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ABS TRACT Objective: This study aimed to measure changes in vocal folds color throughout two solo performance tasks. Material and Methods: For this purpose, 30 healthy trained classical singers aged between 27 and 35 years (15 males and 15 females) were the subjects of the study. Two types of vocal loading task were employed: (1) 20 minutes of singing and (2) 60 minutes of singing. In the first type the investigations were performed twice: before singing and 15 minutes later. In the second type the investigations were made three times: in the morning before singing, after 15 minutes of vocal rest and after12 hours of vocal rest. The investigation included laryngoscopy, laryngostroboscopy and acoustic test. Results: It was revealed that after the first type of vocal loading hyperemia of the vocal folds did not appear in any of singers. This appeared in 15 minutes of vocal rest after the second type of loading and was prolonged not less than 12 hours in 25 singers. Laryngostroboscopy and acoustic test did not reveal pathology in these participants. Five subjects had no color changes in second type of vocal loading. Conclusion: Hyperemia of the vocal folds was revealed in 83.3% of participants after 60 minutes of singing and prolonged not less than 12 hours. Hyperemia accomplished neither vocal discomfort nor objective deteriorations of vocal quality and could be estimated as physiologic laryngeal condition. In the remaining 16.7% of performers hyperemia was not revealed. This could be regarded as more high level of their individual vocal endurance, or as individual peculiarity of their larynx.

Physiologic Laryngeal Changes in Operatic Singers After Different Vocal Loading Тasks