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

T. Oosthuyse; M. Carstens; A. M. E. Millen

doi:10.1055/s-0034-1398647

International Journal of Sports Medicine, Inhaltsverzeichnis

Int J Sports Med 2015; 36(08): 636-646
DOI: 10.1055/s-0034-1398647

Physiology & Biochemistry

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

Authors

T. Oosthuyse

¹Exercise Laboratory, School of Physiology, Faculty of Health Sciences, University of the Witwatersrand, Medical School, Johannesburg, South Africa
M. Carstens

¹Exercise Laboratory, School of Physiology, Faculty of Health Sciences, University of the Witwatersrand, Medical School, Johannesburg, South Africa
A. M. E. Millen

¹Exercise Laboratory, School of Physiology, Faculty of Health Sciences, University of the Witwatersrand, Medical School, Johannesburg, South Africa

Abstract

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 ¹³CO₂ 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.

Key words

protein hydrolysate - exogenous carbohydrate oxidation - multiple transportable carbohydrates - endurance exercise - gastrointestinal comfort - cycling time trial

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