{"id":32894,"date":"2021-08-26T15:10:08","date_gmt":"2021-08-26T13:10:08","guid":{"rendered":"https:\/\/www.staging12.lazeo.com\/traitements\/epilation-definitive-au-laser\/cycle-pilaire\/"},"modified":"2021-12-15T11:31:39","modified_gmt":"2021-12-15T10:31:39","slug":"cycle-pilaire","status":"publish","type":"traitements","link":"https:\/\/heuristic-chaum.217-154-146-230.plesk.page\/be-fr\/traitements\/epilation-definitive-au-laser\/cycle-pilaire\/","title":{"rendered":"Cycle pilaire"},"content":{"rendered":"\n
\n

Le cycle pilaire a un r\u00f4le d\u00e9terminant dans l\u2019efficacit\u00e9 du traitement. En effet, c\u2019est pendant la p\u00e9riode de croissance du poil que le laser est le plus efficace car c\u2019est \u00e0 ce moment pr\u00e9cis que la racine du poil est fortement concentr\u00e9e en m\u00e9lanine. Cette m\u00e9lanine est l\u2019\u00e9l\u00e9ment cl\u00e9 du fonctionnement du traitement, puisqu\u2019elle absorbe le laser qui se transforme instantan\u00e9ment en chaleur et d\u00e9sint\u00e8gre le poil.<\/p>\n\n\n\n

Les poils ont tous le m\u00eame cycle de vie, mais ne vivent pas les m\u00eames phases de cycle au m\u00eame moment, contrairement aux animaux qui ont des p\u00e9riodes de mue bien d\u00e9termin\u00e9es. Il est aussi important de noter que certaines zones n\u2019ont pas le m\u00eame cycle de vie en terme de dur\u00e9e : en effet, les poils de la moustache ont une dur\u00e9e de vie d\u2019environ 5 mois, alors que les poils de jambe ont une dur\u00e9e de vie de 18 \u00e0 24 mois environ. L\u2019\u00e2ge et le sexe de l\u2019individu influence \u00e9galement la dur\u00e9e du cycle pilaire. Tout est une question d\u2019hormones.<\/p>\n\n\n\n

Situ\u00e9e \u00e0 1,5 mm de la surface de la peau, c\u2019est dans la matrice o\u00f9 se forme la racine du poil que le cycle pilaire d\u00e9bute.<\/p>\n\n\n\n

  1. La phase anag\u00e8ne :<\/strong>
    c\u2019est la p\u00e9riode de croissance du poil o\u00f9 la concentration en m\u00e9lanine y est la plus \u00e9lev\u00e9e, et durant laquelle l\u2019\u00e9pilation est efficace. La m\u00e9lanine y est particuli\u00e8rement concentr\u00e9e puisque c\u2019est \u00e0 cette p\u00e9riode que la pigmentation du poil se d\u00e9termine. Cette phase concerne environ 25% des poils lors d\u2019une s\u00e9ance d\u2019\u00e9pilation, c\u2019est le pourcentage de poils d\u00e9truits avec succ\u00e8s. Cette phase o\u00f9 la papille dermique nourrit le poil pour le faire pousser dure de 1 \u00e0 3 mois .<\/li>
  2. La phase catag\u00e8ne :<\/strong>
    c\u2019est la p\u00e9riode de repos cellulaire du poil qui arr\u00eate tout processus de croissance. Cette phase assez courte dure environ 3 semaines. C\u2019est \u00e0 ce moment l\u00e0 que le poil se d\u00e9tache de sa source nourrici\u00e8re pour arr\u00eater son d\u00e9veloppement. Ainsi la m\u00e9lanine est peu concentr\u00e9e dans la racine, ce qui explique la quasi inefficacit\u00e9 du laser \u00e0 cette phase.<\/li>
  3. La phase t\u00e9log\u00e8ne :<\/strong>
    c\u2019est la p\u00e9riode de fin de vie du poil qui laisse place \u00e0 la pousse d\u2019un nouveau poil. Le laser n\u2019est pas du tout efficace \u00e0 cette p\u00e9riode qui dure entre 3 et 4 mois environ car la m\u00e9lanine y est inexistante. Le nouveau poil en phase anag\u00e8ne pousse petit \u00e0 petit le poil en phase t\u00e9log\u00e8ne puis finit par le faire tomber.<\/li><\/ol>\n\n\n\n
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