Studys Of Vocal Acoustics And Areo-dynamics On Patients With Abnormal Lung Function

ObjectiveTo investigate the acoustic and areo-dynamic features of voice in patients with abmormal lung function, evaluate the effect of lung disfunction on acoustics and areo-dynamics of voice,and observe the relationship between respiration and phonation. MethodsThe voice signals of sustained vowel /a/ were measured by a micro-computer with Dr.speech science for windows software and an aero-dynamic system in 50 patients with abmormal lung function,50 cases of pathological voices and 50 healthy adults. The acoustic parameters(FO,jitter,shimmer,intensity,NNE) and areo-dynamicparameters(mean airflow rate, MPT) were collected and analysed in lowest pitch,normal pitch and highest pitch.All patients were divided into two groups according to sex. ResultsIn the patients of abmormal lung function ,the parameters (shimmer, jitter, NNE, )were significantly increased or others(FO,MPT, intensity, mean air flow rate) were significantly decreased in lowest pitch. In normal pitch, MPT were decreased significantly , other parameters changed too but no statistic value. MPT and intensity were decreased significantly in highest pitch . There was a positive relationship between the degrees of lung disfunction and the parameters of acoustics and areo-dynamics. The parameters of mean air flow rate were decreased significantly compared with pathologic voices. ConclusionsAbmormal lung function affected significantly on acoustics and areo-dynamics of voice in three different pitches; The changes of the parameters were related to the degrees of lung function.The results showed that respiratory activities play an important role in phonation. The paramerters of acoustics and areo-dynamics may be of help to the dignosis , curative effect evaluation and prognosis estimation of lung function. In addition,the respiratory function may be helpful to the estimation of phonation capacity and vocal cord function as an objective signal.