The acute effects of exercise intensity on HDL???C metabolism

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Abstract
To determine whether exercise intensity influences acute HDL-C responses, 12 male recreational runners (24.8 ± 4 yr) who ran 15–30 miles wk−1 exercised on a motor driven treadmill at 60% (L) and 75% (H) VO2max‘ A counterbalanced experimental design was utilized and energy expenditure was 800 Keal. Fasting blood samples were obtained 24 h before exercise (24 PRE), immediately post- (IPE), 1 h post- (1 h PE), 6 h post- (6 h PE), and 24 h post- (24 h PE) exercise and analyzed for HDL-C and HDL2&3-C, In addition, postheparin plasma samples, obtained 24 h PRE, 6 h PE, and 24 h PE were analyzed for lipolytic activity—LPLA and HTGLA. An exercise trial by time interaction was observed for HDL-C (P < 0.01). Post-hoc analysis revealed no change in HDL-C following the L trial. However, an increase in HDL-C was observed 24 h PE (P < 0.01) following the H trial. The increase in HDL-C was attributed to an elevated HDL3-C (P < 0.01), with no change in HDL2-C. Analysis of plasma lipolytic activity revealed an increase in LPLA 24 h PE (P < 0.05) which may be responsible for the postexercise alterations in HDL-C. However, HTGLA decreased 6 h PE (P < 0.01) and 24 h PE (P < 0.05). We conclude that increases in HDL-C levels following endurance activity are influenced, in part, by the exercise intensity.

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