Document Detail

Syncope is unrelated to supine and postural hypotension following prolonged exercise.
MedLine Citation:
PMID:  20886226     Owner:  NLM     Status:  In-Data-Review    
Syncope is widely reported following prolonged exercise. It is often assumed that the magnitude of exercise-induced hypotension (post-exercise hypotension; PEH), and the hypotensive response to postural change (initial orthostatic hypotension; IOH) are predictors of syncope post-exercise. The aim of this study was to determine the relationship between PEH, IOH, the residual IOH and syncope following prolonged exercise. Blood pressure (BP; Finometer) was measured continuously in 19 athletes (47 ± 20 years; BMI: 23.2 ± 2.2 kg m(2); [Formula: see text]O(2) max: 51.3 ± 10.8 mL kg(-1) min(-1)) whilst supine and during head-up tilt (HUT) to 60° for 15 min (or to syncope), prior to and following 4 h of running at 70-80% maximal heart rate. Syncope developed in 15 of 19 athletes post-exercise [HUT-time completed, Pre: 14:39 (min:s) ± 0:55; Post: 5:59 ± 4:53; P < 0.01]. PEH was apparent (-7 ± 7 mmHg; -8 ± 8%), but was unrelated to HUT-time completed (r (2) = 0.09; P > 0.05). Although the magnitude of IOH was similar to post-exercise [-28 ± 12 vs. -20 ± 14% (pre-exercise); P > 0.05], the BP recovery following IOH was incomplete [-9 ± 9 vs. -1 ± 11 (pre-exercise); P < 0.05]; however, neither showed a relation to HUT-time completed (r (2) = 0.18, r (2) = 0.01; P > 0.05, respectively). Although an inability to maintain BP is a common feature of syncope post-exercise, the magnitude of PEH, IOH and residual IOH do not predict time to syncope. Practically, endurance athletes who present with greater hypotension are not necessarily at a greater risk of syncope than those who present with lesser reductions in BP.
Carissa J Murrell; James D Cotter; Keith George; Robert Shave; Luke Wilson; Kate Thomas; Michael J A Williams; Philip N Ainslie
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Publication Detail:
Type:  Journal Article     Date:  2010-10-01
Journal Detail:
Title:  European journal of applied physiology     Volume:  111     ISSN:  1439-6327     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-02-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  469-76     Citation Subset:  IM    
Department of Physiology, University of Otago, 270 Great King St, Dunedin, 9054, New Zealand,
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