blood doping       
noun [ U ]  sports specialized uk/ˈblʌd ˌdəʊ.pɪŋ/ us/ˈblʌd ˌdoʊ.pɪŋ/
 违规输血,血液兴奋剂
a way of cheating in sports by putting blood with extra oxygen into the body before a race or competition 
  Blood doping became less popular as new performance-enhancing drugs became available in the 1980s.
 Several coaches have been impacted by blood doping scandals.
 - More examples
 - He tested positive for blood doping.
 - Five of the top international marathons took a strong stance against blood doping.
 - The attorney has handled blood doping cases with several athletes.