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  • Title: Voice changes during work: subjective complaints and objective measurements for female primary and secondary schoolteachers.
    Author: Rantala L, Vilkman E, Bloigu R.
    Journal: J Voice; 2002 Sep; 16(3):344-55. PubMed ID: 12395987.
    Abstract:
    The purpose of this investigation was to study voice changes during a working day. The subjects consisted of 33 female primary and secondary schoolteachers who recorded their first and last lessons during one school day. The subjects were studied both as one group and two subgroups (those with many and those with few voice complaints). Estimates of fundamental frequency (F0), sound pressure level (SPL), the standard deviations of these values (F0 SD; SPL SD) and F0 time (vibration time of vocal folds) were made. The most obvious change due to loading was the rise of F0 that was 9.7 Hz between the first and last lesson (P = 0.00). F0 increased more (12.8. Hz, P = 0.006) in the subgroup with few complaints.
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