Australian Centre for Applied Research in Music Performance, University of Sydney, New South Wales, Australia.
J Voice. 2011 Sep;25(5):e233-43. doi: 10.1016/j.jvoice.2010.06.004. Epub 2011 Feb 25.
Assessment of the voice-change progress of 20 girls (12-13 years) over 1 year by observing changes in speaking fundamental frequency (SFo), voice range, and register pitch breaks in the context of weight, height, voice training, and self-perception.
One-year longitudinal collective case study.
Twenty girls were recorded at the beginning and end of a year; nine girls were recorded another three times. SFo, vocal range, and characteristics were analyzed and interactions between these data assessed against weight and height to indicate pubertal development, and to test the hypothesis that changes in weight, height, SFo, and pitch breaks were related. Effects of training and the girls' self-perception of their voice use were also assessed.
Vocal characteristics changed as the girls passed through different weight ranges. During 47.5-52.4 kg (called band 2) and 52.4-57.5 kg (band 3), there was progressive contraction of vocal range and in some girls a slight rise in SFo between recording times 1 and 5. Both high- and low-pitch breaks were present in 45% of girls' voices. Girls in band 4 (<57.5 kg) had an increased vocal range, and pitch breaks in vocal-range areas that indicated the development of adult vocal registers. In this study, voice-trained girls were heavier, had higher SFo, used wider speech-range inflection, had a higher vocal range, and greater voice-use confidence; all girls lost confidence in their voice use over the year.
In this longitudinal study of twenty 13-year-old girls, voice changes in SFo, vocal range, and pitch-break frequency were synchronous with certain weight ranges. Girls with training registered higher maximum phonational frequency and were more confident in their voice use than girls without training.
通过观察 20 名 12-13 岁女孩在 1 年中说话基频（SFo）、音域和音域音高中断的变化，评估她们的声音变化进展，同时考虑体重、身高、嗓音训练和自我感知等因素。
为期 1 年的纵向病例系列研究。
20 名女孩在 1 年的开始和结束时进行了记录，其中 9 名女孩还进行了另外 3 次记录。对 SFo、音域和特征进行了分析，并根据体重和身高评估这些数据之间的相互作用，以表明青春期发育情况，并检验体重、身高、SFo 和音高中断变化相关的假设。还评估了训练和女孩对自己嗓音使用的自我感知的影响。
随着女孩经历不同的体重范围，嗓音特征发生了变化。在 47.5-52.4 千克（称为第 2 组）和 52.4-57.5 千克（第 3 组）期间，音域逐渐收缩，在一些女孩中 SFo 在第 1 次和第 5 次记录之间略有上升。高、低音中断在 45%的女孩的声音中都存在。体重在第 4 组（<57.5 千克）以下的女孩的音域增加，并且在音域区域中出现了成人嗓音音域的音高中断，表明成人嗓音音域的发展。在本研究中，受过嗓音训练的女孩体重较重，SFo 较高，使用的语音范围变化较大，音域较宽，嗓音使用信心更高；所有女孩在这一年中都对自己的嗓音使用失去了信心。
在这项对 20 名 13 岁女孩的纵向研究中，SFo、音域和音高中断频率的变化与特定的体重范围同步。接受过训练的女孩的最大发音频率更高，对自己的嗓音使用更有信心，而未接受过训练的女孩则信心较低。
