Effect of milk protein addition to a carbohydrate–electrolyte rehydration solution ingested after exercise in the heat

James, L.J., Clayton, D. ORCID: 0000-0001-5481-0891 and Evans, G.H., 2011. Effect of milk protein addition to a carbohydrate–electrolyte rehydration solution ingested after exercise in the heat. British Journal of Nutrition, 105 (3), pp. 393-399. ISSN 0007-1145

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The present study examined the effects of milk protein on rehydration after exercise in the heat, via the comparison of energy- and electrolyte content-matched carbohydrate and carbohydrate–milk protein solutions. Eight male subjects lost 1.9 (SD 0.2) % of their body mass by intermittent exercise in the heat and rehydrated with 150 % of their body mass loss with either a 65 g/l carbohydrate solution (trial C) or a 40 g/l carbohydrate, 25 g/l milk protein solution (trial CP). Urine samples were collected before and after exercise and for 4 h after rehydration. Total cumulative urine output after rehydration was greater for trial C (1212 (SD 310) ml) than for trial CP (931 (SD 254) ml) (P<0.05), and total fluid retention over the study was greater after ingestion of drink CP (55 (SD 12) %) than that after ingestion of drink C (43 (SD 15) %) (P,0.05). At the end of the study period, whole body net fluid balance (P<0.05) was less negative for trial CP (20.26 (SD 0.27) litres) than for trial C (20.52 (SD 0.30) litres), and although net negative for both the trials, it was only significantly negative after ingestion of drink C (P<0.05). The results of the present study suggest that when matched for energy density and fat content, as well as for Na and K concentration, and when ingested after exercise-induced dehydration, a carbohydrate–milk protein solution is better retained than a carbohydrate solution. These results suggest that gram-for-gram, milk protein is more effective at augmenting fluid retention than carbohydrate.

Item Type: Journal article
Publication Title: British Journal of Nutrition
Creators: James, L.J., Clayton, D. and Evans, G.H.
Publisher: Cambridge University Press
Date: 2011
Volume: 105
Number: 3
ISSN: 0007-1145
S0007114510003545Publisher Item Identifier
Divisions: Schools > School of Science and Technology
Record created by: Jonathan Gallacher
Date Added: 24 Oct 2017 08:26
Last Modified: 24 Oct 2017 08:28
URI: https://irep.ntu.ac.uk/id/eprint/31856

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