The "Aachen sings" study ("Aachen choir engagement study into GERD symptoms"): moderate singing and breathing exercises in a choir reduce reflux symptoms - a cohort study in non-specialist choristers.

BACKGROUND: The influence of singing activities and breathing exercises on the presence of gastroesophageal reflux disease (GERD) symptoms is not clear. While an Austrian study found symptom reduction, an Italian study showed more symptoms in professional opera choristers. These contradictory results may be due to differential intensity of the singing exercises. We therefore developed a questionnaire to investigate the presence of GERD typical symptoms and defined GERD in nonprofessional choristers with moderate singing activity and breathing exercises and compared the results to those from related non-singing control persons.

METHODS: 434 actively engaged lay-choir persons and 310 non-singing friends or relatives answered questions in a questionnaire regarding basic data, singing habits, GERD symptoms, and past or present diagnostic events and medications.

RESULTS: Non-singing control persons experienced more frequently heartburn (1.1 ± 4.1 vs. 0.5 ± 1.2 episodes/week, p = 0.001) and acid regurgitation (0.9 ± 4.1 vs. 0.5 ± 1.3 episodes/week, p < 0.001) and had more often already received the diagnosis of GERD (16.8 % vs. 10.4 %, p = 0.011). From the persons without known GERD, members of the control cohort more often fulfilled the simplified diagnostic criteria of GERD (14.3 % vs. 5.1 %, p < 0.001). A multivariate analysis identified non-singing, high body mass index, and smoking as significant risk factors for the presence of GERD symptoms.

CONCLUSION: The frequency of reflux symptoms and GERD is probably still increasing. Moderate singing activities and breathing exercises seem to be helpful in avoiding reflux symptoms such as heartburn and acid regurgitation.