High Fat Diet or Exercise Training Alters Hepatic Total and Phospholipid fatty Acid Compositions in Rats

고지방식이 및 운동훈련이 흰쥐 간조직의 총지방산 및 인지질 지방산패턴에 미치는 영향

  • Jung, Chung-Eun (General Educaton, Kangnam University) ;
  • Um, Young-Sook (Research Institute of Food & Nutritional Sciences, Yonsei University) ;
  • Cha, Youn-Soo (Department of Food and Nutrition, Chonbuk National University) ;
  • Park, Tae-Sun (Department of Food and Nutrition, Yonsei University)
  • 정은정 (강남대학교 교양학부) ;
  • 엄영숙 (연세대학교 식품영양과학연구소) ;
  • 차연수 (전북대학교 식품영양학과) ;
  • 박태선 (연세대학교 식품영양학과)
  • Published : 2000.01.01

Abstract

Effects of high fat diet and/or endurance exercise training on hepatic total and phospholipid(PL) fatty acid compositions were evaluated in rats fed one of the following diets for 31 days. control diet(CD, 5 wt% corn oil) or high fat diet(HFD, 35 wt% corn oil). Half of the rats in each group were exercise-trained regularly on a treadmill for 90 minutes/day during the entire feeding period. Total and PL fatty acid compositions of hepatic lipid extracts were determined by a gas-liquid chromatograph),. Endurance exercise training did not change the daily food intake, but significantly reduced body weight gain and feed efficiency ratio of rats, which were most prominent in animals fed HFD. Exercise training did not significantly change the percentages of ∑saturated fatty acids (SFA) and ∑polyunsaturated fatty acids(PUEA), but decreased the percentage of ∑monounsaturated fatty acids(MUFA) in hepatic total fatty acids, which might be associated with the decrease in (equation omitted) 9-desaturation index of hepatic total fatty acid metabolism. Exercise training significantly lowered the percentages of 16 : 0 and 22 : 5$\omega$3, and increased the percentages of 20 : 1 and 20 : 3$\omega$3 in both total and PL fatty acid compositions in rat liver. Both total fatty acid and PL fatty acid compositions of rat liver responded more sensitively to changes in dietary fat content than to endurance exercise training in this study. Feeding HFD, whoch contains high level of linoleic acid(LA, 18 : 2$\omega$6), significantly decreased the percentages of ∑SFA and $\Sigma$MUFA, and increased the percentages of ∑PUFA and ∑$\omega$6 fatty acids of hepatic total fatty acids. Hepatic total fatty acid composition was affected by dietary fat content and dietary fatty acid composition more sensitively than those found in hepatic PL fatty acid composition. HFD significantly decreased most of desaturation indices, while exercise training significantly decreased elongation index(20 : 5$\omega$3⇒22 : 5$\omega$3) of hepatic total and PL fatty acid metabolism in rats. (Korean J Nutrition 33(1) : 13-22, 2000)

Keywords

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