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Exercise-associated hyponatremia: a review.
D B Speedy1, T D Noakes, C Schneider
1Department of General Practice and Primary Care, University of Auckland, New Zealand. dalespeedy@e3.net.nz
Emergency Medicine (Fremantle, W.A.)
|July 31, 2001
Summary
Hyponatremia, a serious complication of endurance exercise, is often caused by fluid overload. Impaired kidney function may contribute, especially in female athletes, necessitating careful management and prevention strategies.
Area of Science:
- Sports Medicine
- Exercise Physiology
- Endocrinology
Background:
- Hyponatremia is a frequent and serious complication in ultra-endurance athletes.
- Fluid overload is the primary suspected cause of exercise-associated hyponatremia.
- While high fluid intake is common, hyponatremia can occur even with moderate fluid consumption.
Purpose of the Study:
- To review the literature on the etiology, risk factors, and management of exercise-associated hyponatremia.
- To explore the role of impaired renal fluid excretion in the development of hyponatremia.
- To discuss strategies for preventing and managing this condition in athletes.
Main Methods:
- Systematic review of existing scientific literature.
- Analysis of studies investigating fluid balance during prolonged exercise.
- Examination of physiological factors contributing to hyponatremia.
Main Results:
- Fluid overload is the most probable cause of exercise-associated hyponatremia.
- Evidence suggests impaired renal capacity to excrete fluid loads may play a role.
- Dilutional hyponatremia, resulting from extracellular fluid retention, is favored over intestinal malabsorption.
- Female gender is identified as a significant risk factor.
Conclusions:
- Exercise-associated hyponatremia is a complex condition linked to fluid overload and potentially impaired renal function.
- Female athletes are at higher risk.
- Effective management and prevention strategies are crucial for athlete safety.