Results indicated that the patterns of activation in the submental muscle group while training on the expiratory device had longer duration of activation with higher amplitude of EMG activity when compared with the swallowing condition. These tasks allowed comparison of muscle activity during both the swallow and expiratory tasks completed with the trainer. Participants were asked to perform two swallows (saliva swallow and water swallow) and develop an expiratory pressure set at 25% and 75% of their maximum expiratory pressure (MEP) using an expiratory muscle strength trainer. Twenty participants (10 males, 10 females mean age = 29 years) were recruited to participate in a one-session study. These muscles are known to be important for normal swallow function. Support for this hypothesis was tested by examining the timing and amplitude of submental muscle activity obtained using surface EMG. Specifically, the use of the trainer may result in increased activation of the submental muscle complex. Recently, it has been speculated that expiratory strength training may alter the force generation of muscles used during the swallow process. The use of expiratory muscle strength trainers improves parameters related to pulmonary function, speech, and cough in both healthy and patient populations.
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