Cardiovagal regulation during combined hypoxic and orthostatic stress: fainters vs. nonfainters.

@article{Halliwill2005CardiovagalRD,
  title={Cardiovagal regulation during combined hypoxic and orthostatic stress: fainters vs. nonfainters.},
  author={John R Halliwill and Christopher T Minson},
  journal={Journal of applied physiology},
  year={2005},
  volume={98 3},
  pages={1050-6}
}
We tested the hypothesis that individual differences in the effect of acute hypoxia on the cardiovagal arterial baroreflex would determine individual susceptibility to hypoxic syncope. In 16 healthy, nonsmoking, normotensive subjects (8 women, 8 men, age 20-33 yr), we assessed orthostatic tolerance with a 20-min 60 degrees head-upright tilt during both normoxia and hypoxia (breathing 12% O(2)). On a separate occasion, we assessed baroreflex control of heart rate (cardiovagal baroreflex gain… CONTINUE READING
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