{"id":58751,"date":"2018-11-05T12:03:10","date_gmt":"2018-11-05T20:03:10","guid":{"rendered":"https:\/\/www.chronobiology.com\/discovered-new-link-between-circadian-rhythm-and-aggression\/"},"modified":"2024-07-18T14:58:52","modified_gmt":"2024-07-18T21:58:52","slug":"d-couverte-nouveau-lien-entre-le-rythme-circadien-et-l-agressivit","status":"publish","type":"post","link":"https:\/\/dev.chronobiology.com\/fr\/d-couverte-nouveau-lien-entre-le-rythme-circadien-et-l-agressivit\/","title":{"rendered":"D\u00e9couverte : Nouveau lien entre le rythme circadien et l&rsquo;agressivit\u00e9"},"content":{"rendered":"<p>La d\u00e9mence est l&rsquo;une des maladies les plus r\u00e9pandues dans le monde, <a href=\"https:\/\/www.news-medical.net\/health\/What-is-Dementia.aspx\" target=\"_blank\" rel=\"noopener noreferrer\">une personne sur trois<\/a> en souffrant sous une forme ou une autre avant de mourir. Outre la perte des capacit\u00e9s cognitives et de la m\u00e9moire, les personnes atteintes de d\u00e9mence souffrent souvent de sautes d&rsquo;humeur et de changements de comportement. L&rsquo;un des changements de comportement les plus courants chez les personnes atteintes de d\u00e9mence est un ph\u00e9nom\u00e8ne connu sous le nom de \u00ab\u00a0sundowning\u00a0\u00bb (coucher de soleil), qui se traduit par une confusion et une agressivit\u00e9 croissantes pendant la nuit. Selon de nouvelles recherches, le <a href=\"https:\/\/www.chronobiology.com\/how-chronobiology-is-impacting-alzheimers-and-dementia-treatment\/\" target=\"_blank\" rel=\"noopener noreferrer\">rythme circadien pourrait \u00eatre la cl\u00e9<\/a> d&rsquo;un traitement efficace de ce comportement, afin que les personnes atteintes de d\u00e9mence puissent b\u00e9n\u00e9ficier du sommeil paisible dont elles ont besoin.<\/p>\n<h2>D\u00e9mence, agressivit\u00e9 et coucher du soleil<a href=\"https:\/\/www.chronobiology.com\/wp-content\/uploads\/2018\/11\/discovered-new-link-between-circadian-rhythm-and-aggression-3.jpg\"><img decoding=\"async\" class=\"size-medium wp-image-27583 alignright\" title=\"Discovered: New Link Between Circadian Rhythm and Aggression 2\" src=\"https:\/\/www.chronobiology.com\/wp-content\/uploads\/2018\/11\/discovered-new-link-between-circadian-rhythm-and-aggression-3-300x206.jpg\" alt=\"Discovered: New Link Between Circadian Rhythm and Aggression 2\" width=\"300\" height=\"206\" srcset=\"https:\/\/dev.chronobiology.com\/wp-content\/uploads\/2018\/11\/discovered-new-link-between-circadian-rhythm-and-aggression-3-300x206.jpg 300w, https:\/\/dev.chronobiology.com\/wp-content\/uploads\/2018\/11\/discovered-new-link-between-circadian-rhythm-and-aggression-3-768x528.jpg 768w, https:\/\/dev.chronobiology.com\/wp-content\/uploads\/2018\/11\/discovered-new-link-between-circadian-rhythm-and-aggression-3.jpg 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/h2>\n<p>La d\u00e9mence reste l&rsquo;une des maladies les plus redout\u00e9es au monde et l&rsquo;une des plus difficiles \u00e0 traiter. Cette maladie tr\u00e8s r\u00e9pandue laisse de nombreuses personnes dans le monde entier passer leur \u00e2ge d&rsquo;or dans la confusion et le d\u00e9clin cognitif. Malheureusement, la perte de la m\u00e9moire et des capacit\u00e9s cognitives n&rsquo;est pas le seul sympt\u00f4me de cette terrible maladie. Les personnes atteintes de d\u00e9mence pr\u00e9sentent \u00e9galement des changements de personnalit\u00e9, devenant agressives et col\u00e9riques. Ce comportement a tendance \u00e0 se manifester la nuit, un ph\u00e9nom\u00e8ne connu sous le nom de \u00ab\u00a0sundowning\u00a0\u00bb.<\/p>\n<p>Environ 20 % des personnes atteintes de la maladie d&rsquo;Alzheimer <a href=\"https:\/\/www.nhlbi.nih.gov\/news\/2018\/there-connection-between-circadian-rhythm-and-aggression-study-finds\" target=\"_blank\" rel=\"noopener noreferrer\">souffrent de ce<\/a> syndrome, qui est \u00e9galement fr\u00e9quent dans d&rsquo;autres formes de d\u00e9mence. Dans ce syndrome, les personnes atteintes de d\u00e9mence deviennent plus confuses, anxieuses, d\u00e9sorient\u00e9es et agressives lorsque le soleil se couche. Ce comportement peut \u00eatre dangereux, car les personnes \u00e2g\u00e9es d\u00e9sorient\u00e9es tentent souvent de quitter leur domicile ou se montrent violentes avec leurs proches et les personnes qui s&rsquo;occupent d&rsquo;elles. C&rsquo;est l&rsquo;une des raisons les plus fr\u00e9quentes pour lesquelles une personne atteinte de d\u00e9mence est plac\u00e9e dans un foyer ou un autre \u00e9tablissement m\u00e9dicalis\u00e9, car elle limite la capacit\u00e9 des proches \u00e0 fournir une surveillance et des soins ad\u00e9quats.<\/p>\n<h2>Le rythme circadien et l&rsquo;agressivit\u00e9<\/h2>\n<p>Notre rythme circadien contr\u00f4le ou influence un grand nombre de nos comportements, nous permettant de savoir quand manger, dormir, nous r\u00e9veiller, etc. Selon de nouvelles recherches, le rythme circadien pourrait \u00e9galement jouer un r\u00f4le important dans notre humeur. Des chercheurs ont \u00e9tudi\u00e9 le comportement agressif de souris, en notant soigneusement les moments o\u00f9 elles \u00e9taient le plus agressives. Ils ont constat\u00e9 que les souris \u00e9taient <a href=\"https:\/\/www.sciencedaily.com\/releases\/2018\/04\/180409185309.htm\" target=\"_blank\" rel=\"noopener noreferrer\">plus susceptibles d&rsquo;\u00eatre agressives le soir<\/a>, apr\u00e8s l&rsquo;extinction des lumi\u00e8res du laboratoire. Leur agressivit\u00e9 augmentait lentement tout au long de la journ\u00e9e et atteignait son paroxysme juste avant l&rsquo;heure du coucher.<\/p>\n<p>Les chercheurs ont not\u00e9 que ce comportement imitait celui du coucher du soleil observ\u00e9 chez les personnes \u00e2g\u00e9es. Toutefois, la manipulation de l&rsquo;\u00e9clairage ne suffira peut-\u00eatre pas \u00e0 r\u00e9soudre ce probl\u00e8me : Lorsque les chercheurs ont modifi\u00e9 le rythme de l&rsquo;\u00e9clairage, ils ont constat\u00e9 que les souris continuaient \u00e0 pr\u00e9senter des variations cycliques de l&rsquo;agressivit\u00e9 similaires \u00e0 celles du coucher du soleil.<\/p>\n<h2>Peut-on \u00e9teindre l&rsquo;agressivit\u00e9 ?<\/h2>\n<p>La question suivante pour les chercheurs \u00e9tait de savoir s&rsquo;ils pouvaient \u00ab\u00a0d\u00e9sactiver\u00a0\u00bb l&rsquo;agressivit\u00e9, en particulier son augmentation \u00e0 certaines heures de la journ\u00e9e. Ils ont pu d\u00e9sactiver diff\u00e9rents neurones dans le cerveau des souris et observer les changements de comportement. Lorsqu&rsquo;ils ont d\u00e9sactiv\u00e9 un groupe sp\u00e9cifique de neurones GABAergiques dans le <a href=\"https:\/\/www.chronobiology.com\/unraveling-mysteries-biological-rhythms-suprachiasmatic-nucleus\/\" target=\"_blank\" rel=\"noopener noreferrer\">noyau suprachiasmatique<\/a>, ou horloge ma\u00eetresse du cerveau, les souris ont perdu la rythmicit\u00e9 de leur agression. Ces souris sont devenues <a href=\"https:\/\/www.sciencedaily.com\/releases\/2018\/04\/180409185309.htm\" target=\"_blank\" rel=\"noopener noreferrer\">plus agressives dans l&rsquo;ensemble<\/a>, mais elles n&rsquo;\u00e9taient plus rythm\u00e9es par l&rsquo;horloge. Bien qu&rsquo;elles fassent toujours preuve d&rsquo;agressivit\u00e9, l&rsquo;augmentation marqu\u00e9e le soir a disparu.<\/p>\n<p>Le r\u00f4le de ce groupe particulier de neurones semble \u00eatre <a href=\"https:\/\/www.sciencedaily.com\/releases\/2018\/05\/180502104100.htm\" target=\"_blank\" rel=\"noopener noreferrer\">particuli\u00e8rement important dans le lien entre le rythme circadien et l&rsquo;agressivit\u00e9<\/a>. Ces neurones ont des fibres qui se connectent directement \u00e0 une zone adjacente du cerveau appel\u00e9e hypothalamus ventrom\u00e9dian, qui est la r\u00e9gion qui contr\u00f4le l&rsquo;agressivit\u00e9. Les chercheurs pensent que cette voie peut d\u00e9sactiver <a href=\"http:\/\/ccb.ucsd.edu\/activities-and-events\/clocks-in-the-news.html#aggression\" target=\"_blank\" rel=\"noopener noreferrer\">l&rsquo;agressivit\u00e9<\/a> le matin et tout au long de la journ\u00e9e, en fonction de nos horloges internes, ce qui expliquerait pourquoi l&rsquo;agressivit\u00e9 augmente lorsque ce groupe de neurones est d\u00e9sactiv\u00e9.<\/p>\n<h2>Liens entre le sommeil et la d\u00e9mence<a href=\"https:\/\/www.chronobiology.com\/wp-content\/uploads\/2018\/11\/discovered-new-link-between-circadian-rhythm-and-aggression-2.jpg\"><img decoding=\"async\" class=\"size-medium wp-image-27578 alignright\" title=\"Discovered: New Link Between Circadian Rhythm and Aggression 1\" src=\"https:\/\/www.chronobiology.com\/wp-content\/uploads\/2018\/11\/discovered-new-link-between-circadian-rhythm-and-aggression-2-300x206.jpg\" alt=\"Discovered: New Link Between Circadian Rhythm and Aggression 1\" width=\"300\" height=\"206\" srcset=\"https:\/\/dev.chronobiology.com\/wp-content\/uploads\/2018\/11\/discovered-new-link-between-circadian-rhythm-and-aggression-2-300x206.jpg 300w, https:\/\/dev.chronobiology.com\/wp-content\/uploads\/2018\/11\/discovered-new-link-between-circadian-rhythm-and-aggression-2-768x528.jpg 768w, https:\/\/dev.chronobiology.com\/wp-content\/uploads\/2018\/11\/discovered-new-link-between-circadian-rhythm-and-aggression-2.jpg 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/h2>\n<p>Ce n&rsquo;est pas la premi\u00e8re \u00e9tude \u00e0 \u00e9tablir un lien entre le <a href=\"https:\/\/www.chronobiology.com\/circadian-rhythm-alzheimers-linked-little-known-brain-nutrient\/\" target=\"_blank\" rel=\"noopener noreferrer\">sommeil et la d\u00e9mence<\/a>. Les personnes \u00e2g\u00e9es ont tendance \u00e0 perdre une grande partie de leur rythmicit\u00e9 avec l&rsquo;\u00e2ge, en particulier celles qui souffrent de d\u00e9mence. En raison de la <a href=\"https:\/\/www.chronobiology.com\/newly-discovered-genes-cause-circadian-rhythms-to-change-as-we-age\/\" target=\"_blank\" rel=\"noopener noreferrer\">baisse des niveaux de m\u00e9latonine et d&rsquo;autres modifications du rythme circadien<\/a>, leurs cycles veille-sommeil et leurs habitudes quotidiennes changent. Les personnes \u00e2g\u00e9es sont plus susceptibles de dormir moins longtemps la nuit et de faire des siestes pendant la journ\u00e9e.<\/p>\n<p>Cette perte du rythme circadien a \u00e9t\u00e9 associ\u00e9e \u00e0 l&rsquo;aggravation de plusieurs maladies associ\u00e9es au vieillissement, de la maladie d&rsquo;Alzheimer aux maladies cardiovasculaires. Les chercheurs ne savent pas exactement comment arr\u00eater ce d\u00e9clin, car le <a href=\"https:\/\/www.sciencealert.com\/a-new-circadian-clock-takes-over-when-we-get-older-study-finds\" target=\"_blank\" rel=\"noopener noreferrer\">changement du rythme circadien semble \u00eatre g\u00e9n\u00e9tiquement programm\u00e9<\/a> en nous.<\/p>\n<p>Bien que cette \u00e9tude n&rsquo;apporte pas de r\u00e9ponse facile au probl\u00e8me du coucher du soleil et \u00e0 d&rsquo;autres aspects moins agr\u00e9ables de la d\u00e9mence, elle offre n\u00e9anmoins un nouvel \u00e9clairage sur un probl\u00e8me courant du vieillissement. Un jour, nous pourrons peut-\u00eatre traiter ce syndrome et r\u00e9duire la douleur qu&rsquo;il cause \u00e0 la fois aux personnes qui en souffrent et \u00e0 celles qui s&rsquo;en occupent. Nos a\u00een\u00e9s, en particulier ceux qui souffrent de d\u00e9mence, m\u00e9ritent ce qu&rsquo;il y a de mieux en mati\u00e8re de technologie m\u00e9dicale et de perc\u00e9es scientifiques.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La d\u00e9mence est l&rsquo;une des maladies les plus r\u00e9pandues dans le monde, une personne sur trois en souffrant sous une forme ou une autre avant de mourir. Outre la perte des capacit\u00e9s cognitives et de la m\u00e9moire, les personnes atteintes de d\u00e9mence souffrent souvent de sautes d&rsquo;humeur et de changements de comportement. L&rsquo;un des changements [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":27574,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[174,259,255],"tags":[],"class_list":{"0":"post-58751","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-le-rythme-circadien","8":"category-sante-mentale","9":"category-sommeil","10":"entry"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.4 (Yoast SEO v23.4) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>D\u00e9couverte : Nouveau lien entre le rythme circadien et l&#039;agressivit\u00e9 &#8211; 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