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Tachyphylaxis is described as a rapid decrease in response to a drug after repeated or continuous administration of the same drug dose. It is a phenomenon where the body becomes less responsive to a particular substance or intervention over time, requiring higher doses or stronger interventions to achieve the same effect. It results from adaptive changes in the body's receptors, signaling pathways, or physiological processes that occur in response to prolonged exposure to a stimulus.
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Gap Junctional Intercellular Communication: A Functional Biomarker to Assess Adverse Effects of Toxicants and Toxins, and Health Benefits of Natural Products
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Reduced G tolerance associated with supplement use.

Patrick D Barker1

  • 1Branch Health Clinic, Naval Air Station Oceana, Virginia Beach, VA, USA. patrick.barker@med.navy.mil

Aviation, Space, and Environmental Medicine
|February 19, 2011
PubMed
Summary
This summary is machine-generated.

Naval aviators taking a new supplement experienced reduced G tolerance, a measure of how much G-force the body can withstand. Stopping the supplement restored normal G tolerance, highlighting the importance of considering supplements in aviation safety.

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Area of Science:

  • Aerospace Medicine
  • Physiology

Background:

  • High G-forces in military aviation necessitate measures to maintain cerebral perfusion and prevent G-induced loss of consciousness (G-LOC).
  • G-LOC poses a significant risk for catastrophic aviation mishaps.

Observation:

  • A Naval Aviator noted decreased G tolerance over two consecutive flights after initiating a new dietary supplement.
  • The supplement contained coenzyme Q10 and niacin, both known for their hemodynamic effects.

Findings:

  • Supplement cessation resulted in the aviator regaining normal G tolerance without further in-flight issues.
  • This case suggests that certain supplement components may alter physiological responses to G-force, reducing tolerance.

Implications:

  • Supplement use should be considered a potential factor in reduced G tolerance among aviators.
  • Understanding supplement-induced physiological changes is crucial for maintaining flight safety and preventing G-LOC incidents.