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Imbalances in Cardiac Output

The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
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Related Experiment Video

Updated: Jun 23, 2026

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
14:09

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Published on: March 21, 2013

Cardio-postural deconditioning: A model for post-flight orthostatic intolerance.

Andrew P Blaber1, Clinton K Landrock, Philippe A Souvestre

  • 1Simon Fraser University, Burnaby, BC, Canada. ablaber@sfu.ca

Respiratory Physiology & Neurobiology
|April 22, 2009
PubMed
Summary

Younger individuals exhibit superior postural control compared to older adults, demonstrating a more efficient closed-loop motor strategy. This finding may help understand astronaut postural dysfunction after spaceflight.

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Area of Science:

  • Human physiology
  • Neuroscience
  • Aerospace medicine

Background:

  • Post-flight astronauts often experience impaired postural control and reduced orthostatic tolerance.
  • A link between cardiovascular and postural control systems is proposed to influence orthostatic tolerance.
  • A neurophysiological model exists, but requires validation.

Purpose of the Study:

  • To validate a neurophysiological model of postural control.
  • To compare postural sway and blood pressure regulation in young versus elderly adults during quiet standing.

Main Methods:

  • Compared mediolateral (ML) sway and blood pressure (BP) in young and elderly subjects (n=12).
  • Analyzed cross-spectral power and coherence between ML sway and BP in the low-frequency range (0.03-0.07Hz).
  • Utilized Stabilogram Dynamic Analysis to calculate the short-range Hurst coefficient for ML sway.

Main Results:

  • Both groups showed a peak in low-frequency power between ML sway and BP.
  • Only young subjects exhibited signal coherence greater than 0.5.
  • Young subjects had a significantly lower short-range Hurst coefficient for ML sway (0.694±0.068) than elderly subjects (0.812±0.10), indicating more effective motor control.

Conclusions:

  • Younger individuals employ a more efficient closed-loop motor control strategy for postural stability.
  • The findings support the neurophysiological model and suggest its relevance for understanding post-flight orthostatic intolerance in astronauts.