It depends on your stack size. If you are a big stack, you should take advantage of other peoples risk aversion near the bubble by playing a loose and aggressive style forcing them to often make decisions for all their chips. When the bubble burst, some of that risk aversion will go away, and therefore you need to go back to a more normal playing style. You can call a bit wider though, because small stacks will be showing wider no longer being afraid to bust next. If you are a small or medium stack on the other hand, its kind of the other way around. Near the bubble you had to hold back especially against big stacks, but when the bubble has burst, you can loosen up, because its no longer important to outlast a few more players.