Blood Substrates and Hormonal Responses to Increased Egg White Protein Intake Prior to a 12,000m Run in Heat

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This study was undertaken to investigate the effects of isoenergetic and increased amounts of egg white protein one hour before a run on the changes in the post-exercise blood biochemistry and the rating of the perceived exertion (RPE). Twenty-four male distance runners were divided into four groups. Venous blood samples were collected at three time points: just before the experiment (Pre), just after a 12,000m run (Post 0h) and one hour after the run (Post 1h). After the first blood sampling, each participant consumed one of the four isoenergetic supplements (86kcal); 0g, 5g, 10g, or 20g of egg white protein. The blood glucose, free amino acid, and branched chain amino acid (BCAA) levels in the 0g, 5g, and 10g protein groups were higher at Post 0h than at Pre. The pre-exercise intake of the 20g protein group showed the smallest changes in the blood biochemicals. The RPE scores were significantly higher at Post 0h, and did not vary among the four protein groups. Accordingly, the pre-exercise carbohydrate intakes significantly altered the post-exercise blood biochemisty findings, but the pre-exercise protein intake did not. Furthermore, the changes in the RPE scores in our present study were not explained by changes in the serum free tryptophan or the BCAA levels, and an increased dietary intake of egg white protein might not prevent post-exercise increases in the RPE scores.
日本ビタミン学会の論文