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Horm Metab Res 2001; 33(6): 365-369
DOI: 10.1055/s-2001-15412
Original Clinical

© Georg Thieme Verlag Stuttgart · New York

Effects of Troglitazone and Voluntary Running on Insulin Resistance Induced High Fat Diet in the Rat

K. Kitakoshi 1 , Y. Oshida 2 , N. Nakai 2 , Y.-Q. Han 1 , Y. Sato 2
  • 1 Department of Sports Medicine, Graduate School of Medicine, Nagoya University
  • 2 Research Center of Health, Physical Fitness and Sports, Nagoya University, Nagoya, Japan
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Publication History

Publication Date:
31 December 2001 (online)

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It is well known that troglitazone and voluntary running have the capacity to improve insulin resistance. The purpose of this study was to evaluate the combination effect of troglitazone and voluntary running on insulin action. Female rats aged 7 weeks were divided into high-fat diet (HF), high-fat diet + troglitazone (0.3 % in diet; Tg), high-fat diet + voluntary running (for 3 wks; Tr), high-fat diet + troglitazone + voluntary running (Tg-Tr), and control (C) groups. A sequential euglycemic clamp experiment with two different insulin infusion rates of 3.0 (L-clamp) and 30.0 mU/kg BW/min (H-clamp) was performed on these rats after an overnight fast. Blood glucose concentrations were kept at fasting levels by periodic adjustment of the intravenous glucose infusion rate during the clamp experiment. Glucose infusion rates (GIRs) calculated from 60 to 90, 150 to 180 min were regarded as an index of whole body insulin action. After the clamp experiment, we determined the amount of glycogen content in the gastrocnemius muscle. Fat feeding markedly reduced GIRs in both L- and H- clamp experiments compared with C. Troglitazone treatment did not improve high-fat induced insulin resistance. In both L- and H-clamp experiments, GIRs were increased by voluntary running compared with HF, and reached the same levels as in C. GIRs of Tg-Tr were not greater than those of Tr. Glycogen content in gastrocnemius muscle showed the same trend as the results for GIRs. Therefore, the combination effect of troglitazone and voluntary running on insulin action was not found, but the effect of voluntary running was shown in fat-induced insulin resistance.

Key words:

Thiazolidinediones - Euglycemic Clamp - Glycogen

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Y. Sato

Research Center of Health, Physical Fitness and Sports
Nagoya University, Furo-cho

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Japan


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