The long-acting phosphodiesterase inhibitor tadalafil does not influence athletes' VO2max, aerobic, and anaerobic thresholds in normoxia. - Di Luigi L; Baldari C; Pigozzi F; Emerenziani GP; Gallotta MC; Iellamo F; Ciminelli E; Sgrò P; Romanelli F; Lenzi A; Guidetti L (International Journal of Sports Medicine, 2008)