[Studies of voice stress in teachers with functional voice disorders caused by teaching activity].

30 female teachers of ten-years technical schools-15 with functional voice-disturbance an 15 with healthy voice-have been examined while teaching in respect of their strain. Duration of speech, intensity of their teachers voice an background noise, the frequency of heart rate and the arterial blood pressure were measured on the teaching day. Between both research groups no statistically significant differences were shown. There were no correlations between the durations of speech, intensity and vegetative parameters.