Custom-made mouthguards are used to prevent orofacial injuries arising from falls and knocks. It has been observed that thicker custom-made mouthguards transmit less force to the mouth owing to their higher energy absorption capacity. However, it is believed that thicker custom-made mouthguards can alter ventilation during exercise because of the higher resistance or restriction of oral airflow. The purpose of this study was to investigate if a thicker custom-made mouthguard occlusal thickness of 5-mm; 5MG alters ventilatory parameters, rate of perceived exertion RPE , and peak velocity during an incremental test relative to a thinner custom-made mouthguard occlusal thickness of 3-mm; 3MG and no mouthguard NoMG.
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