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Physiological evaluation of air-fed ensembles.

Authors
Turner-NL; Powell-JB; Sinkule-EJ; Novak-DA
Source
Ann Occup Hyg 2014 Mar; 58(2):241-250
NIOSHTIC No.
20043579
Abstract
The goal of this study was to evaluate the respiratory and metabolic stresses of air-fed ensembles used by workers in the nuclear, chemical, and pharmaceutical industries during rest, low-, and moderate-intensity treadmill exercise. Fourteen men and six women wore two different air-fed ensembles (AFE-1 and AFE-2) and one two-piece supplied-air respirator (SA) at rest (REST) and while walking for 6min at oxygen consumption (V.O2) rates of 1.0 (LOW) and 2.0 l min-1 (MOD). Inhaled CO2 (FICO2), inhaled O2 (FIO2), pressure, and temperature were measured continuously breath-by-breath. For both LOW and MOD, FICO2 was significantly lower (P < 0.03) and FIO2 was significantly greater (P < 0.008) for SA compared with AFE-1 and AFE-2 in women, while in men, similar trends were observed. Significantly lower FICO2 (P < 0.009) and significantly greater FIO2 (P < 0.04) were consistently observed in AFE-1 compared with AFE-2 in men during LOW and MOD. For both men and women, average FICO2 exceeded 2.0% in AFE-2 during MOD. During LOW and MOD, average FIO2 in AFE-1 and AFE-2 dropped <19.5% in men and women. For men and women, average inhalation pressures (PIave) were significantly greater in both air-fed ensembles than SA (P < 0.001) during REST, LOW, and MOD. Inhaled gas temperature was significantly lower in SA than in either air-fed ensemble (P < 0.001). When the air supply was shut off during walking, the time taken for minimum FICO2 to reach 2.0% was <38 s for all three ensembles in both men and women, an observation that has implications for the design of emergency escape protocols for air-fed ensemble wearers. Results show that inhaled gas concentrations may reach physiologically stressful levels in air-fed ensembles during moderate-intensity treadmill walking.
Keywords
Humans; Men; Women; Respiration; Respiratory-rate; Metabolism; Physiological-function; Physiological-factors; Physiological-stress; Physiology; Physiological-testing; Respirators; Respiratory-protection; Respiratory-protective-equipment; Author Keywords; air-fed ensemble; oxygen consumption; protective suits; respirators; women
Contact
Nina L. Turner, Office of Extramural Programs, National Institute for Occupational Safety and Health, 1095 Willowdale Road, Morgantown, WV 26505
CODEN
AOHYA3
Publication Date
20140301
Document Type
Journal Article
Email Address
nturner@cdc.gov
Fiscal Year
2014
NTIS Accession No.
NTIS Price
Issue of Publication
2
ISSN
0003-4878
NIOSH Division
OEP; NPPTL; OD
Priority Area
Manufacturing; Services
Source Name
Annals of Occupational Hygiene
State
WV; PA
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