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Moderate exercise reduces serum triacylglycerol concentrations but does not affect pre-heparin lipoprotein lipase concentrations after a moderate-fat meal in young men

Masashi Miyashitaa1 c1 and Kumpei Tokuyamaa1 a1 Division of Sports Medicine, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki, 305-8574, Japan

Article author query miyashita m   tokuyama k

Abstract

Aerobic exercise has been shown to lower postprandial TAG concentrations after a meal(s) of high-fat content. This study examined the effects of moderate-intensity cycling on postprandial TAG concentrations and pre-heparin lipoprotein lipase concentrations after subjects consumed a meal of moderate-fat content (45 % of total energy). Twelve male subjects, aged 24 (sem 1) years, completed two 2 d trials (exercise and control) at least 1 week apart in a randomised, repeated measures design. On day 1, subjects either cycled for 30 min at 65 % of maximum heart rate in the afternoon or rested (no exercise). On day 2 of both trials, after an overnight stay with an 11 h fast, subjects consumed a test meal of moderate-fat content (0·61 g fat, 1·34 g carbohydrate, 0·37 g protein and 51 kJ energy/kg body mass) for breakfast. Blood samples were collected at baseline (before the exercise or at an equivalent time-point during the control trial on day 1), in the fasted state (0 h) and at 2, 4 and 6 h postprandially on day 2. The total and incremental areas under the serum TAG concentration v. time curve were 30 % (P = 0·039) and 33 % (P = 0·012) lower on the exercise trial compared with the control trial, respectively. Serum pre-heparin lipoprotein lipase concentrations did not differ between the exercise and control trials. These findings demonstrate that 30 min of moderate-intensity cycling performed the day before a meal of moderate-fat content is effective at lowering postprandial serum TAG concentrations but does not affect serum pre-heparin lipoprotein lipase concentrations in young men.

(Received May 16 2007)

(Revised September 20 2007)

(Accepted September 21 2007)

(Online publication October 26 2007)

Key Words:Physical activity; Lipid metabolism; Cardiovascular disease risk; Pre-heparin lipoprotein lipase

Correspondence:

^c1 Corresponding author: Dr Masashi Miyashita, fax +81 29 8536507, email miyashita@eiyou.taiiku.tsukuba.ac.jp

Footnotes

Abbreviations: LPL, lipoprotein lipase