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Medicine & Science in Sports & Exercise:
D16n Free Communication/Poster Nutrition and Sport

EFFECT OF DIFFERENT TYPE OF HIGH FAT DIETS OF ENZYME ACTIVITIES IN RAT SKELETAL MUSCLE

Nakatani, A1; Okazaki, M1; Hirano, N2; Sakata, S3

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1Nara University of Education, Nara Japan

2Kobe Womenüfs Junior College, Kobe Japan

3Nara Medical University, Kashihara Japan

e-mail: akira@nara-edu.ac.jp (Sponsor: Mitsuru Higuchi, FACSM)

The purpose of this study was to determine the effect of different fat type of high fat diets on enzyme activities in rat skeletal muscle. Fifty-six male Wistar rats were fed one of four diets: low fat (12% calories as fat), lard (60% calories as fat), safflower oil (60% calories as fat) or fish oil (60% calories as fat). They ate their diets ad libitum for 5 weeks. Each group was further divided into sedentary and exercise trained groups. There were no significant differences in body weight among each diet group. Epidydimal adipose tissue weight was higher in lard and safflower oil groups than in low fat. Endurance training decreased body weight and adipose tissue weight in each diet group. Plasma leptin were also significantly higher in lard and safflower oil groups than in low fat group. Safflower and fish oil diet induced significant (P < 0.05) increases in citrate synthase (∼30% and ∼35%, respectively) and 3 hydroxyacyl CoA dehydrogenase activities (∼58%) in red portion of gastrocnemius muscle, but not in lactate dehydrogenase. There was an additive effect of endurance training and high fat diets on CS and 3-HAD activities in each group. These results show that high fat diet consisted of fish oil increases oxidative capacity in skeletal muscle without getting body fat and that this might increase an endurance capacity.

©2001The American College of Sports Medicine

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