Brachial artery endothelial responses during early recovery from an exercise bout in patients with coronary artery disease.
This study examined the acute endothelial responses to an exercise bout in coronary artery disease (CAD) patients. Nineteen males with CAD (63 ± 8 years) were assessed at rest and 15 minutes following a submaximal exercise bout (recovery). Brachial artery endothelial-dependent function was assessed using flow-mediated dilation (FMD). Brachial artery diameters and velocities were measured using Duplex ultrasound at baseline, and for 3 minutes following a 5-minute ischemic period. Endothelial-independent function was assessed using a 0.4 mg dose of nitroglycerin (NTG). FMD responses were unchanged from rest to recovery; however, there were 2 types of responses: negative and positive FMD responders. Post-hoc analysis revealed that positive responders had lower resting FMD compared to negative responders (3.2 ± 1.7 versus 6.0 ± 2.5%, P < 0.05). NTG-mediated dilation was reduced in recovery (22.0 ± 5.6 versus 14.4 ± 5.7%, P < 0.001 for rest versus recovery). In conclusion, acute endothelial-dependent responses to submaximal exercise are affected by the degree of resting endothelial dysfunction. The observation of attenuated NTG-mediated dilation during recovery is novel and warrants the investigation of possible mechanisms and clinical significance. Furthermore, it highlights the necessity of both endothelial-dependent and endothelial-independent assessments when evaluating endothelial function changes with an intervention.
Department of Kinesiology, McMaster University, 1280 Main Street West, Hamilton, ON, Canada L8S 4K1.
Katharine D
KD
Currie
Department of Kinesiology, McMaster University, 1280 Main Street West, Hamilton, ON, Canada L8S 4K1 ; Department of Medicine, McMaster University, 1280 Main Street West, Hamilton, ON, Canada L8S 4K1 ; Hamilton Health Sciences, 237 Barton Street East, Hamilton, ON, Canada L8L 2X2.
Robert S
RS
McKelvie
Department of Kinesiology, McMaster University, 1280 Main Street West, Hamilton, ON, Canada L8S 4K1.
Maureen J
MJ
Macdonald
D000368:Aged; D001916:Brachial Artery / Q000000981:diagnostic imaging / Q000503:physiopathology*; D003324:Coronary Artery Disease / Q000000981:diagnostic imaging / Q000188:drug therapy / Q000503:physiopathology*; D004730:Endothelium, Vascular / Q000000981:diagnostic imaging / Q000503:physiopathology*; D015444:Exercise; D006801:Humans; D008297:Male; D008875:Middle Aged; D005996:Nitroglycerin / Q000008:administration & dosage; D014463:Ultrasonography; D014665:Vasodilator Agents / Q000008:administration & dosage
D014665:Vasodilator Agents; D005996:Nitroglycerin