GLOSSARY

Sweat Electrolyte Composition Table

Sweat contains several electrolytes, but sodium and chloride usually dominate the electrolyte-loss calculation in sport.

Sweat Sodium is sodium lost with sweat, varying in concentration among people and distinct from blood sodium.

Sweat volume and ion concentrations vary with person, heat, intensity, acclimation and measurement method. Salt on clothing is not a precise loss estimate, and a local patch may not represent whole-body sweat. Plan replacement from session duration, body-mass changes corrected for drinks and urine, tolerance and validated testing when useful, rather than a subjective impression of heavy sweating alone.

Table salt supplies sodium and chloride, but salt mass differs from sodium mass. Bread, cheese, sauces, canned foods and prepared meals can contribute substantially without tasting extremely salty. Food records use actual servings and label units, including drinks and tablets. Comparing products only by tablet number or an electrolyte claim does not establish equivalent sodium intake or replacement.