DXM is also used recreationally. When exceeding label-specified maximum dosages, dextromethorphan acts as a dissociative anesthetic. Its mechanism of action is via multiple effects, including actions as a nonselective serotonin reuptake inhibitor and a sigma-1 receptor agonist.
Aroldis Chapman has thrown the fastest pitch ever recorded, but he has challengers for baseball's hottest heater in 2017. Ever since Aroldis Chapman delivered a 105 mph fastball to Tony Gwynn Jr., Chapman's name has been synonymous with velocity.
In 2008, the average major-league fastball registered 90.9 mph. Last season, the average fastball reached 92.0 mph. In 2003, Houston reliever Billy Wagner was the only pitcher to throw at least 25 pitches at 100 mph or faster, according to Baseball Info Solutions. In 2013, eight pitchers hit triple digits.