The effect of a single bout of brisk walking on postprandial lipemia in normolipidemic young adults.
The purpose of this study was to examine the effect of one bout of low-intensity exercise on the lipemic response to a high-fat meal. Twelve (six women, six men) normolipidemic adults aged 25.8 +/- 1.2 years (mean +/- SEM) took part in two trials. In the exercise trial, subjects walked for 2 hours on a treadmill at 30.9% +/- 1.6% of maximal oxygen uptake (VO2 max) 15 hours before ingestion of the test meal. In the control trial, subjects rested the day before the test meal. After a 12-hour fast, blood samples were obtained by venous cannulation before ingestion and hourly after ingestion for 6 hours. Serum was analyzed for triacylglycerol (TG), total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C) and HDL2-C, apolipoproteins (apos) A-I and B, free fatty acids (FFA), free glycerol, glucose, and insulin. TG values were corrected for free glycerol. Fasting serum TG and peak TG concentrations were lower (Wilcoxon, P < .05) for the exercise trial than for the control trial (0.74 +/- 0.03 v 0.92 +/- 0.08 and 1.98 +/- 0.18 v 2.59 +/- 0.32 mmol.L-1, respectively). The total lipemic response (area under the TG/time curve, normalized to the 0-hour level) was 31% +/- 7% lower in the exercise trial (4.28 +/- 0.66 v 6.46 +/- 1.08 mmol.L-1.h, P < .01). No differences were found between trials in the other parameters. These results show that a single bout of low-intensity exercise reduces the extent of postprandial lipemia in normolipidemic young adults. One possible mechanism is enhanced lipoprotein lipase (LPL) activity in the exercised skeletal muscle.
Department of Physical Education, Sports Science and Recreation Management, Loughborough University, Leicestershire, England.
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Aldred
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Perry
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Hardman
D000328:Adult; D001786:Blood Glucose / Q000378:metabolism; D008076:Cholesterol, HDL / Q000097:blood; D004435:Eating; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005260:Female; D006801:Humans; D008055:Lipids / Q000097:blood*; D008297:Male; D009994:Osmolar Concentration; D012016:Reference Values; D013997:Time Factors; D014280:Triglycerides / Q000097:blood; D016138:Walking
D001786:Blood Glucose; D008076:Cholesterol, HDL; D005230:Fatty Acids, Nonesterified; D008055:Lipids; D014280:Triglycerides