The Science & Health Benefits of Deliberate Heat Exposure | Episode 69 - Deepstash
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Key Takeaways From The Podcast

Key Takeaways From The Podcast

  • Regular use of sauna and other heat exposure can reduce mortality by cardiovascular events, stroke, and all-cause mortality.
  • Effects of deliberate heat mimic cardiovascular exercise.
  • Make sure you’re replacing the water you lose in the sauna – drink at least 16 ounces of water for every 10 minutes of sauna use.
  • Proper application of local heat may actually change the identity of fat cells at that location and encourage the conversion of white fat to beige fat.

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Heating Up Of Bodies

Heating Up Of Bodies

  • Our body can heat up from outside in or inside out
  • We have two body temperatures: (1) skin/shell; (2) core (organs, viscera, spinal cord)
  • The brain is constantly sending signals to the body’s heating and cooling system based on the environment
  • If you throw a cold towel on your body, your brain will actually think you need to heat up your core
  • In a hot environment, the brain tries to cool down your core
  • The transition between hot and cold temperatures engages the process of heating and reheating

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The Heating Up Mechanism

The Heating Up Mechanism

(1) Skin has neurons that sense changes in heat;

(2) Electrical signals are sent to the spinal cord;

(3) Signals are sent to the brain – specifically the preoptic area (POA) which send signals to the brain & body and trigger behavioral responses.

The impulse to get yourself out of a hot environment is the consequence of the POA communicating with the amygdala and in turn activating adrenal glands

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Deliberate Heat Exposure Changes Biology

Deliberate Heat Exposure Changes Biology

  • Regular use of sauna and other heat exposure can reduce mortality by cardiovascular events, stroke, and all-cause mortality.
  • You will become better adapted and better at sweating excess heat with frequent exposure.
  • Options if you don’t have access to a sauna: try hot water bath up to the neck – getting a similar temperature is key (176F-212F); wear a plastic suit (like fighters trying to drop weight).
  • Wet sauna and dry sauna are both acceptable; most infrared saunas don’t get hot enough.

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The Many Uses Of Body Heating

The Many Uses Of Body Heating

Hormone effects of heat: decrease in cortisol output.

Activation of heat shock proteins (HSP): heat changes the way in which proteins are configured at a molecular level – HSP makes sure cells of the brain and body don’t misfold

Heat for lifespan: heat upregulates pathways related to DNA repair and clearing out of senescent cells.

Heat for metabolic enhancement:  57 minutes per week (total, spread out across sessions) of heat exposure – cold exposure: 11 minutes per spread out of the uncomfortable but safe cold.

Hormesis: subjecting yourself to enough stress to induce adaptation of some kind.

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Increase Of Growth Hormone

Increase Of Growth Hormone

  • Growth hormone: impacts metabolism and growth of cells and tissues of the body, responsible for tissue repair and growth spurt during puberty.
  • Starting in the early 30s, growth hormone release is greatly diminished.
  • Sauna exposure increased growth hormone 16 fold – important caveat, effect on growth hormone went down with increased sauna use because body becomes heat adapted.
  • If growth hormone increase is your main goal for sauna use, limit to 1x/week or 1x/10 days – and enter fasted or without food in the 2-3 hours prior for maximum benefits.

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Improved Mood

Improved Mood

The endorphin system is activated when we experience short stress.

Dynorphin system: the struggle of heat exposure ultimately activates pathways that lead to an increase in the baseline level of mood and heightened level of happiness and improved mood.

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Adjusting Body Heat With Glabrous Skin Surfaces

Adjusting Body Heat With Glabrous Skin Surfaces

Glabrous skin: hair-free skin found in palms of hands, soles of feet, the upper half of the face.

Glabrous skin surfaces can be leveraged to cool the blood and core of the body.

To warm a cold body: use a warm blanket or warmer on glabrous surfaces.

To cool a hot body: use a cool compress, frozen or cold materials on glabrous surfaces.

Fever is natural heat inoculation designed to kill pathogens in the body.

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Types Of Fat & Responses To Temperature

Types Of Fat & Responses To Temperature

Cold exposure (11 minutes per week, up to the neck) has been shown to increase brown fat which increases metabolism and the ability to feel comfortable in cold temperatures.

Local heat exposure (not to the point of burning) converts white fat to beige fat which leads to systemic increases in thermogenesis, metabolism, and fat loss – children have a lot of brown and beige fat.

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CURATED BY

autumn_mm

Reading is my passion, leadership is my favourite non-fiction. A bit of a geek.

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