The purpose of the current study was to compare selected acoustic and electroglottographic measures (closed quotient, pitch, and loudness) among vowel phonation, traditional voiced lip trill (VLTT), modified voiced lip trill methods (VLTM). A total of 21 participants without voice complaints produced 4-second long samples using each phonation method. Results indicated that mean closed quotient of VLTM was higher than that of vowel phonation and VLTT, while its range and standard deviation measures were higher than those of vowel phonation. Mean, range, standard deviation, maximum of pitch measures of VLTM were higher than those of vowel phonation. Lastly, mean and maximum loudness of the VLTM were higher than VLTT. In conclusion, the current data indicate the possibility to use the VLTM as a training method for singing or a strategy to facilitate generalization effect of voice therapy. Current results also reflect the necessity for further study pertaining to the long-term effect of the VLTM training method. Clinical implications are discussed.ope
