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LBNP and push-pull effect.

P Dosel1, J Hanousek, J Petricek

  • 1Department of Flying Safety, Institute of Aviation Medicine, 160 60 Prague 6, Gen. Piky 1, Czech Republic. petrdosel@atlas.cz

Journal of Gravitational Physiology : a Journal of the International Society for Gravitational Physiology
|April 1, 2008
PubMed
Summary
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Pilots experience reduced tolerance to high G-forces after microgravity or negative G exposure due to the push-pull effect. This impairs performance and increases risks like G-induced Loss of Consciousness (G-LOC).

Area of Science:

  • Aerospace Medicine
  • Human Factors Engineering
  • Physiology

Background:

  • Agile aircraft maneuvers involve high G-forces and vector alterations.
  • The push-pull (PP) effect describes altered G-tolerance following microgravity or negative G exposure.
  • Pilot performance and safety are critical in high-G environments.

Purpose of the Study:

  • To investigate the significance of the push-pull (PP) effect in agile aircraft operations.
  • To understand the impact of PP effect on pilot tolerance to positive gravitational acceleration (+Gz).
  • To analyze the consequences of PP effect on pilot performance and G-induced Loss of Consciousness (G-LOC).

Main Methods:

  • Analysis of flight data from agile aircraft with high maneuvering capabilities.

Related Experiment Videos

  • Review of physiological responses during exposure to varying G-levels and preceding conditions (microgravity, negative G).
  • Assessment of pilot performance metrics and G-LOC thresholds.

    • Main Results:

    • A decreased tolerance to +Gz is observed after exposure to microgravity (0 to +0.8 Gz) or negative acceleration.
    • Sympathetic nervous system activation is delayed during +Gz exposure post-PP effect, impairing pilot performance.
    • Thresholds for vision failure and G-LOC are lowered, and gravitational acceleration fatigue is escalated.

    Conclusions:

    • The push-pull effect significantly compromises pilot tolerance and performance in high-G environments.
    • Understanding and mitigating the PP effect is crucial for flight safety in agile aircraft.
    • Delayed physiological responses and reduced G-tolerance necessitate further research into protective strategies for pilots.