flow and sweat responses could otherwise leave temperature control unstable. The proposed mechanism says adjacent regions that widen blood vessels and make sweat normally take turns. Similar activation thresholds could make contiguous patches switch on together, causing larger swings in heat loss. The test would compare simultaneous contiguous activation with an alternating pattern while matching total sweat, blood flow, response delay and activation thresholds. Larger temperature swings in the synchronous pattern would support this spatial mechanism. Stability after reordering at the same average delay would distinguish it from a shared timing mechanism.