Issn Print: 0195-9131
Publication Date: 1997/05/01
INTERACTION BETWEEN VOLUME AND SODIUM CONTENT: EFFECTS ON POST-EXERCISE REHYDRATION AND FLUID COMPARTMENT RESTORATION 769
M. D. Phillips; S. P. Mercer; J. B. Mitchell; F. X. Pizza; H. L. Baylies; A. M. Hugues
Excerpt
To examine the effect of the interaction between sodium content and volume of fluid ingested on post-exercise whole body and fluid compartment rehydration (RH), 10 recreationally active males completed trials in which they ingested fluid containing 5% maltodextrin in each of 4 regimens: 1) low volume (100% replacement), low Na+ (25mM) (LL); 2) low volume, high Na+ (50mM) (LH); 3) high volume (150% replacement), low Na+(HL); and 4) high volume, high Na+ (HH). Subjects exercised for 90 min. in a warm environment (35°C) until dehydrated by 2.9% body wt., followed by 180 min. of RH. A bolus of 30% of the volume to be consumed was initially ingested, followed by 5 equal feedings every 30 min. Urine and blood samples were collected and body wt. was measured every 60 min. Blood and urine electrolytes were measured, and fluid compartment (ICF, ECF & ISF) restoration and%Δ PV were calculated using the Cl-, and Hct/Hb methods, respectively. Table
These data indicate that greater Na+ content favors ECF filling at the expense of the ICF and that greater RH can be achieved through larger volumes of fluid, but the addition of Na+ from 25 to 50 mM does not influence overall RH.
Facebook
Twitter
LinkedIn
Email
