vibration

This blog post is about sitting with a backrest, which could be the back part of a chair, or something added to the chair for additional support and comfort.  Support and relief Virtually any backrest will give relief that a tired back will appreciate. Support is certainly preferable when we sit for longer periods of time to enjoy reading, TV, a movie, or, if we are lucky, live theater.  With the trunk slightly inclined against a backrest, there is less compressive force due to gravity acting on the spine. In addition, the trunk stabilizer muscles get a break. When we are driving or traveling by plane or train, a backrest also confers additional protection from vibration or any untoward impact.  Read more