MESSAGE
| DATE | 2020-05-19 |
| FROM | Ruben Safir
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| SUBJECT | Subject: [Hangout - NYLXS] Effects of wearing N95 and surgical facemasks on
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Abstract
Aim: The study was aimed at investigating the effects of wearing N95 and
surgical facemasks with and without nano-functional treatments on
thermophysiological responses and the subjective perception of
discomfort. Method: Five healthy male and five healthy female
participants performed intermittent exercise on a treadmill while
wearing the protective facemasks in a climate chamber controlled at an
air temperature of 25°C and a relative humidity of 70%. Four types of
facemasks, including N95 (3M 8210) and surgical facemasks, which were
treated with nano-functional materials, were used in the study. Results:
(1) The subjects had significantly lower average heart rates when
wearing nano-treated and untreated surgical facemasks than when wearing
nano-treated and untreated N95 facemasks. (2) The outer surface
temperature of both surgical facemasks was significantly higher than
that of both N95 facemasks. On the other hand, the microclimate and skin
temperatures inside the facemask were significantly lower than those in
both N95 facemasks. (3) Both surgical facemasks had significantly higher
absolute humidity outside the surface than both N95 facemasks. The
absolute humidity inside the surgical facemask was significantly lower
than that inside both N95 facemasks. (4) Both surgical facemasks were
rated significantly lower for perception of humidity, heat, breath
resistance and overall discomfort than both N95 facemasks. The ratings
for other sensations, including feeling unfit, tight, itchy, fatigued,
odorous and salty, that were obtained while the subjects were wearing
the surgical facemasks were significantly lower than when the subjects
were wearing the N95 facemasks. (5) Subjective preference for the
nano-treated surgical facemasks was the highest. There was significant
differences in preference between the nano-treated and untreated
surgical facemasks and between the surgical and N95 facemasks.
Discussion: We discuss how N95 and surgical facemasks induce
significantly different temperature and humidity in the microclimates of
the facemasks, which have profound influences on heart rate and thermal
stress and subjective perception of discomfort.
--
So many immigrant groups have swept through our town
that Brooklyn, like Atlantis, reaches mythological
proportions in the mind of the world - RI Safir 1998
http://www.mrbrklyn.com
DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002
http://www.nylxs.com - Leadership Development in Free Software
http://www.brooklyn-living.com
Being so tracked is for FARM ANIMALS and extermination camps,
but incompatible with living as a free human being. -RI Safir 2013
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