Biomedical subjects
Publications and source records attributed to P N Carding.
This study investigates the relationship between frequency and the open quotient (OQ) and speed quotient (SQ) values of combined glottography. Simultaneous electroglottography and photoglottography were performed on 20 healthy male subjects. Regression analysis showed that neither OQ nor SQ was dependent upon frequency. The technique is therefore still valid despite the inability to control this variable.
This study investigates the relationship between intensity and the open quotient (OQ) and speed quotient (SQ) values of combined glottography. Simultaneous electroglottography and photoglottography were performed on 20 healthy male subjects at intensities of 55 and 65 dB. Paired t-test statistical analysis showed that the open quotient varies inversely and the speed quotient directly with the intensity. When reporting findings it is therefore necessary to state the intensity at which the results were obtained.
This study investigates by combined glottography the effect of the anatomical changes of ageing on laryngeal movement during the vibratory cycle. 10 adult males less than 25 years of age were compared to 10 males over 60 years of age. The speed quotient was increased in the elderly group; thus, ageing in the larynx results in a slowing of the opening of the vocal folds. This may account for the different voice quality in the elderly. The clinician must consider the subject's age when interpreting speed quotient values.
It has recently been suggested that combined electroglottography and photoglottography may aid diagnosis and assessment of treatment of laryngeal pathology. The ability to record and analyse such traces was previously restricted to voice research laboratories. A simple, less expensive, system for use in the outpatient clinic is described. A preliminary study on 10 normal subjects produced results comparable to that of voice research laboratories. The clinical potential is discussed. This may represent a valued addition to the armamentarium of the clinician.