Systematic training in master swimmer athletes increases serum insulin growth factor-1 and decreases myostatin and irisin levels. - Curiel-Cervantes, V.; Solis-Sainz, J. C.; Camacho-Barrón, M.; Aguilar-Galarza, A.; Valencia, M. E.; Anaya-Loyola, M. A. (Growth Factors, 2022)