{"id":1132,"date":"2024-06-20T19:42:46","date_gmt":"2024-06-20T17:42:46","guid":{"rendered":"https:\/\/kineaphp.fr\/?p=1132"},"modified":"2024-07-08T12:28:30","modified_gmt":"2024-07-08T10:28:30","slug":"9-situations-physiologiques-de-la-respiration","status":"publish","type":"post","link":"https:\/\/kineaphp.fr\/?p=1132","title":{"rendered":"9. Situations physiologiques de la respiration"},"content":{"rendered":"\n<p><strong>Hypoxie d&rsquo;altitude<\/strong><br>En altitude, diminution de la P<sub>ATM<\/sub>, donc diminution de P<sub>02<\/sub><br>A 4800m, la P<sub>ATM<\/sub> est \u00e0 400mmHg.<br><strong>Formule de la pression des gaz alv\u00e9olaires<\/strong> <strong>en altitude<\/strong><br>PA<sub>O2<\/sub> = 21% (P<sub>ATM<\/sub>-47) \u2013 P<sub>CO2<\/sub>\/QR<br>PA<sub>O2<\/sub> = 21%(400-47) \u2013 40\/0,8 = 24mmHg -&gt; impossible pour l\u2019organisme<\/p>\n\n\n\n<p><strong>Adaptation de la respiration en altitude<\/strong><br>&#8211; <strong>L&rsquo;hyperventilation <\/strong>: il s&rsquo;agit d&rsquo;une adaptation <strong>imm\u00e9diate&nbsp;<\/strong>afin de ventiler plus vite et plus fort que la normale pour \u00e9liminer le C02. Donc la valeur de CO2 sanguin va chuter et passe de 40 \u00e0 20. Donc la valeur de PA<sub>02<\/sub> va remonter \u00e0 50mmHg, mais ce n\u2019est pas encore l\u2019id\u00e9al.<br>&#8211; <strong>L&rsquo;acclimatation<\/strong> : m\u00e9canisme d\u2019adaptation <strong>progressif <\/strong>qui se met en place en quelques jours. Le principal m\u00e9canisme d\u2019acclimatation est la polyglobulie (augmentation du taux d\u2019Hb). Il faut optimaliser le CaO2.<\/p>\n\n\n\n<p><strong>Acclimatation et hormone EPO<\/strong><br>Pour rappel :<br>Ca02 = ((Hb x SaO2 x 13,9) + (Pa02 x 0,003)<br>Exemple en altitude<br>15 x 0,85 x 13,9 + 50 x 0,003 = 170ml\/L<br>Si on augmente le taux d\u2019Hb de 15 \u00e0 18, ce qui n\u00e9cessite l\u2019action de l\u2019hormone EPO synth\u00e9tis\u00e9e au niveau des reins, on obtient 200ml\/L<\/p>\n\n\n\n<p><strong>Adaptation du contr\u00f4le c\u00e9r\u00e9bral de la respiration<\/strong><br>Le centre respiratoire est \u00e9galement sensible \u00e0 la chute d\u2019O2 dans le sang. Cela se passe au niveau des carotides que l\u2019hypox\u00e9mie va stimuler le centre respiratoire c\u00e9r\u00e9bral pour cr\u00e9er une hyperventilation.<\/p>\n\n\n\n<p><em>Cet article est un r\u00e9capitulatif de la vid\u00e9o \u00ab\u00a0Respirer en altitude ou en avion: une adaptation \u00e0 l&rsquo;hypoxie\u00a0\u00bb de l&rsquo;Universit\u00e9 catholique de Louvain.<\/em><\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"9. Respirer en altitude ou en avion: une adaptation \u00e0 l&#039;hypoxie\" width=\"925\" height=\"520\" src=\"https:\/\/www.youtube.com\/embed\/xrx7TaWTLrs?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Hypoxie d&rsquo;altitudeEn altitude, diminution de la PATM, donc diminution de P02A 4800m, la PATM est \u00e0 400mmHg.Formule de la pression des gaz alv\u00e9olaires en altitudePAO2 = 21% (PATM-47) \u2013 PCO2\/QRPAO2 = 21%(400-47) \u2013 40\/0,8 =&hellip;<\/p>\n<p class=\"more-link-wrapper\"><a href=\"https:\/\/kineaphp.fr\/?p=1132\" class=\"more-link\">Continue Reading<span class=\"screen-reader-text\"> \u00ab\u00a09. Situations physiologiques de la respiration\u00a0\u00bb<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[150],"tags":[],"class_list":["post-1132","post","type-post","status-publish","format-standard","hentry","category-champ-respi-comprendre-la-respiration"],"_links":{"self":[{"href":"https:\/\/kineaphp.fr\/index.php?rest_route=\/wp\/v2\/posts\/1132","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kineaphp.fr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kineaphp.fr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kineaphp.fr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kineaphp.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1132"}],"version-history":[{"count":2,"href":"https:\/\/kineaphp.fr\/index.php?rest_route=\/wp\/v2\/posts\/1132\/revisions"}],"predecessor-version":[{"id":1220,"href":"https:\/\/kineaphp.fr\/index.php?rest_route=\/wp\/v2\/posts\/1132\/revisions\/1220"}],"wp:attachment":[{"href":"https:\/\/kineaphp.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1132"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kineaphp.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1132"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kineaphp.fr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1132"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}