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Isolation and Analysis of Plasma Lipoproteins by Ultracentrifugation
06:47

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Published on: January 28, 2021

Changes in lipoprotein profiles during intense military training.

B L Smoak1, J P Norton, E W Ferguson

  • 1Department of Military Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD 20814-4799.

Journal of the American College of Nutrition
|December 1, 1990
PubMed
Summary

Intense military training significantly alters lipoprotein profiles in Navy trainees. Even with high-fat diets, physical conditioning and severe stress impact cholesterol and high-density lipoprotein (HDL) levels.

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Area of Science:

  • Exercise Physiology
  • Cardiovascular Health
  • Nutritional Biochemistry

Background:

  • Lipoprotein concentrations are key indicators of cardiovascular risk.
  • Intense physical training and stress can significantly impact physiological markers.
  • Understanding these effects is crucial for military personnel health.

Purpose of the Study:

  • To investigate the effects of intense military training on lipoprotein profiles.
  • To assess changes after physical conditioning and severe stress.
  • To correlate these changes with dietary intake.

Main Methods:

  • Monitored 44 Navy trainees over 5 weeks of physical conditioning and 5 days of intense stress.
  • Collected dietary intake and lipoprotein profiles (total cholesterol, triglycerides, HDL, LDL) before and after training phases.
  • Analyzed changes in body weight, diet composition, and lipid concentrations.

Main Results:

  • Physical conditioning increased high-density lipoprotein (HDL) by 31%.
  • Severe stress decreased total cholesterol (17.2%) and low-density lipoprotein (LDL) (30%), while increasing HDL (12.1%).
  • No significant changes in body weight were observed, despite high saturated fat and cholesterol intake.

Conclusions:

  • Both long-term physical conditioning and short-term intense stress induce significant changes in lipoprotein profiles.
  • These alterations occur even with consistently high intakes of energy, fat, and cholesterol.
  • Findings highlight the profound impact of strenuous military training on cardiovascular risk factors.