title: Phonation time, phonation volume and air flow rate in normal adults.
abstract: The purpose of this study was to determine the average phonation time, phonation volume and air flow rate, as well as the relationship between each of these parameters during two conditions (normal and deep breaths). Researchers expect to use these averages in screening of voice disorders. One hundred and three subjects, 67 males and 36 females, were studied. The instruments were a 9 liter respirometer, a tape recorder and a stop watch. The results indicated that the parameters for males were significantly greater than those for females. In addition, the findings suggested that the values of mean phonation time, phonation volume and air flow rate during deep breath were significantly greater than those during normal breath (p < 0.05). The phonation time was inversely related to the air flow rate. However, there was a positive relationship between phonation time and phonation volume, as well as between phonation volume and air flow rate. The findings supported our hypothesises.
authors.affiliation: Department of Otolaryngology, Khon Kaen University.
authors.forename: B
authors.initials: B
authors.lastname: Prathanee
authors.forename: J
authors.initials: J
authors.lastname: Watthanathon
authors.forename: P
authors.initials: P
authors.lastname: Ruangjirachuporn
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D010699:Phonation / Q000502:physiology; D012123:Pulmonary Ventilation; D013990:Tidal Volume