Le tissu adipeux brun, la thermogénèse, et les bains froids


Figure 4 de Mapping of human brown adipose tissue in lean and obese young men

https://www.pnas.org/content/114/32/8649

BAT = Brown Adipose Tissue 

 


Avec l'hiver à nos portes, je partage ci-dessous mon intérêt pour le tissu adipeux brun.

Le tissu adipeux blanc a un rôle d'isolant et de stockage.
Le tissu adipeux brun ("gras brun") diffère du traditionnel tissue adipeux blanc.
Le tissus adipeux brun a un rôle de plinthe électrique (thermogénèse).
Et non, manger de la galvaude ne donne pas plus de gras brun.😄

Selon le livre Human Anatomy & Physiology de Élaine Marieb, 5ème édition, publié en 2001, le tissu adipeux brun est présent seulement chez les bébés, qui ne peuvent pas frissonner.

Le tissu adipeux brun fonctionnel a été découvert chez les adultes en 2009 (New England Journal of Medicine).

Le tissu adipeux brun a été cartographié chez l'humain adulte en 2017 (Proceedings of the National Academy of Sciences).
J'ai mis la Figure 4 de l'article de 2017 en attaché.

En 2010, l'homme de glace ("The Ice Man") Wim Hof a fait un TEDx Talk sur l'exposition au froid.

Wim Hof est resté 1 h dans un bac de glace (4 °C) en costume de bain.
Ce gars là a monté l'Himalaya en bedaine et culottes courtes.

Mon record personnel visant le développement de mon "gras brun" est un bain froid de 10 minutes à 13.5 °C avec les pieds, mains, et tête en dehors de l'eau.

Références

Virtanen, K.A., Lidell, M.E., Orava, J., Heglind, M., Westergren, R., Niemi, T., Taittonen, M., Laine, J., Savisto, N.J., Enerbäck, S. and Nuutila, P., 2009. Functional brown adipose tissue in healthy adults. New England Journal of Medicine, 360(15), pp.1518-1525. https://www.nejm.org/doi/full/10.1056/NEJMoa0808949

Leitner, B.P., Huang, S., Brychta, R.J., Duckworth, C.J., Baskin, A.S., McGehee, S., Tal, I., Dieckmann, W., Gupta, G., Kolodny, G.M. and Pacak, K., 2017. Mapping of human brown adipose tissue in lean and obese young men. Proceedings of the national academy of sciences, 114(32), pp.8649-8654. https://www.pnas.org/content/114/32/8649


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