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what is an ergonomic office chair? |
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what is an ergonomic office chair?
a good ergonomic office chair, as defined by the occupational safety
and health administration (osha), "provides necessary support to the
back, legs, buttocks, and arms, while reducing exposures to awkward
postures, contact stress, and forceful exertions." ergonomic office
chairs are designed to accommodate users for long periods of time in
positions that will help to minimize stress and tension. one of the
most common work-related injuries is lower back pain. an ergonomic
office chair must provide adequate lumbar support to the user, which
will often alleviate lower back pain. it is also very important to
get up from your chair and take a break from sitting in the same,
repetitive position. do some stretching or walk to the water
fountain and back. anything to get the blood flowing and your
muscles loosened will help.
chair seat
an ergonomic office chair should have a seat that is wide enough and
deep enough to cover the entire buttocks and upper thighs. many
ergonomic chairs offer a seat depth function, which allows the user
to adjust the seat to the correct positioning behind the knees. the
best position for the seat is 1-2” behind the back of your knees.
the seat should be height adjustable. most ergonomic office chairs
have pneumatic seat height adjustment. it is important to sit with
your knees at a 90 degree angle and seat height adjustment will
allow this.
the seat should have some type of tilt function like forward seat
tilt or synchro-tilt. this is important when the user reclines. as
the user reclines a poor angle is created at the knees and/or torso.
a seat that tilts as the chair reclines will help to eliminate this
problem.
the seat frame should be constructed from steel to provide the
safest product possible. the seat should also be well padded and
covered with a high quality leather, fabric or mesh. the upholstery
chosen should be soft to the touch and comfortable for the user to
sit in for long hours. many ergonomic mesh chairs are being designed
with mesh seats that have no padding/backing. these chairs are often
ergonomic but a well padded seat is much better for sessions of 8+
hours.
backrest
ergonomic office chairs have backrests that are large enough to
accommodate the entire back of the individual using the chair. the
chair back should have the width and height to support the entire
shoulder region. most ergonomic chairs have a height adjustable
backrest. this allows the user to adjust the chair back to a
position in which the upper back and shoulders are fully supported.
an ergonomic chair will have a reclining function or backrest tilt
function. this allows the user to lean back and adjust positions
throughout the day. changing sitting positions is encouraged to help
with blood flow and alleviate stress.
it is important to choose upholstery that will be comfortable for
each particular user and application. leather is the most popular
upholstery used on office chairs but sometimes gets hot when used
for long periods. this can often cause unwanted sweating and
overheating. fabric is often a good choice when it is well padded
and soft to the touch. sometimes fabric can be coarse or lack proper
padding. these are the types of fabrics to avoid as they will not be
good for the long haul. mesh back ergonomic chairs have come to be
very popular. mesh chairs provide better air circulation which keeps
the user cooler throughout the day. mesh also contours to different
body types very well which can make it very comfortable. as with the
fabrics, make sure to choose a mesh that is both strong and soft.
you want it to be comfortable and to hold its elasticity well.
armrests
the armrests on an ergonomic chair should be height adjustable and
either swivel or adjust in width. the best positioning for your arms
is to have your elbows at a 90 degree angle with your shoulders
fully relaxed. it is also important that there isn’t too much or too
little space in between your inner arm and side. if the space is too
small, then unwanted rubbing can occur. if the space is too large,
then stress and tension can be placed on the shoulders.
ergonomic armrests should have no leading edges and should not be
rough to the touch. all edges should be rounded and the arms should
be well padded. the user should be able to lean on the armrests for
extended hours without feeling discomfort due to a hard surface.
lumbar support
a good ergonomic chair will provide good support to your lower back,
known as your lumbar region. many chairs will feature a natural
curve or roll in the backrest of the chair. others will have an
inflatable bag or object that is used to add or release pressure to
the lumbar area.
make sure the chair has an adjustable lumbar support system. many
chairs offer lumbar sections that adjust up and down with adjustable
back height. many ergonomic chairs have freely adjusting lumbar
pads. it is important to have the ability to adjust the lumbar
support to a region specific to the user.
headrest
many ergonomic chairs feature a headrest or give the user the option
to add one. the headrest should not push the back of the users head
at a downward angle in any way. this will cause stress and tension
to the neck muscles. many ergonomic headrests are designed to cradle
the neck and support the head.
an ergonomic headrest should be adjustable. a good headrest will
adjust up and down and should also tilt to accommodate different
viewing angles
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