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J Appl Physiol 89: 2049-2056, 2000;
8750-7587/00 $5.00
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Vol. 89, Issue 5, 2049-2056, November 2000

Postprandial lipemia in young men and women of contrasting training status

Sara L. Herd1, Janet E. M. Lawrence1, Dale Malkova1, Marie H. Murphy2, Sarabjit Mastana3, and Adrianne E. Hardman1

1 Human Muscle Metabolism Research Group, Department of Physical Education, Sports Science and Recreation Management, 3 Department of Human Sciences, Loughborough University, Loughborough, Leicestershire LE11 3TU, United Kingdom; and 2 Department of Sport and Exercise Sciences, University of Ulster at Jordanstown, Northern Ireland BT37 0QB

This study compared the postprandial triacylglycerol (TAG) response to a high-fat meal in trained and untrained normolipidemic young adults after 2 days' abstinence from exercise. Fifty-three subjects (11 endurance-trained men, 9 endurance-trained women, 10 sprint/strength-trained men, 11 untrained men, 11 untrained women) consumed a meal (1.2 g fat, 1.1 g carbohydrate, 66 kJ per kg body mass) after a 12-h fast. Venous blood samples were obtained in the fasted state and at intervals until 6 h. Postprandial responses were the areas under the plasma or serum concentration-vs.-time curves. Neither fasting TAG concentrations nor the postprandial TAG response differed between trained and untrained subjects. The insulinemic response was 29% lower in endurance-trained men than in untrained men [mean difference -37.4 (95% confidence interval -62.9 to -22.9) µIU/ml × h, P = 0.01]. Responses of plasma glucose, serum insulin, and plasma nonesterified fatty acids were all lower for endurance-trained men than for untrained men. These findings suggest that, in young adults, no effect of training on postprandial lipemia can be detected after 60 h without exercise. The effect on postprandial insulinemia may persist for longer.

triacylglycerol; insulin; dietary fat; endurance-trained; sprint/strength-trained


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