No Effect of Protein Coingestion on Exogenous Glucose Oxidation during Exercise

Rowlands, David S.; Wadsworth, Daniel

doi:10.1249/mss.0b013e318237e7c5

Cited by 6 publications

(11 citation statements)

References 35 publications

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“…hydrolysate. Our finding of no change to the rate of exogenous carbohydrate oxidation with the co-ingestion of either a whey or casein hydrolysate agrees with the previous finding when a whole milk protein concentrate is co-ingested with carbohydrate [37]. However, co-ingestion of the single amino acid arginine increases the rate of exogenous carbohydrate oxidation supposedly via an increase in nitric oxide and intestinal vasodilation [34].…”

supporting

confidence: 90%

“…The PL trial served mainly to provide correction for background enrichment and comparison of outcome variables with the PL trial is only done when it aids in supporting identified changes between the 3 energy drink trials. To allow comparison with a large proportion of the recently published studies in this field, data were analysed using probabilistic magnitude-based inferential analysis, which has been recommended as the way forward [1,12] and has been described previously [2,28,29,[33][34][35][36][37]44] for analysing the physiological magnitude of effect. Inferential analysis was performed using published spreadsheets [9,11].…”

Section: Discussionmentioning

confidence: 99%

“…during exercise [37]. The limitation of using a whole milk protein concentrate is that it contains fats and that together with the complete polypeptide chains in a whole protein concentrate would be expected to slow gastric emptying and digestion, particularly due to the intact casein protein component [18,23].…”

Section: Abstract ▼mentioning

confidence: 99%

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

2015

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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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supporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

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

2015

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“…One plausible explanation for this discrepancy between conditions may be the influence of solution osmolality. Unfortunately we were unable to verify solution osmolality in the current study, however others have reported variations in gastric emptying rates resulting from the consumption of different forms of intact proteins [25,26]. Subsequently, exogenous CHO oxidation may have been reduced as a consequence of the delayed absorption of co-ingested CHO within the CHO-PRO condition [26,27], in which greater reliance would have been placed upon endogenous CHO reserves.…”

Section: Discussionmentioning

confidence: 78%

“…Unfortunately we were unable to verify solution osmolality in the current study, however others have reported variations in gastric emptying rates resulting from the consumption of different forms of intact proteins [25,26]. Subsequently, exogenous CHO oxidation may have been reduced as a consequence of the delayed absorption of co-ingested CHO within the CHO-PRO condition [26,27], in which greater reliance would have been placed upon endogenous CHO reserves. In contrast, it is also possible that the inclusion of peptides within the CHO-PRO-PEP condition may have enhanced gastric emptying and gastrointestinal uptake of CHO via the up-regulation of additional intestinal co-transporters [17,28-30].…”

Section: Discussionmentioning

confidence: 78%

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

Siegler

Page

Turner

et al. 2013

Journal of the International Society of Sports Nutrition

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BackgroundThe 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.MethodsIn 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 conclusionsDuring 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.

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Carbohydrate supplementation: a critical review of recent innovations

Baur

Saunders

2020

Eur J Appl Physiol

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No Effect of Protein Coingestion on Exogenous Glucose Oxidation during Exercise

Cited by 6 publications

References 35 publications

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

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

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

Carbohydrate supplementation: a critical review of recent innovations

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