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- Title
Intrinsic Laryngeal Muscle Response to a Public Speech Preparation Stressor.
- Authors
Helou, Leah B.; Rosen, Clark A.; Wei Wang; Verdolini Abbott, Katherine
- Abstract
Purpose: Research suggests that abnormal levels of intrinsic laryngeal muscle (ILM) contraction is a potential causal factor in stress-induced voice disorders. This study seeks to characterize the ILM stress response in a cohort of vocally healthy women. Method: The authors used an unblinded, nonrandomized, repeated-measures design. Forty vocally healthy female adults were subjected to a stressful speech preparation task. Measurements of heart rate, blood pressure, trapezius muscle (positive control) activation, and tibialis muscle (negative control) activation were obtained from 37 participants before and during stressor exposure, in a nonvoice and nonspeaking task paradigm, to confirm physiological stress response compared to baseline. Fine wire electromyography of the ILMs (posterior cricoarytenoid, thyroarytenoid/lateral cricoarytenoid muscle complex, and cricothyroid) was performed simultaneously so that the activity of these muscles could be measured prior to and during stressor exposure. Results: The protocol successfully elicited the typical and expected physiological stress responses. Findings supported the hypothesis that, in some individuals, the ILMs significantly increase in activity during stress reactions compared to baseline, as do the control muscles. Conclusions: This study characterizes ILM responses to psychological stress in vocally healthy participants. Some of the female adults in this study appeared to be "laryngeal stress responders," as evidenced by increased activity of the ILMs during a silent (i.e., nonvocal, nonspeech) speech preparation task that they considered to be stressful.
- Subjects
PENNSYLVANIA; LARYNGEAL muscles; DISEASES; PSYCHOLOGICAL stress; MUSCLE contraction; VOICE disorders; PHYSIOLOGY of women; PUBLIC speaking; PHYSIOLOGICAL aspects of speech; PHYSIOLOGY; DISEASE risk factors; PHYSIOLOGICAL stress; ANALYSIS of variance; CHI-squared test; ELECTROMYOGRAPHY; HEART beat; LONGITUDINAL method; PROBABILITY theory; RESEARCH funding; STATISTICS; T-test (Statistics); TRAPEZIUS muscle; VIDEO recording; DATA analysis; EFFECT sizes (Statistics); REPEATED measures design; DATA analysis software; DESCRIPTIVE statistics
- Publication
Journal of Speech, Language & Hearing Research, 2018, Vol 61, Issue 7, p1525
- ISSN
1092-4388
- Publication type
Article
- DOI
10.1044/2018_JSLHR-S-17-0153