The jumpers at LSU basically use the same warmup (albeit slightly shortened) as during training but the women sprinters use a "competition warmup." The sprinters "competition warmup" is sometimes used during practice but only for special occasions (i.e. time trials). In my opinion there are pluses and minuses for going either way. If you do the normal, everyday warmup, it's familiar which can be mentally relaxing. On the other hand, a special warmup might create more stress which could be either a good or bad thing depending upon the arousal level of the individual. Another point to consider is that during a training session, a long warmup (for example, one consisting of dynamic warmup, static and dynamic stretching, sprint drills, and hurdle mobility) could be used as a form of general conditioning. While this is perfectly acceptable for a training session, it would probably not be the best idea for a meet day.