NDLI: Maintained cerebrovascular function during post-exercise hypotension

Content Provider	Springer Nature Link
Author	Willie, Christopher K. Ainslie, Philip N. Taylor, Chloe E. Eves, Neil D. Tzeng, Yu Chieh
Copyright Year	2013
Abstract	The post-exercise period is associated with hypotension, and an increased risk of syncope attributed to decreases in venous return and/or vascular resistance. Increased local and systemic vasodilators, sympatholysis, and attenuated baroreflex sensitivity following exercise are also manifest. Although resting cerebral blood flow is maintained, cerebrovascular regulation to acute decreases in blood pressure has not been characterized following exercise. We therefore aimed to assess cerebrovascular regulation during transient bouts of hypotension, before and after 40 min of aerobic exercise at 60 % of estimated maximum oxygen consumption. Beat to beat blood pressure (Finometer), heart rate (ECG), and blood velocity in the middle cerebral artery (MCAv; transcranial Doppler ultrasound) were assessed in ten healthy young humans. The MCAv-mean arterial pressure relationship during a pharmacologically (i.v. sodium nitroprusside) induced transient hypotension was assessed before and at 10, 30, and 60 min following exercise. Despite a significant reduction in mean arterial pressure at 10 min post-exercise (−10 ± 6.9 mmHg; P < 0.05) and end-tidal PCO2 (10 min post: −2.9 ± 2.6 mmHg; 30 min post: −3.9 ± 3.5 mmHg; 60 min post: −2.7 ± 2.0 mmHg; all P < 0.05), neither resting MCAv nor the cerebrovascular response to hypotension differed between pre- and post-exercise periods (P > 0.05). These data indicate that cerebrovascular regulation remains intact following a moderate bout of aerobic exercise.
Starting Page	1597
Ending Page	1604
Page Count	8
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	113
Issue Number	6
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2013-01-12
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Exercise Syncope Post-exercise hypotension Cerebral autoregulation Cerebral blood flow Human Physiology Occupational Medicine/Industrial Medicine Sports Medicine
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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