TY - JOUR T1 - Sodium ingestion and hyponatraemia: sports drinks do not prevent a fall in serum sodium concentration during exercise JF - British Journal of Sports Medicine JO - Br J Sports Med SP - 372 LP - 372 DO - 10.1136/bjsm.2005.022400 VL - 40 IS - 4 AU - J Dugas Y1 - 2006/04/01 UR - http://bjsm.bmj.com/content/40/4/372.1.abstract N2 - In a well controlled and designed study, Baker et al1 clearly showed the effects of ingesting large volumes of water or a carbohydrate/electrolyte sports drink (CES) on serum Na+ concentration ([Na+]) during exercise in older, active adults (54–70 years). The data show that ingesting any hypotonic fluid, be it water or a Na+-containing sports drink (about 18 mmol/l), in volumes that are similar to or more than weight losses produces a fall in [Na+]—a finding that mirrors the study of Twerenbold et al published in this journal.2 Readers should know that any fluid of concentration less than 150 mmol/l is considered to be hypotonic to the plasma. In the study of Baker et al,1 the ingestion of a CES produced a lower … ER -