This is chairs formula an ergonomic, To avoid lower back pain

illustration (Photo: Thinkstock)

Jakarta, back pain can be considered a disease typical office workers who sit at a computer all day. Besides the wrong sitting position, seat factor also can be a trigger. Actually there is a formula to determine the size of the ergonomic seats

"To prevent the occurrence of lower back pain, need to be made ergonomic chair suitable body anthropometry. Shape and size can affect the position of chair curved spine," said Dr. Ninis Sri Prasetyowati, Sp. KFR doctor of Physical Medicine and Rehabilitation Specialists of the faculty of medicine at the event Promotion Ph.D. at Faculty of medicine, on Wednesday (06/02/2013).

In disertasainya, Dr. Ninis explained that non-specific low back pain caused by sitting a lot that is not right that a change curved spine. Edges can increase muscle tension in the lower back. In addition, various studies have also found that women are more susceptible exposed to the lower back pain due to pelvic structures are different from men. Sitting for a long time will increase the load received lower spine. This burden is greater than the received body when standing.

Dr. Ninis has long conducted research to determine the formula for the size of an ergonomic chair. It's just that the formula is made using high school student sample. However, Dr Ninis admitted this formula can be applied to the employees of the office. "I researched on the school children are height approximately 150-170 cm. Employee's office an average height of amounting it, so can be used also for office employees," explained Dr. Ninis.

Chair formula an ergonomic, considering a leg length or width leg and pelvis. The length of the foot is divided into two parts, the upper leg length and the length of the lower limbs. This measure is divided into 3 categories.

Medium-size, regarded as small if the length is 42-45 cm, is said to be if the length is 46-49 cm, and large if the length is 50-53 cm. Small-size, regarded as small if the length is 37-39 cm, while if the length is 40-42 cm, and large if the length is 43-45 cm. For pelvic width, said little if width 26-28 cm, is said to be if the width is 29-31 cm, and large if its width 32-34 cm.

To determine the size of the chair to be used, the categorization is taken if it meets at least 2 of the same size. For example, a subject has a size of 48.5 cm (medium), 39.2 cm (small) and pelvic width 29 cm (medium), so he put in a category.

While the formula determining the appropriate size of the seat medium-size, small-size, and the width of the pelvis, is as follows:

- For small groups, then the length of pedestal seat 41 cm, the high of pedestal seat 38.5 cm and the wide pedestal seat 37 cm.

- For medium groups, then the length of pedestal seat 45 cm, the high of pedestal seat 41.5 cm and the wide pedestal seat 40 cm.

- For big groups, then the length of pedestal seat 49 cm, the high of pedestal seat 44.5 cm and the wide pedestal seat 43 cm.

For backrest on backs, tilt angle is 100 degrees to the rear. If compared, seats in schools today have 90-degree angle so that the backs are in an upright position.