Creatine supplement sales exceeded 400 million dollars in 2004. Over 200 studies have shown that creatine supplementation enhances athletic performance. Despite its popularity and effectiveness, some fallacies still exist about this supplement. One of these is an unfounded concern about muscle cramps and dehydration.
Although, a number of published studies have refuted these claims directly, a position statement by the American College of Sports Medicine (ACSM) in 2001 advised individuals who are over weight and exercising intensely in hot environments, to avoid creatine supplementation.
However, recent reports now suggest the exact opposite. That is, creatine may enhance performance in hot and or humid conditions by maintaining hematocrit, aiding thermoregulation and reducing exercising heart rate and sweat rate. Creatine may also positively influence plasma volume during the onset of dehydration.
Creatine supplementation in the heat does not promote any additional risk to healthy people. The ACSM should get with the latest research and report the facts to the public.
Source: Br J Sports Med. Jan 2008