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The Simmer Season.
We all seem to simmer and melt in
the summer. It feels like our bodies are as hot as the air -
but actually, your body temperature doesn't vary much at all.
Even when you move from frosty air
conditioning to direct sun outside, your core temperature
doesn't fluctuate enough to even be measured.
We live in amazing bodies!
When body temperature does begin to
rise because of the environment, lots of automatic systems are
triggered by the hypothalamus in the brain. The most
noticeable is the moisture coming from sweat glands, to
evaporate on the skin and cool it off. (And you thought
sweating was a bad thing!) Blood vessels also rise closer to
the skin so that they can cool, as well.
Captivating
Capillary Action
There are fabrics that are better
to wear on a hot day than others. Polyesters and many
otherman-made fibers tend to trap heat and moisture on the
skin and feel awful. Cotton,
summer-weight wool, linen, and silk all are natural fibers and
they work on your skin just as they do when growing - they
channel moisture.
Imagine three fibers in your
garment - we'll call them A, B and C. Your skin begins to
perspire, and Fiber A sops up the moisture. Your skin begins
to cool down; but it doesn't stop there. Fiber B (adjacent to
Fiber A) draws the moisture out of Fiber A. Now A is nearly
dry (and ready to sop up more from your skin), and B is moist.
Fiber C does the same to B - and then the moisture evaporates
into the air. This is the same way water moves from cell to
cell in the plants or animals that produce cotton, wool and
silk. It works just as well when
the fibers are made into fabric, which is why you're more
comfortable in natural fibers in summer than in less "wicking"
fibers.
It's useful to note
that even though the water evaporates, it leaves behind the
salt and acidic residue from the perspiration. If you've sweated in a garment, it's advisable
to get it cleaned so that the residue doesn't show up over
time as permanent staining.
Staying
Cool
It seems strang that people who
live in the desert cover themselves in garments from head to
toe. Looks hot, doesn't it? Actually, it's a great way to keep
cool. The fabric shades the skin
from sun. Since there are only rare
opportunities for shade in desert areas, making shade with
garments is one way to survive.
The garments are also loose,
allowing sweat on the skin to evaporate into the air trapped
inside the garment. This is why you'll feel cooler in a loose
shirt than a tight t-shirt when it's warm outside. The fabric
tight on your skin cools, but your skin doesn't get the
benefit of the evaporation.)
Read More About
It
Intrigued? Use the internet to read
more about how our bodies handle heat, and how to stay
cool.
- USA Today
article on sweat, body
temperature and more. (Also lots of links to other
articles on similar subjects in easy-to-digest
language.)
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