The suspensions for Yohan Blake, Lansford Spence, Marvin Anderson and Allodin Fothergill took effect immediately after Monday's sentencing hearing assembled by Jamaica's Sports Ministry.

The four had admitted to taking a banned stimulant before Jamaica's National Championships in June. A disciplinary panel had initially cleared them, but that ruling was appealed by the Jamaica Anti-Doping Commission.

The athletes and their attorneys were not willing to comment on the outcome.

Last month, defense attorney Lincoln Eatmon said his clients acknowledged guilt to avoid a "lengthy, expensive battle."