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Water intoxication: a possible complication during endurance exercise.

T D Noakes, N Goodwin, B L Rayner

Medicine and Science in Sports and Exercise

|June 1, 1985

Summary

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Athletes can develop hyponatremia from drinking too much during endurance events. Reducing fluid intake helped prevent this condition in subsequent events.

Area of Science:

Sports Medicine
Exercise Physiology
Endocrinology

Background:

Endurance events lasting over 7 hours pose risks for athletes.
Hyponatremia, or water intoxication, is a serious condition linked to prolonged physical exertion.

Observation:

Four athletes experienced hyponatremia during ultra-endurance events.
This occurred despite moderate sweat sodium losses, suggesting fluid intake was a primary factor.

Findings:

Voluntary hyperhydration with hypotonic fluids contributed to the athletes' hyponatremia.
The mechanism preventing increased urinary excretion of excess fluid remains unclear.

Implications:

Athletes in prolonged endurance events should carefully manage fluid intake to prevent hyponatremia.

Related Experiment Videos

Further research is needed to understand the physiological regulation of fluid balance during extreme exercise.