Independent and interactive effects of Apolipoprotein E phenotype and cardiorespiratory fitness on plasma lipids

Kathryn H. Schmitz, Pamela J. Schreiner, David R. Jacobs, Arthur S. Leon, Kiang Liu, Barbara Howard, Barbara Sternfeld

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

PURPOSE: To examine whether the association Apolipoprotein E (Apo E) phenotype with plasma lipids is influenced by physical fitness level. Also, to explore the interactive and independent relative contributions of Apo E phenotype, fitness (or physical activity), and other modifiable factors to variation in plasma low density lipoprotein (LDL-C) and high density lipoprotein (HDL-C) levels at baseline and over a seven-year follow-up. METHODS: Physical fitness (duration of a graded treadmill test), Apo E phenotype, plasma LDL-C and HDL-C, and covariates were measured at baseline and seven years later in a bi-racial cohort of young adults, aged 18-30 years at baseline in 1985-86 (N = 3629), from the Coronary Artery Risk Development In Young Adults (CARDIA) study. RESULTS: Fitness did not influence the associations of Apo E and LDL-C or HDL-C. The independent effects of several modifiable variables (changes in Keys' score, smoking, oral contraceptive use, education, body weight, alcohol intake, and fitness), when combined, contributed considerably more than Apo E to the variance in LDL-C changes (6.74% or 8.71% for combined modifiable variables vs. 1.27% or 0.90% for ApoE, in women or men, respectively) and HDL-C changes (13.11% or 12.66% for combined modifiable variables vs. 0.12% or 0.02% for ApoE, in women or men, respectively). The pattern of findings was similar when self-reported physical activity was substituted for fitness. CONCLUSIONS: Changes in modifiable factors, including fitness, may be stronger correlates of changes in LDL-C and HDL-C over time than the immutable factor, Apo E phenotype.

Original languageEnglish (US)
Pages (from-to)94-103
Number of pages10
JournalAnnals of epidemiology
Volume11
Issue number2
DOIs
StatePublished - 2001

Bibliographical note

Funding Information:
The CARDIA Study was funded by NIH contracts NO1-HC-48047 through 48050 from the US National Heart Lung, and Blood Institute (NHLBI). Dr. Kathryn H. Schmitz was supported by a University of Minnesota Graduate School Doctoral Dissertation Fellowship and NHLBI Training Grant 32–HL07036 while working on this manuscript. Special thanks to Peter, Mack, and Tommy Schmitz.

Keywords

  • Apolipoprotein E
  • Exercise
  • Lipoproteins

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