Examples of computerised incentives used in spirometry Examples of computerised incentives used in spirometry. a) Blowing out candles incentive to encourage maximal peak expiratory flow. b) Bowling game to encourage expiration to forced vital capacity. Examples of computerised incentives used in spirometry. a) Blowing out candles incentive to encourage maximal peak expiratory flow. b) Bowling game to encourage expiration to forced vital capacity. Image reproduced with permission from CareFusion Corporation. Julie A. Duncan, and Paul Aurora Breathe 2014;10:34-47 ©2014 by European Respiratory Society