Shivering and nonshivering thermogenesis in exercised cold-deacclimated rats

@article{Moriya2004ShiveringAN,
  title={Shivering and nonshivering thermogenesis in exercised cold-deacclimated rats},
  author={Kiyoshi Moriya and J Arnold and Jacques Leblanc},
  journal={European Journal of Applied Physiology and Occupational Physiology},
  year={2004},
  volume={57},
  pages={467-473}
}
SummaryNorepinephrine (NE)-induced increase in oxygen consumption ( $$\dot V_{{\text{O}}_{\text{2}} } $$ ) and colonic temperature (Tc) was greater in cold-acclimated rats housed at 4° C for 4 weeks (CA) than warm-acclimated controls housed at 24° C for 4 weeks (WA). On the other hand, shivering activity measured at 4° C was less in CA than in WA, while propranolol administration eliminated the difference between these two groups by enhancing shivering in CA. Wet weight and protein content of… 
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Circadian rhythmicity of body temperature and metabolism
TLDR
The circadian system modulates metabolic heat production to generate the body temperature rhythm, which challenges homeothermy but does not abolish it, meaning that circadian rhythmicity and metabolism are intertwined in the cell.

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