{"id":23413,"date":"2015-11-08T10:05:56","date_gmt":"2015-11-08T09:05:56","guid":{"rendered":"http:\/\/www.invarena.cz\/?p=23413"},"modified":"2015-11-08T10:05:56","modified_gmt":"2015-11-08T09:05:56","slug":"corriere-della-sera-proc-kava-narusuje-spanek","status":"publish","type":"post","link":"https:\/\/www.invarena.cz\/?p=23413","title":{"rendered":"Corriere della Sera: Pro\u010d k\u00e1va naru\u0161uje sp\u00e1nek"},"content":{"rendered":"

P\u0159\u00edm\u00e9 i nep\u0159\u00edm\u00e9 d\u016fvody, pro\u010d je n\u00e1pad d\u00e1t si k\u00e1vu p\u0159ed span\u00edm zcela \u0161patn\u00fd, jsou mnoh\u00e9. Podrobn\u011b je vysv\u011btluje v\u00fdzkum laborato\u0159e molekul\u00e1rn\u00ed biologie Centra pro l\u00e9ka\u0159sk\u00fd v\u00fdzkum v Cambridgi. O v\u00fdzkumu p\u00ed\u0161e italsk\u00fd den\u00edk Corriere della Sera.<\/strong><\/p>\n


\nfoto: David Leo Veksler \/ Flickr.com<\/p>\n

Kofein m\u011bn\u00ed na\u0161e vnit\u0159n\u00ed hodiny. K takov\u00e9mu z\u00e1v\u011bru dosp\u011bli brit\u0161t\u00ed v\u011bdci, kte\u0159\u00ed kultivovali bu\u0148ky, vystavovali je p\u016fsoben\u00ed kofeinu a p\u0159itom sledovali jejich reakce. Podle jejich z\u00e1v\u011br\u016f je kofein z\u0159ejm\u011b schopen zm\u011bnit biologick\u00e9 hodiny ka\u017ed\u00e9 bu\u0148ky organismu.<\/p>\n

Kofein je mnohem v\u00edce ne\u017e stimulant. Dvojit\u00e9 espresso, kter\u00e9 si vypijete t\u0159i hodiny p\u0159ed span\u00edm, zpomal\u00ed produkci hormonu melatoninu, kter\u00fd ovliv\u0148uje sp\u00e1nek, asi o 40 minut.<\/p>\n

Jin\u00e1 studie americk\u00e9 st\u00e1tn\u00ed univerzity v Boulderu ve st\u00e1t\u011b Colorado vypov\u00edd\u00e1 o tom, \u017ee k\u00e1va p\u016fsob\u00ed stejn\u011b, jako bychom se ve chv\u00edli, kdy se ukl\u00e1d\u00e1me ke sp\u00e1nku, vystavovali t\u0159i hodiny um\u011bl\u00e9mu sv\u011btlu. I v tomto p\u0159\u00edpad\u011b se n\u00e1stup sp\u00e1nku zpo\u017e\u010fuje o 40 minut. Jestli\u017ee tedy chcete ve\u010der usnout v b\u011b\u017enou dobu, jak jste zvykl\u00ed, ned\u00e1vejte si k\u00e1vu po 17. hodin\u011b.<\/p>\n

Vysok\u00e1 d\u00e1vka kofeinu, tedy dva a\u017e t\u0159i \u0161\u00e1lky k\u00e1vy, p\u0159ed span\u00edm m\u00e1 stejn\u00fd efekt jet lag (porucha sp\u00e1nku plynouc\u00ed z naru\u0161en\u00ed biorytm\u016f po rychl\u00e9m leteck\u00e9m p\u0159ekon\u00e1n\u00ed n\u011bkolika \u010dasov\u00fdch p\u00e1sem), zpomaluje biologick\u00e9 hodiny a oklame mozek tak, \u017ee se domn\u00edv\u00e1, \u017ee je o hodinu pozadu za skute\u010dn\u00fdm \u010dasem.<\/p>\n

Pom\u00fdlen\u00e9 biologick\u00e9 hodiny zvy\u0161uj\u00ed riziko cel\u00e9 \u0159ady chorob, po\u010d\u00ednaje rakovinou, srde\u010dn\u00edmi nemocemi a kon\u010de cukrovkou. Je mo\u017en\u00e9 konstatovat, \u017ee nevhodn\u00e1 konzumace k\u00e1vy, tedy pijeme-li ji p\u0159\u00edli\u0161 pozd\u011b ve\u010der a ve v\u011bt\u0161\u00edm mno\u017estv\u00ed, naru\u0161uje sp\u00e1nek a m\u016f\u017ee zp\u016fsobit \u010detn\u00e9 zdravotn\u00ed probl\u00e9my.<\/p>\n

Pop\u00edjen\u00ed k\u00e1vy nelze \u0161mahem ozna\u010dit za \u0161patn\u00fd zvyk, ale z\u00e1sadn\u011b se nedoporu\u010duje p\u00edt ji ve\u010der, zejm\u00e9na kv\u016fli negativn\u00edmu vlivu na syst\u00e9m sp\u00e1nku a bd\u011blosti.<\/p>\n

Derk Jan Dijk z Univerzity v Surrey v anglick\u00e9m m\u011bst\u011b Guildford zd\u016fraz\u0148uje, \u017ee citlivost v\u016f\u010di kofeinu je velmi individu\u00e1ln\u00ed. Kdo je tedy zvl\u00e1\u0161t\u011b citliv\u00fd na kofein, nem\u011bl by p\u00edt k\u00e1vu u\u017e ani odpoledne.<\/p>\n

K\u00e1vu doprov\u00e1z\u00ed mnoho pov\u011bst\u00ed, z nich\u017e v\u011bt\u0161ina je nepravdiv\u00fdch. Je nepochybn\u00e9, \u017ee v ur\u010dit\u00fdch d\u00e1vk\u00e1ch m\u016f\u017ee negativn\u011b ovlivnit srde\u010dn\u00ed rytmus. Chronick\u00fd nedostatek sp\u00e1nku zp\u016fsoben\u00fd ve\u010dern\u00edm pop\u00edjen\u00edm k\u00e1vy m\u016f\u017ee m\u00edt negativn\u00ed dopad na lidsk\u00e9 zdrav\u00ed. Nicm\u00e9n\u011b \u0161\u00e1lek k\u00e1vy po r\u00e1nu m\u016f\u017ee b\u00fdt prosp\u011b\u0161n\u00fd. Pokud tedy jde o pop\u00edjen\u00ed k\u00e1vy, pou\u017e\u00edvejme zdrav\u00fd rozum.<\/p>\n","protected":false},"excerpt":{"rendered":"

P\u0159\u00edm\u00e9 i nep\u0159\u00edm\u00e9 d\u016fvody, pro\u010d je n\u00e1pad d\u00e1t si k\u00e1vu p\u0159ed span\u00edm zcela \u0161patn\u00fd, jsou mnoh\u00e9. Podrobn\u011b je vysv\u011btluje v\u00fdzkum laborato\u0159e molekul\u00e1rn\u00ed biologie Centra pro […]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":18163,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-23413","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-zdravi"],"_links":{"self":[{"href":"https:\/\/www.invarena.cz\/index.php?rest_route=\/wp\/v2\/posts\/23413","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.invarena.cz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.invarena.cz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.invarena.cz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.invarena.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=23413"}],"version-history":[{"count":0,"href":"https:\/\/www.invarena.cz\/index.php?rest_route=\/wp\/v2\/posts\/23413\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.invarena.cz\/index.php?rest_route=\/wp\/v2\/media\/18163"}],"wp:attachment":[{"href":"https:\/\/www.invarena.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=23413"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.invarena.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=23413"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.invarena.cz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=23413"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}