Exercise-induced effects on growth hormone levels are associated with ghrelin changes only in presence of prolonged exercise bouts in male athletes - Sartorio, A.; Morpurgo, P.; Cappiello, V.; Agosti, F.; Marazzi, N.; Giordani, C.; Rigamonti, A. E.; Muller, E. E.; Spada, A. (The Journal of Sports Medicine and Physical Fitness, 2008)