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Inhibited breathing decreases renal sodium excretion
D E Anderson1, A Y Bagrov, J L Austin
1Behavioral Medicine Section, National Institute on Aging, Baltimore, Maryland 21224, USA.
Psychosomatic Medicine
|July 1, 1995
Summary
Breathing to increase end-tidal carbon dioxide (CO2) in the normal range reduces kidney sodium and water excretion. This finding suggests a link between breathing patterns, sodium retention, and potential roles in hypertension.
Area of Science:
- Physiology
- Nephrology
- Respiratory Medicine
Background:
- End-tidal carbon dioxide (CO2) levels influence physiological processes.
- Renal sodium excretion is a key regulator of blood pressure and fluid balance.
- Behavioral factors, including breathing patterns, may impact cardiovascular health.
Purpose of the Study:
- To investigate the effect of breathing at the upper limit of normal end-tidal CO2 on renal sodium excretion.
- To explore the potential role of respiratory regulation in sodium balance and blood pressure.
Main Methods:
- Normotensive subjects self-regulated end-tidal CO2 using biofeedback.
- A water-drinking regimen standardized urine flow.
- Urinary volume, sodium, and potassium excretion were measured during inhibited breathing (high normal end-tidal CO2).
Main Results:
- Inhibited breathing significantly decreased urinary volume and sodium excretion.
- Potassium excretion also decreased during the intervention.
- Blood pressure increased, while heart rate remained unchanged.
- Increased urinary excretion of an endogenous digoxin-like factor suggested plasma volume expansion.
Conclusions:
- Breathing patterns that maintain high normal end-tidal CO2 can lead to renal sodium retention.
- This respiratory-induced sodium retention may be linked to behavioral stress in certain hypertensive conditions.
- Further research is needed to elucidate the precise physiological mechanisms involved.