Purines synchronize perfusion and sweating

This proposed mechanism asks why treated human skin may look youthful at rest yet falter when daily demands arrive in different orders. It proposes that the epidermis, skin’s outer layer, sets timing through purine signals, including adenosine triphosphate (ATP), a molecule that signals outside cells. With controlled heat and nerve input, shifting that timing should move blood flow and sweating together. Rivals predict different patterns: vascular restoration could remove the problem despite altered ATP timing, or separate measures of sweat, surface water and temperature could erase it. Testing requires skin retaining nerves, vessels and glands, and a selective epidermal intervention.