this post was submitted on 17 Jan 2025
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Cold_irl (Art by GlassShine) (medias.meow.social)
submitted 1 month ago by ThefuzzyFurryComrade@pawb.social to c/furry_irl@pawb.social
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Source (Mastadon)

As a Canadian, I relate to the one in shorts.

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[–] OmegaMouse@pawb.social 2 points 1 month ago (1 children)

Hehe you're probably right though! I don't have much in the way of fat reserves :'3

[–] ThefuzzyFurryComrade@pawb.social 2 points 1 month ago (1 children)

Brown fat is different from white fat as while white fat is good for insulation, brown fat actually produces a massive amount of heat.

[–] OmegaMouse@pawb.social 2 points 1 month ago (1 children)

How I do get more? :o

[–] ThefuzzyFurryComrade@pawb.social 2 points 1 month ago (1 children)

When unacclimatized animals are placed in a cold environment, they will acutely defend their body temperature by means of shivering thermogenesis (muscle contractions), which increases heat production (energy expenditure). However, upon prolonged cold exposure, shivering will gradually decrease, but energy expenditure remains elevated, indicating increased NST

Interestingly, an older study in humans already showed that prolonged cold exposure (12°C, 8 h/d, 31 days) in healthy men also resulted in a gradual decrease of shivering, while heat production remained elevated (11).

Before cold acclimation, 94% (16 out of 17) of the subjects showed cold-activated BAT depots, and after cold acclimation, 100% BAT prevalence was observed. Cold acclimation increased upper body BAT activity from 2.4 ± 0.7 to 2.8 ± 0.5 SUV mean (P < 0.01) and detectable BAT volume expanded from 665 ± 451 cc before to 913 ± 458 cc (P < 0.01) afterwards. Analysis of dynamic PET/CT imaging of the supraclavicular region revealed that upon cold acclimation, glucose uptake rate did not increase significantly (6.9 ± 3.0 vs. 7.6 ± 2.5 μmol/min/100 g; P > 0.05).

Or in normal people speak: People who were exposed to the cold got more brown fat.

Study

[–] OmegaMouse@pawb.social 2 points 1 month ago

Oh damn, so those people who are able to go around in shorts have just had more exposure to cold in the past I guess!