Fig. 2

Relationship between sweat Na⁺ and sweat Cl⁻ concentrations in a group of marathoners. Panel a includes data organized by sex (141 men and 16 women). Panel b includes data of low-salty sweaters (<30 mmol·L⁻¹ of sweat sodium concentration), typical sweaters (≥30 and < 60 mmol·L⁻¹ of sweat sodium concentration) and salty sweaters (≥60 mmol·L⁻¹ of sweat sodium concentration)