manifestandu-se prin stari de depresie si oboseala. Factorii care determina depresiile estivale fac obiectul unui studiu desfasurat la Institutul National de Sanatate Mintala (NIMH) din Statele Unite. Desi mai rar intalnite decat depresiile de iarna, de care sufera in masura mai mica sau mai mare aproape o treime din populatie, varianta estivala a depresiei afecteaza totusi in jur de 600.000 de persoane in Marea Britanie si este la fel de suparatoare. Multi din cei afectati de aceasta forma de depresie ar face orice pentru a evita soarele si caldura de afara. Boala este insa atat de putin cunoscuta, incat multi nici nu isi dau seama de motivele pentru care le scade moralul pe masura ce se incalzeste vremea. De multe ori, chiar daca pacientii se plang, ei nu sunt luati in serios de medici, subliniaza Amelia Mustapha, de la Depression Alliance.
„Efectele caldurii pot fi similare cu cele ale depresiei”, spune profesorul Thomas Wehr, de la NIMH. „iti pierzi motivatia, ai tendinta sa lenevesti mai mult decat de obicei si ai probleme cu somnul. Depresia de vara poate fi o extrema a reactiei normale a corpului la caldura”, spune acesta.
Nimeni nu stie care sunt cauzele precise ale acestei afectiuni, spune profesorul Norman Rosenthal, psihiatru si specialist in depresie sezoniera de la Universitatea Georgetown. „Se poate sa fie vorba de cantitatea mai mare de lumina sau de cresterea temperaturilor”, spune acesta. Unii cercetatori cred ca este posibil sa existe o predispozitie genetica pentru aceasta boala, deoarece peste doua treimi din cei care sufera de ea au – sau au avut – o ruda suferinda de o boala mintala. Altii cred ca explicatia trebuie cautata in hipotalamus, regiune a creierului care controleaza activitatea hormonilor. Pentru ca functionarea acestuia e legata de senzori de temperatura, anumite mecanisme cerebrale ar putea fi afectate de venirea caldurii, explica sustinatorii acestei teorii.
Profesorul Wehr a demonstrat experimental ca celor care sunt afectati de aceasta forma de depresie le creste temperatura corpului in timpul noptii mai mult decat persoanelor sanatoase. „Cand pacientii care sufera de depresie au fost infasurati in timpul noptii in paturi, astfel incat li s-a redus putin temperatura, simptomele s-au calmat”, spune profesorul Wehr. „Imediat ce au iesit afara in caldura verii, depresia a revenit”.
Potrivit profesorului Rosenthal, depresia estivala poate fi combatuta cu masuri simple, precum instalarea de obloane sau draperii, pentru a bloca lumina si lasarea ferestrelor deschise in timpul noptii atunci cand vremea se incalzeste.
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