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Comparative Study
Journal Article
High density lipoprotein in octogenarians.
Biochemical Medicine 1983 October
High density lipoprotein (HDL) cholesterol, total cholesterol, and total triglyceride levels were assayed in the plasma of 42 octogenarians. No differences were found in the levels of HDL cholesterol and total triglycerides when comparing subjects with and without ischemic heart disease. The average lipid profile of males in this age group shows significantly lower levels of triglycerides and total cholesterol when compared with the females. HDL cholesterol levels were 10% higher in the females. The distribution pattern of HDL cholesterol levels in this age group suggests a bimodal distribution with 85% of the population distributed around a low peak of 53 mg% and 15% around a high peak of greater than 70 mg%. This pattern suggests that the hyperalphalipoproteinemia phenotype does exist as a separate entity in a population demonstrating longevity, but its low incidence cannot provide an explanation for longevity in the majority of subjects. Subfractionation of HDL was performed by preparative ultracentrifugation and the subfraction profile of 17 female octogenarians was compared with a group of young controls. The younger individuals had greater fat to protein ratios in the HDL-1 and HDL-2 subfractions. This was only difference in lipoprotein composition. We conclude that neither the total level of HDL particles nor the distribution of lipoprotein components among the subfractions can account for the longevity of the majority of the study population.
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