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High density lipoprotein metabolism in endurance athletes and sedentary men.

Abstract：

BACKGROUND:Endurance athletes have higher high density lipoprotein (HDL) concentrations than sedentary controls. To examine the mechanism for this effect, we compared HDL apoprotein metabolism in 10 endurance athletes aged 34 +/- 6 years (mean +/- SD) and 10 sedentary men aged 36 +/- 8 years. METHODS AND RESULTS:Subjects were maintained on controlled diets for 4 weeks, and metabolic studies using autologously labeled 125I HDL were performed during the final 2 weeks. Lipids and lipoproteins were measured daily during these 2 weeks, and the average of 14 values was used in the analysis. HDL cholesterol (58 +/- 14 versus 41 +/- 10 mg/dl), HDL2 cholesterol (26 +/- 10 versus 12 +/- 8 mg/dl), and apolipoprotein A-I (apo A-I) (144 +/- 18 versus 115 +/- 22 mg/dl) were higher in the athletes, whereas triglyceride concentrations (60 +/- 18 versus 110 +/- 48 mg/dl) were lower (p less than 0.01 for all). Postheparin lipoprotein lipase activity was not different, but hepatic triglyceride lipase activity was 27% lower (p less than 0.06) in the athletes. The athletes' mean clearance rate of triglycerides after an infusion of Travamulsion (1 ml/kg) was nearly twofold that of the inactive men (5.8 +/- 1.5 versus 3.2 +/- 0.9%/min, p less than 0.001). There was no differences in HDL apoprotein synthetic rates, whereas the catabolic rates of both apo A-I (0.15 +/- 0.02 versus 0.22 +/- 0.05 pools per day, p less than 0.01) and apolipoprotein A-II (apo A-II) (0.15 +/- 0.02 versus 0.20 +/- 0.04 pools per day, p less than 0.05) were reduced in the trained men. Apo A-I and apo A-II half-lives correlated with HDL cholesterol in each group (r greater than 0.76, p less than 0.05 for all) but not consistently with lipase activities or fat clearance rates. This relation between apoprotein catabolism and HDL cholesterol was strongest at HDL cholesterol concentrations of less than 60 mg/dl. CONCLUSIONS:We conclude that higher HDL levels in active men are associated with increased HDL protein survival. The mechanisms mediating this effect require better definition, and other factors appear to contribute to HDL cholesterol and protein concentrations among individual subjects.

journal_name

Circulation

journal_title

Circulation

authors

Thompson PD,Cullinane EM,Sady SP,Flynn MM,Chenevert CB,Herbert PN

doi

10.1161/01.cir.84.1.140

subject

Has Abstract

pub_date

1991-07-01 00:00:00

pages

140-52

issue

eissn

0009-7322

issn

1524-4539

journal_volume

pub_type

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High density lipoprotein metabolism in endurance athletes and sedentary men.