A Missouri mom accused of recording herself choking her infant son said doing so gave her an “adrenaline rush,” according to police. Emma Rigdon, 20, has been charged with two counts of child abuse, according to jail records. It’s unclear if she entered a plea to the charges. Her attorney, Charles Barberio, did not immediately respond to Headlines & Global News’ request for comment. Rigdon was staying at a shelter in St. Louis, Missouri, when she allegedly filmed herself physically assaulting her 6-month-old boy, KFVS-TV, KTVI-TV, and the River Front Times reported, citing the probable cause s…