Exercise training, lipid regulation, and insulin action: a tangled web of cause and effect

Obesity
William E Kraus, Cris A Slentz

Abstract

Lipids are a strong mediator of coronary artery disease and cardiovascular risk. Although the effects of exercise to improve high-density lipoprotein (HDL) cholesterol and serum triglycerides (TGs) have been known for some time, the effects of different amounts and intensities of exercise on fasting and postprandial serum lipids are little understood. Normal lipid physiology is perturbed in insulin resistant states, where inhibition of lipolysis is impaired, particularly in the postprandial period when excursions in insulin and serum TGs are particularly high. In our STRRIDE (Studies of a Targeted Risk Reduction Intervention through Defined Exercise) study, three important metabolic cardiovascular risk-related variables were improved more by moderate intensity than vigorous-intensity exercise. Moderate-intensity exercise was significantly more effective at lowering TGs and improving insulin sensitivity than was vigorous exercise. Additionally, a composite score for metabolic syndrome improved significantly with low-amount/moderate, but did not with low-amount/vigorous-intensity exercise. That all three of these strong, independent, cardiovascular risk factors were significantly affected by moderate-intensity exercise suggests t...Continue Reading

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