Brown adipose tissue thermogenesis among a small sample of reindeer herd from sub-Arctic Finland

Cara Ocobock, Päivi Soppela, Minna Turunen, Ville Stenbäck, Karl-Heinz Herzig

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Abstract

Introduction
Interest in human physiological responses to cold stress have seen a resurgence in recent years with a focus on brown adipose tissue (BAT), a mitochondria dense fat specialized for heat production. However, a majority of the work examining BAT has been conducted among temperate climate populations.
Methods
To expand our understanding of BAT thermogenesis in a cold climate population, we measured, using indirect calorimetry and thermal imaging, metabolic rate and body surface temperatures of BAT-positive and BAT-negative regions at room temperature, and mild cold exposure of resting participants from a small sample of reindeer herders (N = 22, 6 females) from sub-Arctic Finland.
Results
We found that most herders experienced a significant mean 8.7% increase in metabolic rates, preferentially metabolized fatty acids, and maintained relatively warmer body surface temperatures at the supraclavicular region (known BAT location) compared to the sternum, which has no associated BAT. These results indicate that the herders in this sample exhibit active BAT thermogenesis in response to mild cold exposure.
Conclusions
This study adds to the rapidly growing body of work looking at the physiological and thermoregulatory significance of BAT and the important role it may play among cold stressed populations.
Original languageEnglish
Number of pages12
JournalJournal of Physiological Anthropology
Volume41
Issue number17
DOIs
Publication statusPublished - 20 Apr 2022
MoEC publication typeA1 Journal article-refereed

Keywords

  • brown adipose tissue
  • cold stress
  • non‑shivering thermogenesis
  • metabolism
  • respiratory quotient

Field of science

  • Ecology, evolutionary biology
  • Plant biology, microbiology, virology

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