Akustinen äänenlaatuindeksi kuormittumisen ja palautumisen mittarina

This study examined how AVQI responds to vocal loading and following recovery. The effectsof recovery were also compared between two active recovery exercise groups (water resistancetherapy and nasal exercise) and one control group (silent rest). Each of the 30 participantsfirst read a random passage of text loudly (15 min.) as a vocal loading task. Thereafter theparticipants were divided into three groups according to the three recovery methods. Thefinal phase of the study consisted of 10 minutes of passive rest for each group. Recordingswere made before and after loading, active recovery, and passive recovery. AVQI and SoundPressure Level (SPL) were analyzed from the recordings. Vocal straining significantly increasedperturbation (shimmer) and SPL. After the straining, the change in spectral Tilt correlatednegatively with subjective straining sensations. After recovery, shimmer decreased andharmonics-to-noise ratio and Tilt increased. The three recovery groups differed significantlyfrom each other in regard to how SPL changed during the recovery periods (RM-ANOVA,(F(2, 25), p = 0,038). SPL increased in water resistance group and decreased in the othergroups. The increase in water resistance group may reflect higher subglottic pressure orlowered phonation threshold. Water bubbling in water resistance therapy may have massagelike effects on vocal fold tissue and increase blood flow, thus speeding up recovery