Influence of paroxetine, branched-chain amino acids and tyrosine on neuroendocrine system responses and fatigue in humans.

Effects of a serotonin re-uptake inhibitor and oral amino acid supplementations on physical and mental performance as well as neuroendocrine variables were investigated. 10 male subjects cycled in four trials until exhaustion. Participants ingested a placebo in trial (T) I, 20 mg paroxetine in T II, 21 g branched-chain amino acids (BCAA) in T III and 20g tyrosine (TYR) in T IV.

Blood sampling in doping control. First experiences from regular testing in athletics.

We report the results from blood sampling taken for the first time during doping control in athletics. The study includes samples from 99 athletes tested during IAAF-meetings in 1993-94. Blood doping with allogenic blood was not detected.

Stereospecific Derivatization of Amphetamines, Phenol Alkylamines, and Hydroxyamines and Quantification of the Enantiomers by Capillary GC/MS.

The enantiomers of amphetamines, phenol alkylamines, and hydroxyamines are separated by using α-methoxy-α-(trifluoromethyl)phenylacetyl chloride as the chiral derivatizing agent for amino groups. Prior to N-acylation, amine salts are converted into the free bases and hydroxyl groups into O-silyl ethers by reaction with N-methyl-N-silylamides. N-Methyl-N-(trimethylsilyl)trifluoroacetamide, N-methyl-N-(triethylsilyl)trifluoroacetamide, or N-methyl-N-(tert-butyldimethylsilyl)trifluoroacetamide was used to protect the hydroxyl groups by TMS, TES, or the tBDMS groups.

Urinary testosterone (T) to epitestosterone (E) ratios by GC/MS. I. Initial comparison of uncorrected T/E in six international laboratories.

Six laboratories in six countries collaborated to investigate the analytical method for estimating the testosterone to epitestosterone ratio (T/E) in urine by gas chromatography/mass spectrometry in the context of detecting the application of T as a doping agent in sport. The protocol specified many but not all details of reagents and instrument conditions. The design included the distribution and analysis of four urines with different T/E values, three replicates per value, and one standard.