Related Experiment Videos
Respiratory and laryngeal contributions to maximum phonation duration
N P Solomon1, S J Garlitz, R L Milbrath
1Department of Communication Disorders, University of Minnesota, Minneapolis 55455, USA. solom006@tc.umn.edu
Journal of Voice : Official Journal of the Voice Foundation
|October 6, 2000
Summary
Maximum phonation duration (MPD) assessment may not fully reflect respiratory function. Laryngeal airway resistance correlated with MPD in men, but not women, questioning MPD's clinical utility for speech breathing.
Area of Science:
- Speech-Language Pathology
- Voice Science
- Respiratory Physiology
Background:
- Maximum phonation duration (MPD) is a standard speech-language pathology assessment.
- The specific respiratory and phonatory contributions to MPD are not typically evaluated.
- Understanding these components is crucial for comprehensive voice assessment.
Purpose of the Study:
- To investigate the relationship between lung volume, vital capacity (VC), and MPD.
- To examine laryngeal airway resistance (Rlaw) during a modified MPD task.
- To assess the clinical utility of MPD in evaluating speech breathing mechanisms.
Main Methods:
- Six men and six women with normal speech and voice participated.
- Lung volume was monitored during a standard MPD task.
- Laryngeal airway resistance (Rlaw) was measured during a modified, slow syllable-repetition MPD task.
Main Results:
- Subjects utilized approximately 90% of vital capacity (VC) for optimal MPD.
- No consistent relationship was found between MPD and VC across all subjects.
- Rlaw strongly correlated with MPD in men, but not in women.
- A subset of trials (32%) showed Rlaw increasing as lung volume decreased, a pattern observed in four subjects.
Conclusions:
- The clinical utility of MPD for assessing speech breathing is questionable due to inconsistent associations with VC.
- Atypical laryngeal valving strategies may influence MPD results.
- Further research is needed to clarify the respiratory and laryngeal contributions to MPD.