Finding the right ergonomic chair is a common problem especially
for people who want to purchase new equipment to make workstations
safer and healthier places. There are many "ergonomic"
chairs available but it can be a mistake to purchase one simply
because it is labelled "ergonomic".
Ergonomic chairs are designed to suit a range of people;
however, there is no guarantee that they will suit any one
person in particular. For example, a chair could be too high
and the arm rests too far apart for a short, slim person.
In addition, chairs may not suit every task or arrangement
at the workstation. A chair becomes ergonomic only when it
specifically suits a worker's size (body dimensions), his
or her particular workstation, and the tasks that must be
performed there. It is possible to find the right chair although
it is not always easy.
Ergonomic Chair
Why is finding the right chair so important?
Today, in industrialized countries, many people sit for most
of the time that they are awake. They sit while having breakfast,
while going to work in cars or buses, in school classrooms,
in meetings, in offices, during dinner, and at home while
watching television. Many people also sit at work operating
machines which new technology has developed to replace manual
work. Although sitting requires less physical effort than
standing or walking it puts a lot of stress on lumbar area.
Combined effects of a sedentary lifestyle and a job that requires
sitting can lead to many health problems.
What do you need to know about selecting a good "ergonomic"
chair?
The selection of a suitable chair is a critical step in preventing
health problems in people who work in a sitting position.
With the ergonomics approach, sitting is viewed as a specific,
specialized activity which is influenced by the way that a
sitting person interacts with the working environment.
Several basic concepts should be considered:
One chair does not fit everyone. The users' body dimensions
must be used when selecting a chair so that it does not strain
one part of the body while fitting another.
Collect data about the user's body height. The optimal seat
height is about one quarter of the body height. This is only
a rule of thumb since the torso-to-leg ratio can vary widely..
No one chair is suitable for every activity. For example,
dentists require a different chair than do industrial workers
or computer operators
Consider maintenance and repair costs. Check with the manufacturer
for items to inspect for and how often inspection should be
done.
What are the features of a "good" chair?
Some features are mandatory for a good chair regardless of
how you intend to use it:
Adjustability - Check to see that seat height is adjustable.
Seat height range - Check whether the seat height can be adjusted
to the height recommended for the worker(s) who will use it.
Other chairs may have to be selected for very short or tall
workers.
Backrest - Check to see that the backrest is adjustable both
vertically and in the frontward and backward direction.
Seat depth - Select the seats that suit the tallest and the
shortest users
Stability - Check for the stability of the chair; a five-point
base is recommended.
Other features to consider
See if the selected chair has features that will help someone
do their job better. Arm rests with adjustable heights are
good for computer operators. Wider or narrower arm rests may
also be required depending on the worker's dimensions and
tasks they do.
See if the selected chair has features that will make doing
a job more difficult. An example may be that someone may be
using a chair with casters or wheels when a stable and stationary
work position would be better. If chairs with casters are
needed, choose ones that match the type of flooring you have
(carpeting or hard floors).
Who should pick out the chair?
Personal preference is essential to the process of selecting
a chair.
After some suitable chairs have been identified, allow the
person who will use the chair most to try out the chair in
a real work situation. It is especially useful to obtain several
sample chairs for a trial comparison by those who will be
using them.
Make sure that the chair meets the needs of the workers and
their jobs before any final selection is made.
Can a chair solve all of the ergonomic problems of working
in a sitting position?
A well-designed chair allows the user to sit in a balanced
position. Buying an ergonomic chair is a good beginning but
it may not bring the benefits expected. The actual sitting
position depends on an individual's personal habits; he or
she has to learn and practice how to sit properly.
Also, remember that the chair is only one of the components
to be considered in workstation design. All the elements such
as the chair, footrest (if needed), work surface, document
holders, task lighting and so on need to have flexibility
and adjustability to be "designed in."
Ergonomic
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