Postprandial lipemia in young men and women of contrasting training status.
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) microIU/ml x 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.
Herd
S L
SL
Human Muscle Metabolism Research Group, Department of Physical Education, Sports Science and Recreation Management, United Kingdom.
Lawrence
J E
JE
Malkova
D
D
Murphy
M H
MH
Mastana
S
S
Hardman
A E
AE
D000293:Adolescent; D000328:Adult; D002784:Cholesterol / Q000097:blood; D003430:Cross-Sectional Studies; D004032:Diet; D004041:Dietary Fats / Q000008:administration & dosage / Q000097:blood*; D015444:Exercise / Q000502:physiology*; D005215:Fasting / Q000502:physiology; D005260:Female; D006801:Humans; D007328:Insulin / Q000097:blood; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D019518:Postprandial Period / Q000502:physiology*; D012420:Running / Q000502:physiology; D012737:Sex Factors; D014280:Triglycerides / Q000097:blood
D004041:Dietary Fats; D007328:Insulin; D014280:Triglycerides; D002784:Cholesterol