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Related Experiment Video

Updated: Jul 6, 2026

Assessing Cerebral Autoregulation via Oscillatory Lower Body Negative Pressure and Projection Pursuit Regression
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Regional blood flow during periodic acceleration.

J A Adams1, M J Mangino, J Bassuk

  • 1Division of Neonatology, Mount Sinai Medical Center, Miami Beach, FL, USA.

Critical Care Medicine
|October 6, 2001
PubMed
Summary

Noninvasive periodic acceleration (pGz) forces significantly increase blood flow to multiple organs in pigs, potentially through vasodilation. These effects are reversible and may benefit conditions with low tissue oxygen delivery.

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Area of Science:

  • Physiology
  • Biomedical Engineering

Background:

  • Assessing the physiological impact of noninvasive mechanical forces on circulation is crucial for understanding potential therapeutic applications.
  • Periodic acceleration (pGz) is a novel method to apply inertial forces noninvasively.

Purpose of the Study:

  • To investigate if periodic acceleration (pGz) induces systemic vasodilation and alters local organ blood flow.
  • To determine the reversibility of these circulatory changes and explore potential mechanisms.

Main Methods:

  • A prospective, paired, blocked design study was conducted using anesthetized juvenile Yorkshire pigs.
  • Pigs were subjected to periodic acceleration (pGz) at 4 Hz and 0.4 G on a motion platform.
  • Regional blood flows were measured using colored microspheres, and serum nitrite levels were analyzed.

Main Results:

  • pGz significantly increased blood flow to the epicardium, endocardium, cerebrum, brain stem, renal cortex, ileal mucosa, gastric antral mucosa, and liver.
  • Spleen and skeletal muscle blood flow also increased, though not always to statistical significance.
  • Serum nitrite concentration increased significantly during pGz, while heart rate, blood gases, and blood pressure remained unchanged. Blood flow returned to baseline post-intervention, except in myocardial layers.

Conclusions:

  • Periodic sinusoidal inertial forces applied via pGz increase tissue blood flow, likely due to vasodilation mediated by local factors.
  • The observed increase in blood flow is reversible.
  • These findings suggest potential clinical applications for pGz in conditions characterized by poor tissue perfusion and oxygen delivery.