Higher prevalence of exercise-associated hyponatremia in triple iron ultra-triathletes than reported for ironman triathletes. The stress-associated hyponatremia is a frequent electrolyte track in endurance athletes. As a rule, the percentage is below 10% of the persons studied.However, a study at 100-mile runners showed a significantly increased percentage and we studied the prevalence of stress-associated hyponatremia at Triple Iron Ultra Triathlets at Triple Iron Germany in Lensahn. Of 31 finishers, 8 athletes (26%) developed a hyponatremia, the details below https://pubmed.ncbi.nlm.nih.gov/22784278/