The incidence of hyponatremia during prolonged ultraendurance exercise.

@article{Noakes1990TheIO,
  title={The incidence of hyponatremia during prolonged ultraendurance exercise.},
  author={Timothy David Noakes and Robert J. Norman and W. Roger Buck and J D Godlonton and Karen Stevenson and D. E. Pittaway},
  journal={Medicine and science in sports and exercise},
  year={1990},
  volume={22 2},
  pages={165-70}
}
Recent studies have shown that potentially fatal hyponatremia can develop during prolonged exercise. To determine the incidence of hyponatremia in athletes competing in ultradistance events, we measured serum sodium levels in 315 of 626 (50%) runners who were treated for collapse after two 90 km ultramarathon footraces (total starters 20,335; total finishers 18,031) and in 101 of 147 (69%) finishers in a 186 km ultratriathlon. In both races the athletes drank fluids with low sodium chloride… CONTINUE READING

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