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0.05). Compared with the altitude of 1 507 m group, the activity of SOD and GSH-Px significantly decreased in the altitude of 3 850 m and 2 500 m groups, it was contrary in the content of MDA (P
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AIM: To investigate the effect of cold exposure on the thermoregulatory function in hypothyroid rats. METHODS: Hypothyroid model was established by administration of antithyroid drug propylthiouracil(PTU) in rats. Colonic temperature was measured using digital thermometer. Plasma T_3 and T_4 concentrations were determined by radioimmunoassay. The effect of cold exposure on body temperature was observed after 2 weeks of PTU treatment. RESULTS: Plasma T_3 and T_4 concentrations were reduced markedly 2 weeks after PTU treatment, and colonic temperature was also decreased markedly; Hyperthermic response was not different between PTU group and control group during cold exposure. CONCLUSION: This study suggests that PTU-induced hypothyroid rat possesses a robust thermogenic response to short bouts of cold exposure.