{"id":11385552,"date":"2009-01-15T00:00:00","date_gmt":"2009-01-14T23:00:00","guid":{"rendered":"https:\/\/alertdiver.eu\/uncategorized-cs_cz\/jev-p\/"},"modified":"2009-01-15T00:00:00","modified_gmt":"2009-01-14T23:00:00","slug":"jev-p","status":"publish","type":"post","link":"https:\/\/alertdiver.eu\/cs_CZ\/clanky\/jev-p\/","title":{"rendered":"Jev &#8218;P&#8216;"},"content":{"rendered":"<p style=\"text-align: justify;\">&quot;James Crook z Long Acre trp\u011bl vodnatelnost\u00ed a \u017elu\u010dovitost\u00ed, m\u011bl t\u0159esavku, revma a st\u00e1l\u00e9 bolesti zad. Po t\u0159ech ponorech se otok jeho nohou zmen\u0161il, takt\u00e9\u017e bolesti zad a \u017elu\u010dovitost, z nosu smrkal hodn\u011b odporn\u00e9ho \u017elut\u00e9ho hnisu. Z mno\u017estv\u00ed a s\u00edly jeho proudu m\u016f\u017eeme \u0159\u00edci, \u017ee toho vymo\u010dil v\u00edce ne\u017e vypil.&quot;<br \/> &nbsp;<\/p>\n<p style=\"text-align: justify;\">A. Sutherland, 1764<\/p>\n<p style=\"text-align: justify;\"> <strong>Co se to vlastn\u011b d\u011bje?<\/strong><br \/> Kdy\u017e se pot\u00e1p\u00edte, plavete nebo se jen pono\u0159\u00edte do vany, mus\u00edte &ldquo;si odsko\u010dit&rdquo;. Tomuto zv\u00fd\u0161en\u00e9mu v\u00fddeji mo\u010di se \u0159\u00edk\u00e1 &ldquo;jev P&rdquo;, jinak tak\u00e9 ponorn\u00e1 diur\u00e9za. Obvykle se to vysv\u011btluje t\u00edm, \u017ee voda p\u0159i ponoru vytla\u010duje krev z nohou do hrudn\u00edku. Srdce tento n\u00e1r\u016fst registruje a aby se vy\u0161\u0161\u00ed objem tekutiny v hrudn\u00edku &ldquo;normalizoval&rdquo;, vyd\u00e1 sign\u00e1l t\u011blu, aby se n\u011bjak\u00e9ho mno\u017estv\u00ed tekutiny zbavilo.<br \/> Ale posun tekutiny z nohou na vysv\u011btlen\u00ed tohoto jevu nesta\u010d\u00ed. P\u0159i v\u00fdzkumu porovn\u00e1vaj\u00edc\u00edm jedince bez obou nohou (po amputaci) s jedinci bez amputace se zjistilo, \u017ee objem nohou p\u0159isp\u00edv\u00e1 jen \u010d\u00e1ste\u010dn\u011b. D\u00e1 se to tak\u00e9 dok\u00e1zat stojem na hlav\u011b nebo le\u017een\u00edm na z\u00e1dech s nohama ve zv\u00fd\u0161en\u00e9 poloze. Krev se z nohou p\u0159esouv\u00e1, ale bez pr\u016fvodn\u00ed diur\u00e9zy. Co se tedy vlastn\u011b d\u011bje?<br \/> &nbsp;<\/p>\n<p style=\"text-align: justify;\"><strong>Mechanick\u00e9 faktory<\/strong><br \/> Poloha. Kdy\u017e se pono\u0159\u00edte do vody a\u017e po krk, nast\u00e1v\u00e1 siln\u011bj\u0161\u00ed diur\u00e9za, ne\u017e kdy\u017e jste ve vod\u011b jen po p\u00e1s. N\u011bkdo se myln\u011b domn\u00edv\u00e1, \u017ee kdy\u017e tlak stoup\u00e1 s hloubkou, tak vy\u0161\u0161\u00ed tlak vody na nohy ne\u017e na horn\u00ed \u010d\u00e1st t\u011bla vytla\u010duje krev sm\u011brem vzh\u016fru.<br \/> Ale k diur\u00e9ze doch\u00e1z\u00ed, i kdy\u017e je \u010dlov\u011bk ve vod\u011b v horizont\u00e1ln\u00ed poloze, jako\u017e i b\u011bhem mikrop\u0159ita\u017elivosti p\u0159i vesm\u00edrn\u00e9m letu, co\u017e jsou dv\u011b situace, kdy na hlavu a nohy p\u016fsob\u00ed naprosto stejn\u00fd tlak. A diur\u00e9za nast\u00e1v\u00e1 i pod vodou v poloze vzh\u016fru nohama, kde je (hydrostatick\u00fd ) rozd\u00edl tlaku dokonce opa\u010dn\u00fd. A krev nen\u00ed vytla\u010dov\u00e1na do nohou. \u010c\u00edm je to tedy zp\u016fsobeno? <br \/>&nbsp;<\/p>\n<p style=\"text-align: justify;\">P\u0159ita\u017elivost. Kdy\u017e le\u017e\u00edte ve vodorovn\u00e9 poloze na sou\u0161i, je krevn\u00ed tlak v pa\u017e\u00edch a nohou v\u00edcem\u00e9n\u011b stejn\u00fd. Kdy\u017e se v\u0161ak postav\u00edte, zv\u00fd\u0161\u00ed se tlak v nohou n\u00e1sledkem v\u00e1hy krve v horn\u00ed \u010d\u00e1sti krevn\u00edho \u0159e\u010di\u0161t\u011b. V noh\u00e1ch se zadr\u017euje o n\u011bco v\u00edce krve n\u00e1sledkem p\u0159ita\u017elivosti a tak\u00e9 proto, \u017ee \u017e\u00edly (sp\u00ed\u0161e ne\u017e c\u00e9vy) se roztahuj\u00ed a poj\u00edmaj\u00ed krve v\u00edce. D\u00edky tomu se dost\u00e1v\u00e1 m\u00e9n\u011b krve do srdce.<\/p>\n<p style=\"text-align: justify;\">Kdy\u017e se pono\u0159\u00edte do vody, \u00fa\u010dinky na objem krve jsou kv\u016fli vzpl\u00fdvavosti\/vznosnoti t\u00e9m\u011b\u0159 p\u0159esn\u011b opa\u010dn\u00e9. Toto vyrovn\u00e1v\u00e1n\u00ed tlaku (ale ne stla\u010dov\u00e1n\u00edm vodou) zvy\u0161uje objem krve v hrudn\u00edku a tak\u00e9 diur\u00e9zu. Ve vesm\u00edru je tah p\u0159ita\u017elivost slab\u00fd a tato skute\u010dnost &#8211; stejn\u011b jako vzpl\u00fdvavost ve vod\u011b &#8211; p\u016fsob\u00ed na krevn\u00ed tlak opa\u010dn\u011b. Ve vesm\u00edru se krev v noh\u00e1ch nehromad\u00ed. Astronaut\u00e9 a v\u011bdci z \u0159\u00edd\u00edc\u00edho st\u0159ediska kosmick\u00fdch let\u016f pou\u017e\u00edvaj\u00ed pro tento p\u0159esun vy\u0161\u0161\u00edho objemu tekutin sm\u011brem k hlav\u011b b\u011bhem letu do vesm\u00edru speci\u00e1ln\u00ed term\u00edn &#8211; &ldquo;efekt tlust\u00e9 tv\u00e1\u0159e a ku\u0159ec\u00edch nohou&rdquo;.<\/p>\n<p style=\"text-align: justify;\">Negativn\u00ed tlak. Kdy\u017e jste a\u017e po krk ve vod\u011b, je tlak vzduchu v \u00fastech ni\u017e\u0161\u00ed ne\u017e tlak vody na hrudn\u00edk. V takov\u00e9m p\u0159\u00edpad\u011b je k vdechov\u00e1n\u00ed pot\u0159eba ur\u010dit\u00e9ho \u00fasil\u00ed, asi jako p\u0159i pit\u00ed br\u010dkem. D\u00fdch\u00e1n\u00ed proti tomuto ni\u017e\u0161\u00edmu tlaku se \u0159\u00edk\u00e1 d\u00fdch\u00e1n\u00ed p\u0159i negativn\u00edm tlaku. P\u0159itom se d\u011bje n\u011bkolik v\u011bc\u00ed. Pat\u0159\u00ed k nim tak\u00e9 mal\u00e9 mno\u017estv\u00ed krve &ldquo;vtahovan\u00e9&rdquo; do hrudn\u00edku a slab\u00e1 (n\u011bkdy \u017e\u00e1dn\u00e1) diur\u00e9za. Pod vodou dod\u00e1v\u00e1 p\u0159\u00edstrojov\u00fd regul\u00e1tor vzduch t\u00e9m\u011b\u0159 o stejn\u00e9m tlaku, jak\u00fd m\u00e1 okoln\u00ed voda a nez\u00e1le\u017e\u00ed na tom, je-li pot\u00e1p\u011b\u010d hlavou vzh\u016fru nebo dol\u016f. Ale k ur\u010dit\u00fdm rozd\u00edl\u016fm zde p\u0159esto doch\u00e1z\u00ed, p\u0159i\u010dem\u017e se d\u00fdch\u00e1n\u00ed st\u00e1le m\u011bn\u00ed, a sice z d\u00fdch\u00e1n\u00ed p\u0159i m\u00edrn\u011b negativn\u00edm tlaku v d\u00fdch\u00e1n\u00ed p\u0159i m\u00edrn\u011b pozitivn\u00edm tlaku a naopak &ndash; co\u017e nepravideln\u011b posouv\u00e1 objem krve jedn\u00edm \u010di druh\u00fdm sm\u011brem.<br \/> &nbsp;<\/p>\n<p style=\"text-align: justify;\"><strong>Chemick\u00e9 faktory<\/strong><br \/> Soust\u0159e\u010fov\u00e1n\u00ed krve do st\u0159edu t\u011bla b\u011bhem ponoru stimuluje t\u011blo k uvol\u0148ov\u00e1n\u00ed zaj\u00edmav\u00fdch chemick\u00fdch l\u00e1tek, kter\u00e9 zp\u016fsobuj\u00ed a reguluj\u00ed diur\u00e9zu, vym\u011b\u0161ov\u00e1n\u00ed sod\u00edku (tomu se \u0159\u00edk\u00e1 natriur\u00e9za) a pota\u0161e (odborn\u00fd term\u00edn: kaliur\u00e9za).&nbsp; Jednou z hlavn\u00edch chemick\u00fdch l\u00e1tek, kter\u00e1 \u0159\u00edd\u00ed v\u00fddej tekutin, je hormon vazopresin. Jednou z funkc\u00ed vazopresinu je sni\u017eovat mno\u017estv\u00ed v\u00fddeje mo\u010di. Vazopresinu se tak\u00e9 b\u011b\u017en\u011b \u0159\u00edk\u00e1 antidiuretick\u00fd hormon (ADH). ADH je pro \u017eivot d\u016fle\u017eit\u00fd, zaji\u0161\u0165uje toti\u017e, aby \u010dlov\u011bk tzv. &ldquo;nevysychal&rdquo;. Pot\u00e1p\u011bn\u00ed \u00fa\u010dinky tohoto hormonu potla\u010duje. V\u00fddej mo\u010di se zvy\u0161uje, alespo\u0148 do\u010dasn\u011b. Dal\u0161\u00ed zn\u00e1m\u00fd zp\u016fsob, jak\u00fdm se potla\u010duje \u00fa\u010dinek ADH, je p\u0159\u00edjem siln\u00e9ho alkoholu.<\/p>\n<p style=\"text-align: justify;\">Je\u0161t\u011b d\u016fle\u017eit\u011bj\u0161\u00ed chemickou l\u00e1tkou p\u0159i jevu &ldquo;P&rdquo; je ANF. Kdy\u017e se p\u0159i ponoru zvy\u0161uje objem krve sm\u011brem do st\u0159edu t\u011bla, horn\u00ed komory srdce (atrie) se kv\u016fli tomuto vy\u0161\u0161\u00edmu objemu krve roztahuj\u00ed. Aby se vy\u0161\u0161\u00ed objem krve sn\u00ed\u017eil, vylu\u010duj\u00ed bu\u0148ky atri\u00ed l\u00e1tku, kter\u00e1 zvy\u0161uje diur\u00e9zu, potla\u010duje \u017e\u00edze\u0148, zvy\u0161uje natriur\u00e9zu a uvol\u0148uje celou \u0159adu chemick\u00fdch l\u00e1tek pro dosa\u017een\u00ed p\u016fvodn\u00ed rovnov\u00e1hy. Proto\u017ee k vylu\u010dov\u00e1n\u00ed doch\u00e1z\u00ed v atri\u00edch a je hlavn\u00edm faktorem p\u0159i natriur\u00e9ze, \u0159\u00edk\u00e1 se tomuto jevu atri\u00e1ln\u00ed natriuretick\u00fd faktor, neboli ANF. ANF je zvl\u00e1\u0161tn\u00ed druh b\u00edlkovinn\u00e9 molekuly zn\u00e1m\u00e9 jako peptid (n\u011bkdy se j\u00ed \u0159\u00edk\u00e1 atri\u00e1ln\u00ed natriuretick\u00fd peptid = ANP).<\/p>\n<p style=\"text-align: justify;\"><strong>Faktory okoln\u00edho prost\u0159ed\u00ed<\/strong><br \/> Diur\u00e9za je vy\u0161\u0161\u00ed b\u011bhem dne ne\u017e v noci, co\u017e \u010dlov\u011bku napom\u00e1h\u00e1 v noci se vyspat (to plat\u00ed i pro pot\u00e1p\u011bn\u00ed ve dne nebo v noci). Slan\u00e1 voda, kter\u00e1 m\u00e1 v\u011bt\u0161\u00ed hustotu ne\u017e vnitrozemsk\u00e1 voda, m\u00edrn\u011b zvy\u0161uje vzpl\u00fdvavost\/vznosnot a tak\u00e9 diuretick\u00fd \u00fa\u010dinek posunu kapaliny. To jsou ale m\u00e9n\u011b d\u016fle\u017eit\u00e9 faktory. <br \/> P\u0159i studen\u00e9m ponoru se \u017e\u00edly i c\u00e9vy v kon\u010detin\u00e1ch stahuj\u00ed, aby se sn\u00ed\u017eila ztr\u00e1ta tepla. Krev se p\u0159esouv\u00e1 do st\u0159edu t\u011bla a \u010dlov\u011bk c\u00edt\u00ed nal\u00e9havou pot\u0159ebu. V tepl\u00e9 a hork\u00e9 vod\u011b (nap\u0159. ve van\u011b s teplou vodou) k takov\u00e9 diur\u00e9ze nedoch\u00e1z\u00ed, ale p\u0159esto existuje i tam, a sice a\u017e do doby, kdy se t\u011blo dostate\u010dn\u011b zah\u0159eje a krevn\u00ed \u0159e\u010di\u0161t\u011b p\u0159esouv\u00e1 krev z centra do kon\u010detin, aby se sn\u00ed\u017eila teplota. Chlad je tak d\u016fle\u017eit\u00fdm faktorem, \u017ee jeho \u00fa\u010dinek \u010dlov\u011bk poc\u00edt\u00ed okam\u017eit\u011b nap\u0159. p\u0159i vstupu pod studenou sprchu bez jak\u00e9hokoliv pot\u00e1p\u011bn\u00ed.<\/p>\n<p style=\"text-align: justify;\"><strong>Osobn\u00ed faktory<\/strong><br \/> Fyzick\u00e1 cvi\u010den\u00ed sni\u017euj\u00ed diur\u00e9zi prost\u0159ednictv\u00edm cel\u00e9 \u0159ady reakc\u00ed. K siln\u011bj\u0161\u00ed a rychlej\u0161\u00ed diur\u00e9zi doch\u00e1z\u00ed u star\u0161\u00edch lid\u00ed (ve v\u011bku od 62 do 74 let) oproti mlad\u0161\u00ed generaci (21 a\u017e 28 let), co\u017e je experiment\u00e1ln\u011b prok\u00e1z\u00e1no &ndash; je tomu tak i p\u0159i stejn\u00e9 hloubce ponoru a dokonce i p\u0159i stejn\u00e9m p\u0159esunu krve do st\u0159edu t\u011bla. Tak\u00e9 p\u0159i strachu, \u00fazkosti a emo\u010dn\u00edm nap\u011bt\u00ed se vys\u00edlaj\u00ed dal\u0161\u00ed nervov\u00e9 sign\u00e1ly do ledvin, co\u017e m\u00e1 za n\u00e1sledek siln\u011bj\u0161\u00ed diur\u00e9zi.<\/p>\n<p style=\"text-align: justify;\"><strong>Nezn\u00e1m\u00e9 faktory<\/strong><br \/> I kdy\u017e se diur\u00e9za nem\u011bn\u00ed s hloubkou, zvy\u0161uje se v such\u00fdch hyperbarick\u00fdch komor\u00e1ch p\u0159i pokusech na hlubokou saturaci. Nev\u00ed se p\u0159esn\u011b, pro\u010d k tomu doch\u00e1z\u00ed, ale mo\u017en\u00e1 to je zp\u016fsobeno vy\u0161\u0161\u00edm tlakem i hustotou plyn\u016f a ni\u017e\u0161\u00ed ztr\u00e1tou vody skrze poko\u017eku. T\u011blo si nach\u00e1z\u00ed alternativn\u00ed zp\u016fsob, jak se zbavit vody.<\/p>\n<p style=\"text-align: justify;\"><strong>M\u00fdtus kolem jevu &ldquo;P&rdquo;<\/strong><br \/> Nen\u00ed pravda, \u017ee kdy\u017e se vlo\u017e\u00ed ruka sp\u00edc\u00edho \u010dlov\u011bka do vody (jak\u00e9koliv teploty), vyvol\u00e1 to b\u011bhem sp\u00e1nku jev &ldquo;P&rdquo;, tedy \u017ee si &ldquo;odsko\u010d\u00ed&rdquo;.<\/p>\n<p style=\"text-align: justify;\"><strong>Shrnut\u00ed<\/strong><br \/> Pot\u00e1p\u011bn\u00ed nen\u00ed jedinou p\u0159\u00ed\u010dinou vy\u0161\u0161\u00ed diur\u00e9zy, d\u016fvod\u016f je v\u00edce. Souhrn mechanick\u00fdch, nervov\u00fdch, okoln\u00edch a chemick\u00fdch vliv\u016f \u0159\u00edd\u00ed a reguluje objem tekutin v t\u011ble na z\u00e1klad\u011b reakc\u00ed na nejr\u016fzn\u011bj\u0161\u00ed podn\u011bty. Na druhou stranu jednodu\u0161e plat\u00ed, &ldquo;kdy\u017e mus\u00ed\u0161, tak mus\u00ed\u0161&rdquo;.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&quot;James Crook z Long Acre trp\u011bl vodnatelnost\u00ed a \u017elu\u010dovitost\u00ed, m\u011bl t\u0159esavku, revma a st\u00e1l\u00e9 bolesti zad. Po t\u0159ech ponorech se otok jeho nohou zmen\u0161il, takt\u00e9\u017e&#8230;<\/p>\n","protected":false},"author":1,"featured_media":11374072,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[384],"tags":[],"authors":[1227],"class_list":["post-11385552","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-clanky","authors-jolie-bookspan-cs_cz"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Jev &#039;P&#039; - Alert Diver<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/alertdiver.eu\/cs_CZ\/clanky\/jev-p\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Jev &#039;P&#039; - Alert Diver\" \/>\n<meta property=\"og:description\" content=\"&quot;James Crook z Long Acre trp\u011bl vodnatelnost\u00ed a \u017elu\u010dovitost\u00ed, m\u011bl t\u0159esavku, revma a st\u00e1l\u00e9 bolesti zad. 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