Table 3.

Prevalence of exercise-associated hyponatremia.

Sports	Trial	Prevalence EAH	References
Marathon	Marathon	15%	[82]
	Houston Marathon 2000	<5%	[80]
	Boston Marathon	5%	[83]
	Houston Marathon 2000–2004	>20%	[84]
	Zurich Marathon	<5%	[85]
	Boston Marathon 2001–2018	<5%	[86]
	London Marathon	Up to 22%	[87]
Ultra-Marathon	Ultra-marathon in Asia	38%	[88]
	161 km in North America	30–51%	[89] [90] [91]
Cycling	109 km	12%	[92]
	210–250 km	4.5% (4 to 90 persons)	[93]
Triathlon	Ironman-Triathlon	20%	[69]
	Ironman-Triathlon	1.8–28%	[94,95]
	Triple Ironman	26%	[67]