Improvements in insulin sensitivity are blunted by subclinical hypothyroidism.

Details

Ressource 1Download: Serval_PostPrint_2009_Improvements in insulin sensitivity are blunted by subclinical hypothyroidism.pdf (375.76 [Ko])
State: Public
Version: Author's accepted manuscript
Serval ID
serval:BIB_6CBC385F2349
Type
Article: article from journal or magazin.
Collection
Publications
Title
Improvements in insulin sensitivity are blunted by subclinical hypothyroidism.
Journal
Medicine and Science in Sports and Exercise
Author(s)
Amati F., Dubé J.J., Stefanovic-Racic M., Toledo F.G., Goodpaster B.H.
ISSN
1530-0315 (Electronic)
ISSN-L
0195-9131
Publication state
Published
Issued date
2009
Volume
41
Number
2
Pages
265-269
Language
english
Notes
Publication types: Clinical Trial ; Journal Article
Abstract
PURPOSE: Exercise- and weight loss-induced improvements in insulin resistance (IR) are variable; some individuals experience robust enhancements in insulin sensitivity, whereas others do not. Thyroid hormone status is related to IR, but it is not clear whether subclinical hypothyroidism may help to explain the variability in improvements in IR with diet and exercise. The purpose of this study was to examine whether thyroid hormone status is related to the improvement in insulin sensitivity and physical fitness after weight loss and exercise training.
METHODS: By retrospective nested case-control analysis, eight subclinical hypothyroid (sHT) subjects and eight matched euthyroid controls underwent a euglycemic hyperinsulinemic clamp and peak oxygen uptake test, before and after a 16-wk program of moderate aerobic exercise combined with diet-induced weight loss. All subjects were middle-aged (57.3 +/- 3.3 yr), were overweight to obese (body mass index = 33.1 +/- 0.8 kg m(-2)), and had impaired glucose tolerance.
RESULTS: The improvement in insulin sensitivity was significantly lower (P < 0.05) in the sHT group than in the euthyroid group. Both groups performed similar amounts of regular exercise and lost a significant amount of body weight during the intervention. VO(2peak) tended to improve in the euthyroid group but not in the sHT group.
CONCLUSION: Subclinical hypothyroidism may interfere with beneficial adaptations on muscle metabolism and physical fitness that typically occur with weight loss and increased physical activity. These results may have significant clinical implications because of the high prevalence of both hypothyroidism and insulin resistance in the aging population.
Keywords
Case-Control Studies, Exercise, Exercise Therapy, Female, Humans, Hypothyroidism/complications, Hypothyroidism/physiopathology, Insulin Resistance/physiology, Male, Middle Aged, Motor Activity, Obesity/complications, Obesity/physiopathology, Treatment Outcome, Weight Loss
Pubmed
Web of science
Create date
24/03/2011 9:35
Last modification date
20/08/2019 14:26
Usage data