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Journal of Strength & Conditioning Research:
doi: 10.1519/JSC.0000000000000657
Original Investigation: PDF Only

Effect of electrolyte addition to rehydration drinks consumed after severe fluid and energy restriction.

James, Lewis J.; Shirreffs, Susan M.

Published Ahead-of-Print
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Abstract

This study examined the effect of electrolyte addition to drinks ingested after severe fluid and energy restriction (FER). Twelve subjects (six male, six female) completed three trials consisting of 24 h FER (energy intake: 21 kJ[middle dot]kg-1 body mass; water intake: 5 ml[middle dot]kg-1 body mass), followed by a 2 h rehydration period and a 4 h monitoring period. During rehydration, subjects ingested a volume of drink equal to 125% of the body mass lost during FER in 6 aliquots, once every 20 min. Drinks were a sugar free lemon squash (P) or the P drink with the addition of 50 mmol[middle dot]l-1 sodium chloride (Na) or 30 mmol[middle dot]l-1 potassium chloride (K). Total void urine samples were given before and after FER and every hour during rehydration and monitoring. Over all trials, FER produced a 2.1% reduction in body mass and negative sodium (-67 mmol), potassium (-48 mmol) and chloride (-84 mmol) balances. Urine output after drinking was 1627 (540) ml (P), 1391 (388) ml (K) and 1150 (438) ml (Na), with a greater post-drinking urine output during P than Na (P<0.05). Ingestion of drink Na resulted in a more positive sodium balance compared to P or K (P<0.001), whilst ingestion of drink K resulted in a more positive potassium balance compared to P or Na (P<0.001). These results demonstrate that after 24 h FER, ingestion of a high sodium drink results in an increased sodium balance that augments greater drink retention compared to a low electrolyte placebo drink.

Copyright (C) 2014 by the National Strength & Conditioning Association.

 

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