Originally posted by Vinnykin
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The effect of exercise
In the past years, different groups have tested selected athletes' samples to determine whether exercise played a role in the excretion of norsteroid metabolites and apparently, it is not the case. One group analysed samples taken from two cohorts of football players, amateurs and professionals, and noted that up to 6% of the samples collected post‐match—in uncontrolled conditions—contained traces of 19‐NA; the authors prudently attributed the findings to either endogenous production, release from the fatty tissues of a previous intake of 19‐NT, or intake just prior to the match of a product containing nandrolone.71 Another group reported the results of 385 samples from 40 football players and described concentrations of 19‐NA as significantly higher than those before match,72 while again in uncontrolled conditions, traces of 19‐NA were found in some professional football players' samples but were absent in samples from the control group.73
Under controlled conditions, baseline levels of 19‐NA in male athletes have been found to be either undetectable or reaching a maximum level of 0.25 ng/ml (mean 0.048 ng/ml). Exercise was not found to influence 19‐NT secretion or excretion of 19‐NA.74 There was no impact on the excretion of norsteroid metabolites of controlled exercise sessions in young male athletes; only one sample contained measurable amount of 19‐NA (0.13 ng/ml).75,76
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2657496/
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