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Objective: Electroglottography (EGG) is an instrumental measurement technique that provides a relative measure of the contact area between vocal folds. It is important to examine whether this measurement provides reliable data in Turkish. The aim of this study is to determine the level of reliability of EGG measurements made at different times related to some sustained vowel vocalizations. Methods: Seventy participants, 35 women and 35 men, aged between 18-25 and who have healthy voice, participated in the study. The Kay-PENTAX Electroglottograph model 6130 was used to study participants' production of/i/,/u/,/ɛ/and/ʌ/vowels. Data were collected from participants at four different time points: (1M) first week in the morning, (1E) first week in the evening, (2M) second week in the morning, and (2E) second week in the evening. The data obtained from all these measurements were matched in terms of time points; 1M-1E, 2M-2E, 1M-2E and 1E-2E. The consistency between measurements of these time points was studied by the inter-class correlation coefficient (ICC), a two-way mixed model. The gender differences of the parameters were analyzed with independent samples t-test. Results: According to repeated test results of all parameters obtained for the/ɛ/vowel for both sexes and the/i/vowel for men only, ICC values were statistically significant at levels ranging from moderate to excellent. In addition, when closed and open phase data were examined, values of all vowels did not differ according to gender during phonations. The frequency periodicity parameter of/ʌ/,/ɛ/and/i/vowels differs statistically significant in this respect. When the averages were examined, it was found that the measurements of women were higher than those of men in all parameters where significant differences were found. Conclusion: As a result of repeated measurements with EGG, regardless of the recording time, measurements of the/ɛ/vowel showed more reliable results compared to other vowels. [ABSTRACT FROM AUTHOR]

The present study tested whether there is cross-interference between electromagnetic articulography (EMA) and electroglottography (EGG) during the acquisition of kinematic speech data. In experiments 1A and 1B, EMA sensors were calibrated with and without EGG electrodes present in the EMA field. In experiment 2, EMA was used to record lip, tongue, and jaw movements for one male speaker and one female speaker, with and without simultaneous EGG recording. Collectively, the results provide no evidence of signal artifacts in either direction, suggesting that EMA and EGG technology can be combined to reliably assess laryngeal and supralaryngeal motor coordination in speech.

Background: Laryngeal toxicity (LT) following concurrent chemo-radiotherapy (CCRT) for non-laryngeal head & neck cancers(NLHNC) has been inadequately studied. Electroglottography (EGG), a non-invasive technique for objective quantification of LT, measures the change in electrical impedance generated by glottic closure., Aim: Objective and subjective assessment of acute LT post-CCRT in NLHNC., Materials and Methods: A prospective study on 30 NLHNC patients, treated with CCRT; 66-70Gy/33- 35fractions with weekly Cisplatin. Flexible laryngoscopic examination and EGG were performed at baseline, 6weeks, and 3months post-CCRT; Grades of LT and contact quotients(CQ) were documented. Patientreported outcomes of voice-related quality of life(QoL) performed at the same intervals, using a 30-item Voice Symptom Scale (VoiSS) questionnaire., Statistical Analysis: Results of continuous measurements were studied by mean +/- standard deviation. Analysis of variance (ANOVA) was used for comparison of pretreatment and post-treatment results in more than two groups. Significance was assessed at 5% level ofsignificance. Post- hoc analysis has been done using Tukey-Krammer method for multiple comparisons. Correlation analysis was performed using Pearson correlation test., Results: 26/30 patients completed CCRT; 14 were available at 6weeks; 10 at 3months post-CCRT for analysis. At 6 weeks, 3/14(21.5%) patients had Grade II LT; 11/14(78.57%) had grade III. At 3months, 2/10(20%) had Grade I, 6/10(60%) had grade II but 2/10(20%) had worsened to grade IV. Mean CQ at baseline was 50.77 +/- 5.55; which decreased at 6 weeks to 48.56 +/- 4.66 and further at 3months to 45.56 +/- 4.66 (>0.05) suggestive of glottic hypo-adduction. VoiSS responses showed a significant impact on QoL in all three domains at six weeks and three months post-CCRT, compared to baseline (P < 0.0001)., Conclusion: Electroglottography is a potential tool to quantify acute LT post CCRT. Patient-reported outcomes may not correlate to the objective measures of laryngeal toxicity and require separate recording and reporting. A larger sample size would be required to draw further significant correlations. Key Words: Electroglottography; laryngeal toxicity; head neck cancer; voice; chemo-radiotherapy.