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METABOLIC AND THYROIDAL RESPONSES TO MILD COLD ARE ABNORMAL IN OBESE DIABETIC WOMEN
Author(s) -
LEAN M. E. J.,
MURGATROYD P. R.,
ROTHNIE I.,
REID I. W.,
HARVEY R.
Publication year - 1988
Publication title -
clinical endocrinology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.055
H-Index - 147
eISSN - 1365-2265
pISSN - 0300-0664
DOI - 10.1111/j.1365-2265.1988.tb03859.x
Subject(s) - medicine , endocrinology , euthyroid , basal metabolic rate , thermogenesis , basal (medicine) , obesity , thyroid , diabetes mellitus , hormone
SUMMARY Mild cold exposure (22°C, with reference to 28°C, thermoneutral) was studied by overnight whole‐body indirect calorimetry in euthyroid women. Basal, sleeping, energy expenditure (EE) was significantly increased (+ 3.8%, P < 0.05) in six normal weight women but reduced (−3.5%, P < 0.05) in five obese type II diabetic women. Mixed responses were found in five women with simple obesity. Biochemical measurements were made on fasting blood samples taken at 0900 h after 12 h exposure to the two temperatures. Serum T4, free T3 and TSH were within the normal reference range in all subjects. Serum T4 did not show any differences between the groups, nor any effect from temperature. There was a significant increase in free T3 ( P < 0.05) at 22°C in the control subjects, but no differences in the obese diabetic women. Serum thyroglobulin fell significantly in the diabetic group. Both TSH and free T3 responses to mild cold were significantly different between the groups, but both correlated positively ( P <0.05) with the changes in sleeping energy expenditure at 22°C with reference to 28°C. Changes in TSH and free T3 were themselves significantly correlated within individuals ( P <0.01). The normal physiological non‐shivering thermogenesis of adult humans on exposure to a cool environment may thus be mediated by a pituitary‐thyroid mechanism. The abnormal response of obese diabetic women was associated with impaired TSH and thyroid hormone responses, and may be a factor contributing to weight gain.