Source: Annual Congress 2012 - Various issues in clinical physiology
Disease area: Airway diseases

Abstract

Introduction: Fatigue of the respiratory muscles has been associated with swallowing disorders in many respiratory and neurological diseases, however, the mechanism with which fatigue affects the swallowing function remains unclear.
Aims: The aim of the present pilot study was to examine the effects of respiratory muscle fatigue on swallowing physiology in healthy adults.
Method: Participants included 10 healthy young adults randomly assigned in two groups: an expiratory and an inspiratory muscle group. Respiratory and electrophysiological measurements were obtained during the following tasks: three a)5ml water swallows, b)100ml continuous water swallows and c)solid swallows (cracker), at three time points: at baseline, immediately post exercise-induced fatigue, and finally, after a 15-min rest period. A loaded breathing device was used to induce fatigue. Surface electromyography was employed to capture muscle activity of the submental and the infrahyoid muscles during swallowing.
Results: Electromyographical findings showed that, for the submental muscle group, the integral was found to be significantly higher during the immediate post- fatigue condition compared to both the baseline and post- rest conditions (p<0.05) in all tasks for both the inspiratory and expiratory groups.
Conclusion: These preliminary results suggest that fatigue of the expiratory muscles has an effect on selective electrophysiological measures of swallowing. The greater impact of the submental muscles during swallowing compared to the infrahyoids could be a compensatory strategy, given the fatigue of the lower respiratory muscles.

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Citations should be made in the following way:
I. Malatra, C. E. Garber, G. Malandraki, J. H. Saxman (New York, United States Of America). The effects of respiratory muscle fatigue on swallowing physiology in healthy young adults: Preliminary results. Eur Respir J 2012; 40: Suppl. 56, 3788

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