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Countermeasures against post‐exercise syncope
Author(s) -
Buck Tahisha M,
Lacewell Alisha N,
Halliwill John R
Publication year - 2013
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.27.1_supplement.1203.15
Subject(s) - medicine , anesthesia , heart rate , cardiology , oxygenation , blood pressure , breathing
Following exercise, a decrease in central blood volume can compromise cerebral perfusion and result in syncope. Breathing through an impedance threshold device (ITD) has been shown to restore central blood volume under several hypovolemic conditions. Therefore, we hypothesized that ITD breathing would prevent post‐exercise syncope following a 1‐min Wingate test. We studied 19 recreationally active men and women, subjecting them to a 60° head‐up tilt during recovery from the Wingate test. Measurements included arterial pressure, heart rate, end‐tidal PCO 2 , and cerebral tissue oxygenation index on a control and breathing intervention (ITD) day. Mean arterial pressure was greater during the last 30 sec of head‐up tilt on the ITD day compared to the control day (97.1 ± 2.1 vs 91.9 ± 1.8 mm Hg; P < 0.05). Cerebral tissue oxygenation tended to be greater during the last 30 sec of head‐up tilt on the ITD day compared to the control day (71.8 ± 0.6 vs 70.7 ± 0.8 mm Hg; P = 0.07). The length of head‐up tilt was compared between study days for each subject. When contrasting this difference, the ITD lengthened the median tilt time by 7 min 20 sec ( P = 0.20). These data suggest that the ITD may be beneficial in preventing post‐exercise syncope induced by a Wingate exercise model.