The effect of carbohydrate and marine peptide hydrolysate co-ingestion on endurance exercise metabolism and performance

Background: the purpose of this study was to examine the efficacy of introducing a fish protein hydrolysate (pep) concurrently with carbohydrate (cho) and whey protein (pro) on endurance exercise metabolism and performance.methods: in a randomised,double blind crossover design,12 male volunteers completed an initial familiarisation followed by three experimental trials. the trials consisted of a 90 min cycle task corresponding to 50% of predetermined maximum power output,followed by a 5 km time trial (tt). at 15 min intervals during the 90 min cycle task,participants consumed 180 ml of cho (67 g.hr-1 of maltodextrin),cho-pro (53.1 g.hr of cho,13.6 g.hr-1 of whey protein) or cho-pro-pep (53.1 g.hr-1 of cho,11 g.hr-1 of whey protein and 2.4 g.hr-1of hydrolyzed marine peptides).results and conclusions: during the 90 min cycle task,the respiratory exchange ratio (rer) in the cho-pro condition was significantly higher than cho (p < 0.001) and cho-pro-pep (p < 0.001). additionally,mean heart rate for the cho condition was significantly lower than that for cho-pro (p = 0.021). time-to-complete the 5 km tt was not significantly different between conditions (m ± sd: 456 ± 16,456 ± 18 and 455 ± 21 sec for cho,cho-pro and cho-pro-pep respectively,p = 0.98). although the addition of hydrolyzed marine peptides appeared to influence metabolism during endurance exercise in the current study,it did not provide an ergogenic benefit as assessed by 5 km tt performance. © 2013 siegler et al.; licensee biomed central ltd.