sentences:  Moreover, it has been argued that the 15-round distance greatly increased the risk of dehydration and exhaustion.However, "purists" of the sport have contended that the shift from 15 rounds to 12 rounds has impacted viewership of the sport.Moreover, Frank Lotierzo, a critic of the 12-round limit, pointed out that fatalities are rare in heavyweight matches, instead attributing deaths to dehydration from the pressure of "making weight" for lower weight classes