Sweat rates and sweat sodium concentrations in athletes

Study of sweat rate and sweat sodium loss in professional athletes, illustrating the wide between-person variability: sweat sodium concentration commonly ranges from roughly 350 to 1800 mg per litre. This variability is why blanket electrolyte advice is unreliable and why heavy, salty sweaters in long, hot efforts are the group with a real case for supplementation. Moderate.