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tracking_endurance_of_voice-healthy_individuals_in_a_vocal_loading_test_including_long_time_voice_measurement [2014/04/01 20:31] (current)
bziolko created
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 +Susanna Whitling 1, Viveka Lyberg Åhlander 1, Roland Rydell 2 (Sweden)
 +**Tracking endurance of voice-healthy individuals in a vocal loading test including long time voice measurement**
 +1) Lund University\\
 +2) Skåne University Hospital\\
 +Eleven voice healthy individuals (6F/5M) took part in a vocal loading test. The aim of the study was to develop a vocal loading test to be used in a clinical setting. The subjects read a text in ambient babble. The babble was aired at increasing SPL (55 dB SPL-85 dB SPL) through a loudspeaker. The subjects were told to stop reading when or if the felt any discomfort from the throat. To track any vocal or physiological changes associated with voice production the test was preceded and followed by voice recordings, high speed films of the vocal folds and measurements of phonation threshold pressure (PTP). The entire process, including pre and post recordings, was tracked using a voice accumulator (VoxLog) and a structured voice activity journal.
 +The subjects spent very different amounts of time performing the test: one male subject read for just under three minutes, while two subjects (F and M) read for 30 minutes. Reasons for withdrawing from the vocal loading test, along with notes on vocal loading strategies were recorded. Four days of voice use were registered with VoxLog for each subject, with the vocal loading test taking place day two. The vocal effort during the vocal loading test was not matched in the everyday life of the subjects regarding time spent phonating, F0 and voice intensity level, except briefly if singing.
 +The voice recordings showed all the subjects phonating at a higher voice intensity level promptly after the vocal loading test than they had done before the test. Nine subjects either maintained or raised their F0 level, while two female subjects lowered their F0 level. The speech range profiles changed for all the subjects, most of them increasing the intensity and frequency areas after vocal loading. The LTAS shows most of the subjects' voices to be more hypofunctional after loading. The PTP increased in six of the subjects and decreased in four. No clear parallel was shown between PTP changes and the subjects' previous voice training.
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