Biomedical subjects

Marjanna Artkoski

Publications and source records attributed to Marjanna Artkoski.

2 recordsLinked to original sources

PubMed2002

Changes in voice during a day in normal voices without vocal loading.

Various changes in vocal parameters have been observed during the working days of voice professionals, e.g. teachers. The present study investigated vocal parameters during daytime when voice was not used. Eleven females and ten males (mean ages 30 and 40 years) volunteered as subjects. They recorded the same reading task in the forenoon and in the afternoon with an interval of 6-8 hours. Between the recordings voice use was avoided. Six females repeated the test in six days with the intervals from one week to three months. Fundamental frequency (F0) and sound pressure level (SPL) were measured. Voice quality was studied by calculating the alpha ratio (SPL 1000-5000 Hz/SPL 50-1000 Hz). In most cases F0 was higher in the afternoon, although the change was on the average small (in most cases within 5 Hz) and statistically non-significant. Alpha ratio was significantly higher for the females and lower for the males in the afternoon. Similar changes have been reported after vocal loading. The results suggest that studies on the effects of vocal loading should also address changes in vocal parameters when no vocal loading is present. Gender difference in the vocal changes warrants further study.

Adult↗

PubMedDate not supplied

Changes in voice and subjective sensations during a 45-min vocal loading test in female subjects with vocal training.

Twenty-four females (mean age 38 years) with varying amounts of vocal training read aloud from a book for 45 min (70 dB at 40 cm distance). Symptoms of the throat and voice were ascertained with a questionnaire before, during and after the test. Fundamental frequency (F(0)) and sound pressure level (SPL) were measured. The alpha ratio describing the spectrum slope was calculated: SPL in the range 1-5 kHz minus SPL in the range 50 Hz-1 kHz. All measurements were made for the 1st, 5th, 15th, 30th and the 45th min of loading and for text reading before and after it. F(0), SPL and alpha values rose during the test, which may indicate adaptation to loading. During the first 5 min, however, these parameters showed a decreasing tendency, possibly reflecting warm-up. Subjects with more vocal training had a lower F(0) in the loading test. SPL seemed to reflect variation of symptoms during loading. Changes in acoustic parameters did not distinguish between subjects with most and fewest symptoms of fatigue in this test.

Adult↗