About: Transmission of droplet-conveyed infectious agents such as SARS-CoV-2 by speech and vocal exercises during speech therapy: preliminary experiment concerning airflow velocity

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About: Transmission of droplet-conveyed infectious agents such as SARS-CoV-2 by speech and vocal exercises during speech therapy: preliminary experiment concerning airflow velocity Goto Sponge NotDistinct Permalink

An Entity of Type : schema:ScholarlyArticle, within Data Space : covidontheweb.inria.fr associated with source document(s)

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type	Academic Article research paper schema:ScholarlyArticle
isDefinedBy	Covid-on-the-Web dataset
title	Transmission of droplet-conveyed infectious agents such as SARS-CoV-2 by speech and vocal exercises during speech therapy: preliminary experiment concerning airflow velocity
Creator	Bogdanski, Estelle Bouchet, Gilles Giovanni, Antoine Mattei, Alexia Michel, Justin »more»
source	Medline; PMC
abstract	PURPOSE: Infectious agents, such as SARS-CoV-2, can be carried by droplets expelled during breathing. The spatial dissemination of droplets varies according to their initial velocity. After a short literature review, our goal was to determine the velocity of the exhaled air during vocal exercises. METHODS: A propylene glycol cloud produced by 2 e-cigarettes’ users allowed visualization of the exhaled air emitted during vocal exercises. Airflow velocities were measured during the first 200 ms of a long exhalation, a sustained vowel /a/ and varied vocal exercises. For the long exhalation and the sustained vowel /a/, the decrease of airflow velocity was measured until 3 s. Results were compared with a Computational Fluid Dynamics (CFD) study using boundary conditions consistent with our experimental study. RESULTS: Regarding the production of vowels, higher velocities were found in loud and whispered voices than in normal voice. Voiced consonants like /ʒ/ or /v/ generated higher velocities than vowels. Some voiceless consonants, e.g., /t/ generated high velocities, but long exhalation had the highest velocities. Semi-occluded vocal tract exercises generated faster airflow velocities than loud speech, with a decreased velocity during voicing. The initial velocity quickly decreased as was shown during a long exhalation or a sustained vowel /a/. Velocities were consistent with the CFD data. CONCLUSION: Initial velocity of the exhaled air is a key factor influencing droplets trajectory. Our study revealed that vocal exercises produce a slower airflow than long exhalation. Speech therapy should, therefore, not be associated with an increased risk of contamination when implementing standard recommendations. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1007/s00405-020-06200-7) contains supplementary material, which is available to authorized users.
has issue date	2020-07-16(xsd:dateTime)
bibo:doi	10.1007/s00405-020-06200-7
bibo:pmid	32676677
has license	no-cc
sha1sum (hex)	9d617dd62327ab6174aa54b7e48dfc46fb808c9e
schema:url	https://doi.org/10.1007/s00405-020-06200-7
resource representing a document's title	Transmission of droplet-conveyed infectious agents such as SARS-CoV-2 by speech and vocal exercises during speech therapy: preliminary experiment concerning airflow velocity
has PubMed Central identifier	PMC7365602
has PubMed identifier	32676677
schema:publication	Eur Arch Otorhinolaryngol
resource representing a document's body	covid:9d617dd62327ab6174aa54b7e48dfc46fb808c9e#body_text
is schema:about of	named entity 'vowels' named entity 'Results' named entity 'compared' named entity 'high' named entity 'sustained' »more»

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