Whey or Casein Hydrolysate with Carbohydrate for Metabolism and Performance in Cycling

May 6, 2015International journal of sports medicine

Whey or Casein Protein with Carbohydrates and Their Effects on Metabolism and Cycling Performance

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Abstract

Co-ingestion of carbohydrate-casein hydrolysate during exercise resulted in a significant decrease in total carbohydrate oxidation.

Total carbohydrate oxidation was substantially lower with carbohydrate-casein hydrolysate compared to carbohydrate-only.
Fat oxidation was significantly higher with carbohydrate-casein hydrolysate than with carbohydrate-only.
Carbohydrate-casein hydrolysate ingestion led to a faster time trial compared to placebo-water.
Neither protein hydrolysate improved time trial performance when compared to carbohydrate-only.
Exogenous carbohydrate oxidation was not notably influenced by either protein hydrolysate.

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The protein type most suitable for ingestion during endurance exercise is undefined. This study compared co-ingestion of either 15 g/h whey or casein hydrolysate with 63 g/h fructose: maltodextrin (0.8:1) on exogenous carbohydrate oxidation, exercise metabolism and performance. 2 h postprandial, 8 male cyclists ingested either: carbohydrate-only, carbohydrate-whey hydrolysate, carbohydrate-casein hydrolysate or placebo-water in a crossover, double-blind design during 2 h of exercise at 60%W max followed by a 16-km time trial. Data were evaluated by magnitude-based inferential statistics. Exogenous carbohydrate oxidation, measured from (13)CO2 breath enrichment, was not substantially influenced by co-ingestion of either protein hydrolysate. However, only co-ingestion of carbohydrate-casein hydrolysate substantially decreased (98% very likely decrease) total carbohydrate oxidation (mean±SD, 242±44; 258±47; 277±33 g for carbohydrate-casein, carbohydrate-whey and carbohydrate-only, respectively) and substantially increased (93% likely increase) total fat oxidation (92±14; 83±27; 73±19 g) compared with carbohydrate-only. Furthermore, only carbohydrate-casein hydrolysate ingestion resulted in a faster time trial (-3.6%; 90% CI: ±3.2%) compared with placebo-water (95% likely benefit). However, neither protein hydrolysate enhanced time trial performance when compared with carbohydrate-only. Under the conditions of this study, ingesting carbohydrate-casein, but not carbohydrate-whey hydrolysate, favourably alters metabolism during prolonged moderate-strenuous cycling without substantially altering cycling performance compared with carbohydrate-only.

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Whey or Casein Hydrolysate with Carbohydrate for Metabolism and Performance in Cycling

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