ANDREW HUBERMAN 2 | In the SAUNA: Our BRAIN SIGNALS SWEAT or Flight

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2 years ago
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http://www.DoctorsToTrust.com
presents episode 648 | Dr Andrew Huberman
HubermanLab podcast

Neurons exist in the brain, skin, body that
communicate together allowing you to heat
up or cool down when needed
-shell [skin] has nerve cells
~these have receptors that sense
changes in heat
-send signals into spinal cord
-top of spinal cord has neurons [Dorsal Horn]
~signals relay station in brain
-signals POA [pre-optic area]:
neurons over roof of mouth [in the hypothalamus]
They signal body & brain to change heat
AND CHANGE BEHAVIOR

POA will change the way you think & feel...
Immediately:
Example
If heat touches skin
-POA signals endothelial cells to dilate:
in order to cast off heat
-will start sweating due to POA signals and
acetylcholine
-if shivering: POA signals you to stop
-if over heating: POA signals muscles to spread out
to release heat

POA acts at autonomic level...
-can't make yourself sweat
-vasodilation [dilation of veins & capillaries]
Also voluntary actions prompted by POA
Also: lethargy, tiredness feeling on hot day
When warm enough, we are active
When too warm, we want to slow down,
spread limbs to dump heat

POA can also signal the amygdala...
[brain area that can activate
sympathetic nervous system]
-fight or flight
~stress response
~excited response
POA signals amygdala when you are suddenly in heat that
feels too hot and risky
Example: 210 degree sauna, first minute in:
-heart rate increases
-may feel impulse to get out
Amygdala activates adrenal glands: makes you agitated

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@hubermanlab

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