EFFECT OF STRENGTH TRAINING SESSION ON BLOOD LEUCINE CONCENTRATION FOLLOWING ORAL INGESTION OF LEUCINE OR BCAAS IN MEN

The amino acid absorption rate from different protein sources ranges from 1.3 to 10.0 g/h (1). It has been shown earlier (2,3) that after ingestion of 3.9-4.0 g single amino acid arginine or taurine the peak concentration in plasma occurs at 60 min. The one hour strength training session (STS) is shown to delay the peak concentration of arginine and taurine (3). The purpose of the present study was to investigate the acute effects of STS on leucine concentra-tion in blood after orally ingested capsules of either single leucine or a combination of branched chain amino acids (BCAAs: leucine, isoleucine and valine). Subjects were nine physically active men (24±3 yrs; 1.78±0.06 m; 76±7 kg) who participated in a double blind, randomized, and cross-over experiment. They fasted for 10 hours before the 120 min measurement period at 8:00