What does a backrest actually do to the lumbar spine?

Article Abstract:

A backrest stabilizes the lumbar spine by providing support to the lower back, which facilitates kyphosis, contrary to the belief that it facilitates lumbar lordosis. Seats with vertical or anteriorly curved backrests also facilitate kyphosis, which may be the result of pushing the lumbar spine backwards against the backrest to enhance stability. However, the reason behind the production of lordosis while using anteriorly curved backrest, and kyphosis while using traditional backrests in active sitting, remains unclear.

Health aspects, Abnormalities, Kyphosis, Seating (Furniture)

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Changes in spinal curvature and proprioception of schoolboys carrying different weights of backpack

Article Abstract:

Spinal curvature and proprioception of some schoolboys during normal upright stance without a backpack and while carrying a specially adapted backpack are measured and compared. A significant flattening of the lumbar lordosis and the upper thoracic kyphosis is found with increasing backpack load and a significant decrease in the thoraco-lumbar and lumbar repositioning consistencies.

Hong Kong, Physiological aspects, Students, Backpacks, Spinal curvatures

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An empirical study of preferred settings for lumbar support on adjustable office chairs

Article Abstract:

The preferred settings for lumbar support height and depth by 43 male and 80 female office workers were examined. The mean preferred height setting was 190 mm above the compressed seat surface and the mean depth setting was 387 mm. Body Mass Index (BMI) and gender on mean preferred lumbar support height showed a significant link between preferred height and BMI.

Research, Posture, Chair design

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