Document Detail

Whey protein addition to a carbohydrate-electrolyte rehydration solution ingested after exercise in the heat.
MedLine Citation:
PMID:  22488231     Owner:  NLM     Status:  MEDLINE    
CONTEXT: Many active people finish exercise hypohydrated, so effective rehydration after exercise is an important consideration.
OBJECTIVE: To determine the effects of a rehydration solution containing whey protein isolate on fluid balance after exercise-induced dehydration.
DESIGN: Randomized controlled clinical trial.
SETTING: University research laboratory.
PATIENTS OR OTHER PARTICIPANTS: Twelve healthy men (age = 21 ± 1 years, height = 1.82 ± 0.08 m, mass = 82.71 ± 10.31 kg) participated.
INTERVENTION(S): Participants reduced body mass by 1.86% ± 0.07% after intermittent exercise in the heat and rehydrated with a volume of drink in liters equivalent to 1.5 times their body mass loss in kilograms of a solution of either 65 g/L carbohydrate (trial C) or 50 g/L carbohydrate and 15 g/L whey protein isolate (trial CPl. Solutions were matched for energy density and electrolyte content. Urine samples were collected before and after exercise and for 4 hours after rehydration.
MAIN OUTCOME MEASURE(S): We measured urine volume, drink retention, net fluid balance, urine osmolality, and subjective responses. Drink retention was calculated as the difference between the volume of drink ingested and urine produced. Net fluid balance was calculated from fluid gained through drink ingestion and fluid lost through sweat and urine production.
RESULTS: Total cumulative urine output after rehydration was not different between trial C (1173 ± 481 mL) and trial CP (1180 ± 330 mL) (F(1) = 0.002, P = .96), and drink retention during the study also was not different between trial C (50% ± 18%) and trial CP (49% ± 13%) (t(11) = -0.159, P =.88). At the end of the study, net fluid balance was negative compared with baseline for trial C (-432 ± 436 mL) (t(11) = 3.433, P = .03) and trial CP (-432 ± 302 mL) (t(11) = 4.958, P = .003).
CONCLUSIONS: When matched for energy density and electrolyte content, a solution of carbohydrate and whey protein isolate neither increased nor decreased rehydration compared with a solution of carbohydrate.
Lewis J James; Rebecca Gingell; Gethin H Evans
Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Journal of athletic training     Volume:  47     ISSN:  1938-162X     ISO Abbreviation:  J Athl Train     Publication Date:    2012 Jan-Feb
Date Detail:
Created Date:  2012-04-10     Completed Date:  2013-01-16     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  9301647     Medline TA:  J Athl Train     Country:  United States    
Other Details:
Languages:  eng     Pagination:  61-6     Citation Subset:  IM    
School of Science and Technology, Nottingham Trent University, Nottinghamshire, UK.
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MeSH Terms
Dietary Carbohydrates / administration & dosage*
Fluid Therapy / methods
Hot Temperature
Milk Proteins / administration & dosage*
Rehydration Solutions / administration & dosage*,  chemistry*
Water-Electrolyte Balance*
Young Adult
Reg. No./Substance:
0/Dietary Carbohydrates; 0/Electrolytes; 0/Milk Proteins; 0/Rehydration Solutions; 0/whey protein

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