From the game manual:
In these games, the only options available are Playoff Normal, in which your team receives the enthusiasm effects of a regular Take It Easy but the effort level of a regular Normal, and Playoff Crunch Time, in which your team receives the enthusiasm effects of a regular Normal but the effort level of a regular Crunch Time.
Does this mean your enthusiasm will go up if you play Playoff Normal? And no change to enthusiasm, except for the normal rate of going back to 5 at Playoff Crunch Time?