title: Reusable elastomeric air-purifying respirators: physiologic impact on health care workers.
abstract: BACKGROUND
  Elastomeric air-purifying respirators offer the benefit of reusability, but their physiological impact on health care workers is unknown.
  
  
  METHODS
  Ten health care workers exercised at 2 health care-associated work rates wearing an elastomeric air-purifying respirator. Mixed inhalation/exhalation respirator dead space gases (oxygen, carbon dioxide) were sampled, and physiological parameters were monitored (heart rate, breathing rate, tidal volume, minute volume, oxygen saturation, transcutaneous carbon dioxide). Numerical rating scales were used to evaluate comfort and exertion.
  
  
  RESULTS
  Compared with controls (no respirator), significant decreases in the breathing rate at both work rates (P < .05) and increases in tidal volume at the lower work rate (P < .01) were noted with respirator use. Approximately half the subjects had transcutaneous carbon dioxide levels above the upper limit of normal after 1 hour of use. Although well tolerated, comfort was negatively impacted by elastomeric air-purifying respirators wear.
  
  
  CONCLUSIONS
  Reusable elastomeric air-purifying respirators impose little additional physiological burden over the course of 1 hour at usual health care work rates. However, the potential for carbon dioxide retention in a significant proportion of users exists and requires further investigation.
authors.affiliation: National Personal Protective Technology Laboratory, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Pittsburgh, PA 16236, USA. dtn0@cdc.gov
authors.forename: Raymond J
authors.initials: RJ
authors.lastname: Roberge
authors.forename: Aitor
authors.initials: A
authors.lastname: Coca
authors.forename: W Jon
authors.initials: WJ
authors.lastname: Williams
authors.forename: Jeffrey B
authors.initials: JB
authors.lastname: Powell
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Palmiero
mesh_terms: D016902:Air Pollution, Indoor; D001944:Breath Tests; D017743:Equipment Reuse; D005260:Female; D006282:Health Personnel; D006339:Heart Rate; D006801:Humans; D008297:Male; D008422:Materials Testing; D008991:Monitoring, Physiologic; D012134:Respiratory Protective Devices; D013990:Tidal Volume