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These subjects then performed a WRT (phonation in a silicone tube of 30 cm length, 5 cm underneath the liquid area) for 10 min. Repeated measurements of sustained phonation were performed 0, 10, and 30 min after working out. From the HSV data the glottal area waveform (GAW) was segmented and GAW parameters had been calculated. RESULTS During WRT there is a growth of this GAW related open quotient and shutting quotient. Immediately after WRT, there clearly was a drop of both va