Fit to Perform - The Influence on Jitter

Fit to Perform - The Influence on Jitter - JITTER-SING

Status

Active, not recruiting

Phases

Unknown

Study type

Observational

Source

DRKS

Registry ID

DRKS00039045

Enrollment

100

Registered

2026-02-04

Start date

2014-10-09

Completion date

Unknown

Last updated

2026-03-02

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

R49.0

Interventions

Group 1: - Cross-sectional observational study without intervention, single measurement per condition. - N = 93 vocal students (65 women, 28 men), predominantly at level 7 according to Bunch & Chapman

low background noise level. - Test subjects sang the vowels a, e, i, o, u at subjectively ‘soft’ and ‘loud’ at low, medium and high pitches relative to their respective voice type (bass, baritone, ten

Eligibility

Sex/Gender

All

Age

18 Years to No maximum

Inclusion criteria

Inclusion criteria: vocal students with healthy voices or professional singers

Exclusion criteria

Exclusion criteria: amateur singer Acute or known relevant voice disorder (clinically noticeable dysphonia). Illnesses or limitations that could impair participation in standardised voice recordings (screening using PAR-Q).

Design outcomes

Primary

Measure	Time frame
The primary endpoint is the reliability of jitter measurement (frequency perturbation) under different standardized recording conditions (sound pressure level, pitch, measurement interval, and vowel) in healthy singing students. Jitter is an established acoustic measure of voice quality and is included in composite indices such as the Dysphonia Severity Index, so reliable measurement protocols are clinically important for objective assessment and monitoring of voice disorders	—

Measure

Time frame

The primary endpoint is the reliability of jitter measurement (frequency perturbation) under different standardized recording conditions (sound pressure level, pitch, measurement interval, and vowel) in healthy singing students. Jitter is an established acoustic measure of voice quality and is included in composite indices such as the Dysphonia Severity Index, so reliable measurement protocols are clinically important for objective assessment and monitoring of voice disorders

—

Secondary

Measure	Time frame
Secondary endpoints are the absolute jitter values and their change as a function of sound pressure level, pitch, measurement interval, and vowel, in order to identify conditions under which jitter measurements are both low and stable. The aim is to derive clinically applicable recommendations for the standardization of acoustic voice diagnostics that improve the diagnostic usefulness of jitter in the assessment of vocal function, particularly in singers.	—

Measure

Time frame

Secondary endpoints are the absolute jitter values and their change as a function of sound pressure level, pitch, measurement interval, and vowel, in order to identify conditions under which jitter measurements are both low and stable. The aim is to derive clinically applicable recommendations for the standardization of acoustic voice diagnostics that improve the diagnostic usefulness of jitter in the assessment of vocal function, particularly in singers.

—

Countries

United Kingdom

Contacts

Public ContactPhilipp Mathmann

Universitätsklinikum Münster (UKM), Klinik für Phoniatrie und Pädaudiologie

Philipp.Mathmann@ukmuenster.de+49251 / 83 - 598 10

Outcome results

None listed

Source: DRKS (via WHO ICTRP) · Data processed: Mar 14, 2026