High intensity exercise is characterized by, "brief, intermittent bouts of vigorous exercise interspersed by periods of rest or low intensity activity." If the limiting factor of this activity is slow ATP synthesis, supplementing may show some improvement.
There are fundamental problems with supplementing creatine in order to improve aerobic performance. While creatine definitely helps improve anaerobic performance, there is much less evidence to suggest it does the same in an aerobic environment.
Creatine is one of the most popular supplements available on the market with sales estimated at $400 million annually. This popularity comes for a good reason; creatine is one of the few supplements that consistently demonstrates its effectiveness in a high number of research articles.