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Syncope is unrelated to supine and postural hypotension following prolonged exercise

Thumbnail
Awdur
Murrell, Carissa J.
Cotter, James D.
George, Keith
Shave, Rob
Wilson, Luke
Thomas, Kate
Williams, Michael J.
Ainslie, Philip N.
Dyddiad
2011
Math
Article
Cyhoeddwr
Springer Verlag
ISSN
1439-6319
Metadata
Dangos cofnod eitem llawn
Crynodeb
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 m2; V˙V˙ O2 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 (r2 = 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 (r2 = 0.18, r2 = 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.
Cyfnodolyn/trafodion cynhadledd
European Journal of Applied Physiology;
Dyfyniad
Murrell, C.J., Cotter, J.D., George, K., Shave, R., Wilson, L., Thomas, K., Williams, M.J. and Ainslie, P.N. (2011) 'Syncope is unrelated to supine and postural hypotension following prolonged exercise', European Journal of Applied Physiology, 111 (3), pp 469-476
URI
http://hdl.handle.net/10369/4389
Dynodwr Gwrthrych Digidol (DOI)
http://dx.doi.org/10.1007/s00421-010-1671-8
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