Autonomic mechanisms in the initial heart rate response to standing.

  title={Autonomic mechanisms in the initial heart rate response to standing.},
  author={David J. Ewing and L R Hume and Ian W. Campbell and Alan Murray and James M. M. Neilson and Basil F. Clarke},
  journal={Journal of applied physiology: respiratory, environmental and exercise physiology},
  volume={49 5},
Autonomic mechanisms underlying the initial heart rate response to standing were analyzed in nine normal subjects. The normal pattern of response was altered by atropine to a small and gradual R-R interval shortening over 30 beats, with no rebound R-R interval lengthening. With additional propranolol, R-R interval shortening was even less and confined to the first 15-20 beats, whereas propranolol alone did not affect the normal response pattern, showing that this is under vagal control with… CONTINUE READING

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