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GOOD POSTURE

The spine is perfectly designed for normal standing posture. It consists of a series of curves called the Cervical, Thoracic and Lumbar. These three curves make up a natural ‘S’ curve, which we associate with good posture. It has been estimated that these three curves lead to an increase in strength, which is ten times greater than that of a straight column.

The cervical curve (neck) has seven small vertebrae, which have good movement but are not designed to transmit large amounts of weight or force.

The thoracic curve carries an intermediate amount of weight or force and is a relatively inflexible part of the spine. Its mobility is affected by the rib cage, to which it is attached.

The lumbar spine is built for strength and designed to absorb forces, transmit weight and is quite mobile in forward and back bending.

People sit in poor posture for 3 reasons

Forward slip
If we sit for 10 minutes or more, the muscles in our lower back get tried and we slide forward on our seats. As our pelvis moves forward our back curves into the ‘C’ shape of poor posture putting pressure on the spine and over time creating muscle fatigue.

Inadequate Lumbar Support
Many office chairs have insufficient lumbar support because they fail to support the lower back which forces the muscles to work harder to support the spine and lower back pain soon results.

Unstable forward tilt
Tilting the chair forward is a comfortable sitting position for reading and writing; however, many people fail to use their forward tilt because in this position they start to slide forward in their chairs.

As can be seen in the graph below, sitting in poor posture almost doubles the stress on the spine than standing.

Nachemson A - The Lumber Spine - An Orthopedic Challenge: Spine 1:59 - 71, March 1976

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