Moderate exercise, postprandial lipaemia and triacylglycerol clearance.
Moderate intensity exercise reduces postprandial triacylglycerol (TG) concentrations. We tested whether this reflects increased TG clearance. Eight normotriglyceridaemic men, aged 48.3 +/- 7.3 years (mean +/- SD), performed two oral fat tolerance tests (blood samples taken in the fasted state and for six hours after a high-fat meal containing 1.00 g fat, 0.97 g carbohydrate, 58 kJ energy kg-1 fat-free body mass) and two intravenous fat tolerance tests (blood samples in the fasted state and after a bolus injection of Intralipid, 0.1 g fat kg-1 body mass). The afternoon before one oral and one intravenous test, subjects walked briskly for 90 min; no exercise was performed before the control tests. Prior exercise reduced fasting TG concentration similarly in the oral (16 +/- 7 %) (mean +/- SEM) and intravenous (18 +/- 7 %) tests, and reduced postprandial TG concentrations in the oral test by 18 +/- 6 % (all P < 0.05). However, prior exercise did not increase Intralipid clearance (disappearance curve slopes: control, 4.69 +/- 0.49 % min-1; exercise, 4.85 +/- 0.40 % min-1). These data suggest that mechanisms other than increased TG clearance mediate the lower postprandial TG concentrations seen after moderate exercise.
Loughborough University, Loughborough, UK. j.gill@clinmed.gla.ac.uk
J M
JM
Gill
G P
GP
Mees
K N
KN
Frayn
A E
AE
Hardman
D000284:Administration, Oral; D004041:Dietary Fats / Q000008:administration & dosage; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005215:Fasting; D005217:Fat Emulsions, Intravenous / Q000008:administration & dosage; D005230:Fatty Acids, Nonesterified / Q000097:blood; D006801:Humans; D007275:Injections, Intravenous; D008055:Lipids / Q000097:blood; D008074:Lipoproteins / Q000097:blood*; D008297:Male; D008875:Middle Aged; D019518:Postprandial Period / Q000502:physiology*; D014280:Triglycerides / Q000097:blood* / Q000493:pharmacokinetics; D016138:Walking / Q000502:physiology
D004041:Dietary Fats; D005217:Fat Emulsions, Intravenous; D005230:Fatty Acids, Nonesterified; D008055:Lipids; D008074:Lipoproteins; D014280:Triglycerides