Microgravity decreases heart rate and arterial pressure in humans.

@article{FritschYelle1996MicrogravityDH,
  title={Microgravity decreases heart rate and arterial pressure in humans.},
  author={Janice M. Fritsch-Yelle and John B. Charles and Mark M. Jones and Margie L. Wood},
  journal={Journal of applied physiology},
  year={1996},
  volume={80 3},
  pages={910-4}
}
Spaceflight causes adaptive changes in cardiovascular physiology, such as postflight orthostatic intolerance, that can have deleterious effects on astronauts. In-flight cardiovascular data are difficult to obtain, and results have been inconsistent. To determine normative in-flight changes in Shuttle astronauts, we measured heart rate, arterial pressure, and cardiac rhythm disturbances for 24-h periods before, during, and after spaceflight on Shuttle astronauts performing their normal routines… CONTINUE READING
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