 This study found that children with mouth breathing syndrome experienced reduced respiratory rates and increased inspiratory times when they breathed against inspiratory loads via nasal airways. Additionally, the use of inspiratory loads resulted in increases in tidal volume and end inspiratory volume for both devices. The flow resistance device was more effective than the pressure threshold device at generating volume, making it preferable for treating children with mouth breathing syndrome. This article was authored by Jessica Danielle Medeiros de Afonseca, Andrea Aliverti, Kaja Benicio, and others.