Serum levels of total and free IGF‐I and IGFBP‐3 are increased and maintained in long-term training. - Koziris,L.P.; Hickson,R.C.; Chatterton,R.T.; Groseth,R.T.; Christie,J.M.; Goldflies,D.G.; Unterman,T.G. (J Appl Physiol, 1999)