cold thermogenesis and thyroid

[jyb]

http://www.jappl.org/content/95/4/1584.full

A novel aspect of this study was to conduct the thyroid ablation after cold acclimation had been achieved, resulting in a hypothyroid state associated with normal body temperature and survival. This approach allowed us to assess the effects of cold-induced NST in tissues free of thyroid-induced thermogenesis. In contrast, room temperature-adapted hypothyroid rats are unsuitable for these studies, because the animals rapidly develop hypothermia and die within hours of cold exposure.

 

[chris]

"If a person is in very good health, cold stimulation can increase thyroid and other anabolic hormones, but it can be too stressful if a person's energy level is already low." RP

 

[Mauritio]

"In rats, exposed to cooling at 2 degrees within 2 hrs, total gas exchange and the respiratory activity of sceletal muscles mitochondria were studied. The adapted rats, which were kept at 5-7 degrees within 13-17 days, were compared with unadapted animals (kept at 18 degrees). In the group of adapted rats cooling caused the increase in the total O2 utilization by 105% with increased free oxidation in mitochondria and the distinct decrease in P/O ratio. Cooling of unadapted rats was accompanied by the increase in O2 utilization by 85% without any marked alteration in P/O ratio in sceletal muscles mitochondria. The body temperature was not altered."

[Effect of adaptation to cold and moderate cooling on respiration and oxidative phosphorylation in the muscle mitochondria of albino rats] - PubMed

In rats, exposed to cooling at 2 degrees within 2 hrs, total gas exchange and the respiratory activity of sceletal muscles mitochondria were studied. The adapted rats, which were kept at 5-7 degrees within 13-17 days, were compared with unadapted animals (kept at 18 degrees). In the group of...

pubmed.ncbi.nlm.nih.gov