Birth Control Pills and Nonprofessional Voice: Acoustic Analyses PurposeTwo studies are presented here. Study 1 was aimed at evaluating whether the voice characteristics of women who use birth control pills that contain different progestins differ from the voice characteristics of a control group. Study 2 presents a meta-analysis that combined the results of Study 1 with those from ... Article/Report
Article/Report  |   October 2006
Birth Control Pills and Nonprofessional Voice: Acoustic Analyses
 
Author Notes
  • Contact author: Ofer Amir, Department of Communication Disorders, Sheba Medical Center, Tel Hashomer 52621, Israel. E-mail: oferamir@post.tau.ac.il
  • © 2006 American Speech-Language-Hearing Association
Article Information
Hearing & Speech Perception / Acoustics / Speech, Voice & Prosody / Speech
Article/Report   |   October 2006
Birth Control Pills and Nonprofessional Voice: Acoustic Analyses
Journal of Speech, Language, and Hearing Research, October 2006, Vol. 49, 1114-1126. doi:10.1044/1092-4388(2006/080)
History: Received March 9, 2005 , Revised September 15, 2005 , Accepted January 1, 2006
 
Journal of Speech, Language, and Hearing Research, October 2006, Vol. 49, 1114-1126. doi:10.1044/1092-4388(2006/080)
History: Received March 9, 2005; Revised September 15, 2005; Accepted January 1, 2006
Web of Science® Times Cited: 6

PurposeTwo studies are presented here. Study 1 was aimed at evaluating whether the voice characteristics of women who use birth control pills that contain different progestins differ from the voice characteristics of a control group. Study 2 presents a meta-analysis that combined the results of Study 1 with those from 3 recent studies that compared voices of women who use and do not use birth control pills.

MethodIn Study 1, voice samples from 30 women with no history of voice training, who use pills with different progestins (drospirenone, desogestrel, gestodene), and 10 women who do not use the pill were recorded at specific time points across the menstrual cycle and were analyzed acoustically. In Study 2, results from Study 1 were analyzed jointly with results from three recent studies, which used similar methodologies.

ResultsResults of Study 1 did not reveal acoustic differences in sustained phonation of vowels across the pill groups and controls. Results of the meta-analysis performed in Study 2 indicated that pill users exhibited lower jitter and shimmer values on sustained vowels, whereas no difference of fundamental frequency was observed among women who use the pill.

ConclusionsThese results support findings from previous studies, which suggested that no adverse effect on voice was detected among nonprofessional speakers who use new-generation monophasic birth control pills, for the measures studied. Furthermore, results of the meta-analysis suggested that some acoustic properties of the voice, which are reflected in perturbation measures in sustained vowels, may be improved among women who use the pill.

Acknowledgments
This study was funded, in part, by the Tel Aviv University Research Internal Fund. Tal Barer and Osnat Tzenker are acknowledged for their extensive part in the collection of the data for Study 1. Finally, the first author would like to thank Marlene Erez for her insightful comments during the preparation of this manuscript.
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