Carnitine in muscle, serum and urine of non-professional athletes; effects of physical exercise, training, and L-carnitine administration. - Arenas,J.; Ricoy,J.R.; Encinas,A.R.; Pola,P.; D’Iddio,S.; Zeviani,M.; Di Donato,S.; Corsi,M. (Muscle & Nerve, 1991)