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Whey protein addition to a carbohydrate-electrolyte rehydration solution ingested after exercise in the heat.

Abstract

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.

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  • Authors+Show Affiliations

    ,

    School of Science and Technology, Nottingham Trent University, Nottinghamshire, UK. lewisJames@ntu.ac.uk

    ,

    Source

    MeSH

    Beverages
    Dietary Carbohydrates
    Electrolytes
    Exercise
    Fluid Therapy
    Hot Temperature
    Humans
    Male
    Milk Proteins
    Rehydration Solutions
    Sweating
    Water-Electrolyte Balance
    Whey Proteins
    Young Adult

    Pub Type(s)

    Clinical Trial
    Journal Article
    Randomized Controlled Trial

    Language

    eng

    PubMed ID

    22488231

    Citation

    James, Lewis J., et al. "Whey Protein Addition to a Carbohydrate-electrolyte Rehydration Solution Ingested After Exercise in the Heat." Journal of Athletic Training, vol. 47, no. 1, 2012, pp. 61-6.
    James LJ, Gingell R, Evans GH. Whey protein addition to a carbohydrate-electrolyte rehydration solution ingested after exercise in the heat. J Athl Train. 2012;47(1):61-6.
    James, L. J., Gingell, R., & Evans, G. H. (2012). Whey protein addition to a carbohydrate-electrolyte rehydration solution ingested after exercise in the heat. Journal of Athletic Training, 47(1), pp. 61-6.
    James LJ, Gingell R, Evans GH. Whey Protein Addition to a Carbohydrate-electrolyte Rehydration Solution Ingested After Exercise in the Heat. J Athl Train. 2012;47(1):61-6. PubMed PMID: 22488231.
    * Article titles in AMA citation format should be in sentence-case
    TY - JOUR T1 - Whey protein addition to a carbohydrate-electrolyte rehydration solution ingested after exercise in the heat. AU - James,Lewis J, AU - Gingell,Rebecca, AU - Evans,Gethin H, PY - 2012/4/11/entrez PY - 2012/4/11/pubmed PY - 2013/1/17/medline SP - 61 EP - 6 JF - Journal of athletic training JO - J Athl Train VL - 47 IS - 1 N2 - 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. SN - 1938-162X UR - https://www.unboundmedicine.com/medline/citation/22488231/Whey_protein_addition_to_a_carbohydrate_electrolyte_rehydration_solution_ingested_after_exercise_in_the_heat_ L2 - https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22488231/ DB - PRIME DP - Unbound Medicine ER -