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Abstract
Background: Egg protein is ingested during recovery from exercise to facilitate the post-exercise increase in muscle protein synthesis rates and, as such, to support the skeletal muscle adaptive response to exercise training. The impact of cooking egg protein on post-exercise muscle protein synthesis is unknown.Objectives: To compare the impact of ingesting unboiled (raw) versus boiled eggs during post-exercise recovery on postprandial myofibrillar protein synthesis rates.
Methods: In a parallel design, forty-five healthy, resistance trained young men (age: 24 (95%CI: 23-25) y) were randomly assigned to ingest 5 raw eggs (∼30 g protein), 5 boiled eggs (∼30 g protein), or a control breakfast (∼5 g protein) during recovery from a single session of whole-body resistance-type exercise. Primed continuous L-[ring-13C6]-phenylalanine infusions were applied, with frequent blood sampling. Muscle biopsies were collected immediately after cessation of resistance exercise and at 2 and 5 h into the post-exercise recovery period. Primary (myofibrillar protein synthesis rates) and secondary (plasma amino acid concentrations) outcomes were analyzed using repeated-measures (Time*Group) ANOVA
Results: Ingestion of eggs significantly increased plasma essential amino acid concentrations, with 20% higher peak concentrations following ingestion of boiled compared with raw eggs (Time*Group: P < 0.001). Myofibrillar protein synthesis rates were significantly increased during the post-exercise period when compared to basal, post-absorptive values in all groups (2-4 fold increase: P < 0.001). Postprandial myofibrillar protein synthesis rates were 20% higher after ingesting raw eggs (0.067%/h (95%CI:0.056-0.077); effect size (Cohen's d): 0.63), and 18% higher after ingesting boiled eggs (0.065%/h (95%CI:0.058-0.073); effect size: 0.69) when compared to the control breakfast (0.056%/h (95%CI:0.048-0.063), with no significant differences between groups (Time*Group: P = 0.077).
Conclusions: The ingestion of raw, as opposed to boiled, eggs attenuates the postprandial rise in circulating essential amino acid concentrations. However, post-exercise muscle protein synthesis rates do not differ after ingestion of 5 raw versus 5 boiled eggs in healthy young men. Trial registration: NL6506.
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Raw Eggs To Support Postexercise Recovery in Healthy Young Men: Did Rocky Get It Right or Wrong?
Egg protein is ingested during recovery from exercise to facilitate the postexercise increase in muscle protein synthesis rates and, as such, to support the skeletal muscle adaptive response to exercise training. The impact of cooking egg protein on postexercise ...
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