Study probes increased 'oxygen-carrying' capacity in blood
                                
                                
                                    (Newser) -
                                    Researchers are investigating whether Viagra provides athletes with an unfair advantage at high altitudes, the New York Times reports. By dilating blood vessels, Viagra may increase an individual's oxygen-carrying capacity. The test subjects in the Marywood University study are lacrosse players, who laugh off classmates'  teasing that comes with taking...