How This Compares to the UFC's Approach
The UFC has not adopted hydration testing at the same scale, but it has made a separate structural change aimed at the same underlying problem. In 2015, the promotion banned intravenous rehydration for fighters under its anti-doping policy, closing off a common same-day weight-recovery method that had let fighters swing large amounts of body mass overnight. Around the same period, several UFC events moved to early Friday morning weigh-ins rather than the traditional Friday afternoon slot, giving fighters roughly six additional hours to rehydrate naturally before fight night. Neither change targets dehydration directly the way ONE's urine test does; both instead try to slow down how fast and how far a fighter's weight can swing between weigh-in and competition.
