Effects of prior moderate exercise on postprandial metabolism and vascular function in lean and centrally obese men.
OBJECTIVE
We investigated whether a session of prior exercise could ameliorate postprandial endothelial dysfunction.


BACKGROUND
Endothelial function is impaired after fat ingestion, and this may be related to rises in triglyceride concentrations. Exercise reduces postprandial triglyceride concentrations.


METHODS
Ten lean (waist <90 cm) and 10 centrally obese (waist >100 cm) middle-aged men each underwent two oral fat tolerance tests (blood taken fasting and for 8 h after a high-fat meal containing 80 g fat and 70 g carbohydrate). On the afternoon before one test, subjects performed a 90-min treadmill walk (exercise); no exercise was performed before the control test. Endothelium-dependent and -independent microvascular function was assessed using laser Doppler imaging in the fasted state and at two hourly intervals during the 8-h postprandial period.


RESULTS
Exercise reduced both fasting and postprandial triglyceride concentrations by 25% in both the lean and centrally obese groups (p < 0.0005). For all subjects taken together, exercise improved fasting endothelium-dependent function by 25% (p < 0.05), and, although there was a significant postprandial decrease in both endothelium-dependent and -independent function in both the control and exercise trials (p < 0.01), postprandial endothelium-dependent and -independent function were 15% and 20% higher, respectively, in the exercise trial than the control trial (both p < 0.05).


CONCLUSIONS
A session of prior exercise improves fasting and postprandial vascular function in middle-aged men. This may be one mechanism by which exercise influences cardiovascular risk.
Gill
Jason M R
JM
Department of Vascular Biochemistry, University of Glasgow, Glasgow Royal Infirmary, Glasgow G12 8QQ, Scotland, UK.
Al-Mamari
Ali
A
Ferrell
William R
WR
Cleland
Stephen J
SJ
Packard
Chris J
CJ
Sattar
Naveed
N
Petrie
John R
JR
Caslake
Muriel J
MJ
D000109:Acetylcholine / Q000494:pharmacology; D000328:Adult; D001808:Blood Vessels / Q000503:physiopathology*; D004730:Endothelium, Vascular / Q000503:physiopathology; D015444:Exercise; D005215:Fasting / Q000097:blood; D006801:Humans; D015850:Interleukin-6 / Q000097:blood; D007958:Leukocyte Count; D008297:Male; D008833:Microcirculation / Q000187:drug effects; D008875:Middle Aged; D009599:Nitroprusside / Q000494:pharmacology; D009765:Obesity / Q000378:metabolism / Q000503:physiopathology*; D009994:Osmolar Concentration; D019518:Postprandial Period; D013851:Thinness / Q000378:metabolism / Q000503:physiopathology*; D014280:Triglycerides / Q000097:blood; D014665:Vasodilator Agents / Q000494:pharmacology; D016138:Walking
D015850:Interleukin-6; D014280:Triglycerides; D014665:Vasodilator Agents; D009599:Nitroprusside; D000109:Acetylcholine