In a study of 240 persons, 121 males and 119 females, aged on 6 to 18, the author demonstrated the relation between phonation time and phonic breath volume in Koreans.
The test is performed in the following manner. After a few trials, the person takes a deep breath and phonates vowels, as A,E,I,O and U on a desired pitches e’(330 cps) and a’(440 cps) each for along as possible but tone could be phonated musically useful sostenuto.
The vital capacity volume was measured. with Hutchinson´s spirometer, and measured the phonation time in seconds with stop watch during which a particular tone can be phonated on one exhalation; and also phonic breath volume were calculated.
The author has obtained the following results;
1) The vital capacity volume shows 2, 692 cc in male, 2,158 cc in female 2,425 cc in average, and their sex difference is 534 cc.
2) The phonation´ time in average is 16.05 seconds, and it is. longer at e’(330 cps) than at a’(440 cps) level, and also longer on U,O,I,E, and A utterances in the order.
3) The phonic breath volume in average is 151.1 cc.
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