Effects of protein addition to carbohydrate–electrolyte solutions on postexercise rehydration

Liang LI, Stephen Heung Sang WONG, Fenghua SUN

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6 Citations (Scopus)

Abstract

This study aimed to examine the effects of the addition of whey or casein protein, the two major proteins in milk, to carbohydrate–electrolyte (CE) solutions on postexercise rehydration. Ten young men aged 20.7 ± 1.4 years with an average VO2max of 60.7 mL/kg/min ran for 60 minutes at 65% VO2max on three occasions followed by 4 hours recovery. During recovery, the participants consumed either CE solution with 66 g/L carbohydrate (CHO), or CE plus whey protein solution (CW trial, 44 g/L CHO, 22 g/L whey), or CE plus casein protein solution (CC trial, 44 g/L CHO, 22 g/L casein); the solutions were matched for energy and electrolyte content. The participants lost 2.36 ± 0.32% of their pre-exercise body weight after the exercise. Total urine output after recovery was greater in the CE and CC trials than CW trial (CE vs. CW vs. CC: 1184 ± 378 mL vs. 1005 ± 214 mL vs. 1256 ± 413 mL; p < 0.05). Fluid retention after ingestion of CW solution was greater than CE and CC solutions (CE vs. CW vs. CC: 46.9 ± 16.5% vs. 54.9 ± 9.2% vs. 45.8 ± 17.3%; p < 0.05). Lower urine specific gravity and urine osmolality were observed by the end of recovery in the CE trial compared with CW trial (p < 0.05). No difference was found in the changes in plasma volume in all trials. These results suggest that during the 4 hours recovery after a 60-minute run, the CW solution was more effective for rehydration compared with the CE or CC solution. Copyright © 2015 Published by Elsevier (Singapore) Pte Ltd.
Original languageEnglish
Pages (from-to)8-15
JournalJournal of Exercise Science & Fitness
Volume13
Issue number1
Early online dateJan 2015
DOIs
Publication statusPublished - 2015

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Fluid Therapy
Proteins
Caseins
Urine
Exercise
Specific Gravity
Plasma Volume
Milk Proteins
Singapore
Osmolar Concentration
Electrolytes
Eating
Body Weight
Carbohydrates

Citation

Li, L., Wong, S. H.-S., & Sun, F.-H. (2015). Effects of protein addition to carbohydrate–electrolyte solutions on postexercise rehydration. Journal of Exercise Science & Fitness, 13(1), 8–15.

Keywords

  • Carbohydrate–electrolyte solutions
  • Casein protein
  • Rehydration
  • Whey protein