Da anziani il sonno peggiora per via delle ipocretine?
Potrebbero essere le ipocretine, sostanze prodotte da un ristretto numero di neuroni dell’ipotalamo, le “responsabili” del sonno meno soddisfacente che, in molte persone, si verifica una volta diventati anziani. I ricercatori della Stanford University (Stati Uniti) hanno condotto uno studio sui topi, rilevando che quelli anziani ne avevano circa il 38% in meno in confronto a quelli giovani. Quelle rimaste negli esemplari anziani si attivavano poi più facilmente, favorendo così il risveglio. La causa di ciò? Secondo gli scienziati potrebbe essere la ridotta funzionalità, connessa all’età avanzata, dei “canali del potassio”, che attivano e disattivano numerosi tipi di cellule. (foto www.pixabay.com)
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