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Impact of low filter resistances on subjective and physiological responses to filtering facepiece respirators.

Authors
Roberge-RJ; Kim-J-H; Powell-JB; Shaffer-RE; Ylitalo-CM; Sebastian-JM
Source
PLoS One 2013 Dec; 8(12):e84901
NIOSHTIC No.
20043613
Abstract
Ten subjects underwent treadmill exercise at 5.6 km/h over one hour while wearing each of three identical appearing, cup-shaped, prototype filtering facepiece respirators that differed only in their filter resistances (3 mm, 6 mm, and 9 mm H2O pressure drop). There were no statistically significant differences between filtering facepiece respirators with respect to impact on physiological parameters (i.e., heart rate, respiratory rate, oxygen saturation, transcutaneous carbon dioxide levels, tympanic membrane temperature), pulmonary function variables (i.e., tidal volume, respiratory rate, volume of carbon dioxide production, oxygen consumption, or ventilation), and subjective ratings (i.e., exertion, thermal comfort, inspiratory effort, expiratory effort and overall breathing comfort). The nominal filter resistances of the prototype filtering facepiece respirators correspond to airflow resistances ranging from 2.1 - 6.6 mm H2O/L/s which are less than, or minimally equivalent to, previously reported values for the normal threshold for detection of inspiratory breathing resistance (6 - 7.6 mm H2O/L/sec). Therefore, filtering facepiece respirators with filter resistances at, or below, this level may not impact the wearer differently physiologically or subjectively from those with filter resistances only slightly above this threshold at low-moderate work rates over one hour.
Keywords
Respirators; Face-masks; Physiological-response; Humans; Air-purifying-respirators; Filters; Heart-rate; Respiration; Oxygen-uptake; Pulmonary-function; Breathing; Air-filters; Air-flow; Airway-resistance
Contact
Raymond J. Roberge, Technology Research Branch, National Personal Protective Technology Laboratory, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Pittsburgh, PA, USA
CODEN
POLNCL
CAS No.
124-38-9
Publication Date
20131227
Document Type
Journal Article
Email Address
dtn0@cdc.gov
Fiscal Year
2014
NTIS Accession No.
NTIS Price
Issue of Publication
12
ISSN
1932-6203
NIOSH Division
NPPTL
Source Name
Public Library of Science One
State
PA; MN
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