著者

角谷,雄哉

出版者

日本運動生理学会事務局

雑誌

日本運動生理学雑誌

巻号頁・発行日

vol.21, no.1, 2014-02-01

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The velocity of absorption of dietary amino acids varies according to the type of dietary protein. Recently, blends of whey and casein protein products have been commercially appeared sports nutrition fields. However, change of plasma amino acid concentration after ingestion of blend of whey and casein protein is unclear. We hypothesized that the ingestion of an equal blend of whey and casein protein would maintain long time the plasma amino acids concentration than that of only whey protein. To examine the digestion rate of blends of two proteins, we characterized time- dependent change of plasma amino acid concentration after ingestion of it. This study consisted of three trials by double blind cross over fashion. The subjects were eight healthy people. The subjects ingested one of the 20g proteins: a whey only, a casein only, or an equal blend of whey and casein, respectively. Plasma total amino acids (TAA) indicated a significant increase at 30 min after ingestion of protein and maintained up to 60 min. At 120 min after ingestion of protein, plasma TAA also indicated a significant decrease from 90 min, and returned to the base line at 240 min. There was no significant variability of plasma amino acid concentration by types of protein on plasma TAA. As an ingestion of protein blends, area under the curve of plasma urea in male was significant lower compared with the whey protein ingestion. These findings might indicate that ingestion of blend protein probably resulted in promote postprandial protein deposition by inhibition of protein breakdown.