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Related Experiment Videos

Sodium balance modulates thirst in normal man

M S Gordon1, J A Majzoub, G H Williams

  • 1Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA.

Endocrine Research
|February 7, 1998
PubMed
Summary
This summary is machine-generated.

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Dietary sodium balance influences thirst perception in humans. A low-sodium diet, associated with higher angiotensin II (AII), lowers the osmotic threshold for thirst compared to a high-sodium diet.

Area of Science:

  • Physiology
  • Endocrinology
  • Human Nutrition

Background:

  • Angiotensin II (AII) is implicated in thirst control in animals, but its role in humans is less clear.
  • Sodium (Na+) balance affects the renin-angiotensin system, yet its impact on human thirst perception is understudied.

Purpose of the Study:

  • To investigate the relationship between sodium balance, plasma osmolality, and thirst perception in healthy humans.
  • To determine if endogenous or exogenous angiotensin II influences the osmotic threshold for thirst.

Main Methods:

  • Five healthy volunteers underwent 5% saline infusion under controlled low-sodium (LS) and high-sodium (HS) diets.
  • Thirst perception was measured using a visual analogue scale, and analyzed against serum sodium (Na+) levels via linear regression.
Keywords:
Non-programmatic

Related Experiment Videos

  • The effect of acute angiotensin II (AII) infusion was also assessed.

    • Main Results:

    • The osmotic threshold for thirst was significantly lower on the LS diet (high endogenous AII) compared to the HS diet (low endogenous AII).
    • No significant extracellular volume changes were observed between diets.
    • Exogenous AII infusion did not alter the osmotic threshold, potentially due to its pressor effects.

    Conclusions:

    • Sodium balance, potentially mediated by endogenous AII, plays a physiological role in regulating thirst in humans.
    • The osmotic threshold for thirst is sensitive to dietary sodium intake.
    • Further research is needed to clarify the dipsogenic effects of AII in humans.