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J Appl Physiol 82: 772-775, 1997;
8750-7587/97 $5.00
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Journal of Applied Physiology
Vol. 82, No. 3, pp. 772-775, March 1997
METABOLISM

Enlargement of glycogen store in rat liver and muscle by fructose-diet intake and exercise training

Taro Murakami1, Yoshiharu Shimomura1, Noriaki Fujitsuka1, Masahiro Sokabe2, Koji Okamura3, and Shuichi Sakamoto3

1 Department of Bioscience, Nagoya Institute of Technology, Gokiso, and 2 Department of Physiology, Nagoya University School of Medicine, Showa-Ku, Nagoya 466; and 3 Otsuka Pharmaceutical Co., Ltd., Kanzaki-Gun, Saga 842-01, Japan

Received 25 September 1995; accepted in final form 25 November 1996.

Murakami, Taro, Yoshiharu Shimomura, Noriaki Fujitsuka, Masahiro Sokabe, Koji Okamura, and Shuichi Sakamoto. Enlargement of glycogen store in rat liver and muscle by fructose-diet intake and exercise training. J. Appl. Physiol. 82(3): 772-775, 1997.---This study investigated the effect of long-term intake of a fructose diet and exercise training on glycogen content in liver and skeletal muscle in female rats. Thirty-six rats (8 wk old) were divided into two dietary groups and were fed with a control (chow) diet or fructose diet (containing 20% fructose) for 12 wk. During this period, one-half of the rats in each dietary group were trained by using a motor-driven treadmill (running speed of 25 m/min and duration of 90 min/day, 5 days/wk). The liver glycogen was increased by intake of a fructose diet and exercise training, and the content was in the following order: control-diet and sedentary rats < fructose-diet and sedentary rats <=  control-diet and trained rats < fructose-diet and trained rats in the ratio of 1:3.4:3.6:5.0. The glycogen content in gastrocnemius muscle showed the same trend as that in liver; the ratio was 1:1.3:1.3:1.6. These results indicate that both long-term intake of the fructose diet and exercise training synergistically increased glycogen in both tissues.

cytochrome oxidase; serum triglyceride; run training

0161-7567/97 $5.00 Copyright © 1997 the American Physiological Society




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