The Long-Acting Phosphodiesterase Inhibitor Tadalafil does not Influence Athletes' V·O2max, Aerobic, and Anaerobic Thresholds in Normoxia - Di Luigi, L; Baldari, C; Pigozzi, F; Emerenziani, G P; Gallotta, M C; Iellamo, F; Ciminelli, E; Sgrò, P; Romanelli, F; Lenzi, A; Guidetti, L (International Journal of Sports Medicine, 2008)