Arterial pressure and lipid profile in rats following chronic ingestion of palm oil diets.
The mean arterial blood pressure (MAP) and plasma lipid profile of rats following chronic consumption of a diet containing 15% palm oil (fresh or oxidized) were studied. Rats were allowed to feed on either a fresh or oxidized palm oil diet for 18 weeks and their effects were compared with a control group receiving normal rat feed. Mean arterial blood pressures were 128.0 +/- 2.3 mmHg (mean +/- SEM) for the control, 135.0 +/- 2.4 mmHg for the fresh-oil fed group and 147 +/- 2.5 mmHg for the oxidized oil-fed group. The oxidized oil-fed group had a significantly greater rise in mean arterial blood pressure than the control and fresh oil-fed groups (P < 0.01 and 0.05, respectively). Mean arterial blood pressure was not significantly elevated in the fresh oil-fed group than the control. Low density lipoprotein cholesterol (LDL) levels were 1.51 +/- 0.07 mMol/L for the control, 1.62 +/- 0.03 mMol/L for the fresh oil-fed group and 1.78 +/- 0.03 mMol/L for the oxidized oil-fed group. The values were not significantly different in the control and the fresh oil groups. LDL level was significantly higher in the oxidized than in the control (P < 0.01) and fresh oil-fed groups (P < 0.05). Total cholesterol for the two test groups were significantly (P < 0.05) higher than the control, while the value in the oxidized oil group was also significantly (P < 0.05) higher than the fresh oil-fed group. There was no significant difference in high density lipoprotein cholesterol (HDLP) levels in the three groups. The significantly elevated MAP in the oxidized oil-fed rats when compared to the fresh oil-fed and control rats may be due to thermoxidation of the fresh oil that produced significantly higher levels of LDL and total cholesterol which predisposes to high blood pressure.
Osim
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Department of Physiology, College of Medical Sciences, University of Calabar, Nigeria.
Owu
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Etta
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D000818:Animals; D001794:Blood Pressure / Q000187:drug effects*; D002784:Cholesterol / Q000097:blood; D008076:Cholesterol, HDL / Q000097:blood; D008078:Cholesterol, LDL / Q000097:blood; D004042:Dietary Fats, Unsaturated / Q000008:administration & dosage* / Q000032:analysis; D006339:Heart Rate / Q000187:drug effects; D007455:Iodine / Q000032:analysis; D008055:Lipids / Q000097:blood*; D008297:Male; D000073878:Palm Oil; D010938:Plant Oils / Q000008:administration & dosage* / Q000032:analysis; D051381:Rats; D017208:Rats, Wistar
D008076:Cholesterol, HDL; D008078:Cholesterol, LDL; D004042:Dietary Fats, Unsaturated; D008055:Lipids; D010938:Plant Oils; D000073878:Palm Oil; D007455:Iodine; D002784:Cholesterol