Decoupled pelvis adjustment to induce lumbar motion: A technique that controls low back load in sitting

Geffen, P. van; Reenalda, Jasper; Veltink, Petrus H.; Koopman, Bart

doi:10.1016/j.ergon.2009.08.015

Cited by 15 publications

(26 citation statements)

References 29 publications

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“…Previous studies have proposed numerous dynamic devices for relieving pressure through periodically changing sitting positions; such devices include dynamic lumbar supports, dynamic reclined backrests, and dynamic ischial/femur cushions [20, 21, 24–27]. However, no study to date has examined whether combining these pressure-relieving devices produces a positive or negative effect.…”

Section: Discussionmentioning

confidence: 99%

“…Both lumbar kyphosis and lordosis produce creep load on surrounding soft tissues, decreasing the ability of the intervertebral discs to distribute stress evenly, reducing the distance between the vertebral arches, and increasing the risk of disc degeneration and herniation [1, 6, 14, 19]. Previous studies have shown that avoiding prolonged lumbar kyphosis and lordosis can help prevent lower back pain [1, 20, 21]. In addition, movements that produce lumbar kyphosis and lordosis cause different rates of metabolite transport in the anterior annulus fibrosus, nucleus pulposus, and posterior annulus fibrosus [1, 22].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, movements that produce lumbar kyphosis and lordosis cause different rates of metabolite transport in the anterior annulus fibrosus, nucleus pulposus, and posterior annulus fibrosus [1, 22]. The U.S. Department of Health suggests shifting body weight, such as by lumbar extension or flexion movements, every 15 min to prevent tissue damage [21, 23]. However, this is difficult for wheelchair users who are incapable of autonomous lumbar movement.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies have proposed numerous dynamic devices for relieving lumbar loading, such as dynamic lumbar supports, dynamic reclined backrests, and dynamic ischial/femur cushions [20, 21, 24–27]. Findings have confirmed that such devices can periodically adjust the sitting position, stimulate body movement, and improve the loading from prolonged static sitting [20, 21, 24–27].…”

Section: Introductionmentioning

confidence: 99%

“…Findings have confirmed that such devices can periodically adjust the sitting position, stimulate body movement, and improve the loading from prolonged static sitting [20, 21, 24–27]. In clinical observations, many wheelchair users employ more than one of these pressure-relieving devices simultaneously because their functions do not conflict with one another.…”

Section: Introductionmentioning

confidence: 99%

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Comparing the effects of different dynamic sitting strategies in wheelchair seating on lumbar-pelvic angle

Peng

Tseng

et al. 2016

BMC Musculoskelet Disord

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BackgroundProlonged static sitting in a wheelchair is associated with an increased risk of lower back pain. The wheelchair seating system is a key factor of this risk because it affects spinal loading in the sitting position. In this study, 7 dynamic sitting strategies (DSSs) are examined: lumbar prominent dynamic sitting (LPDS), back reclined dynamic sitting (BRDS), femur upward dynamic sitting (FUDS), lumbar prominent with back reclined dynamic sitting (LBDS), lumbar prominent with femur upward dynamic sitting (LFDS), back reclined with femur upward dynamic sitting (BFDS), and lumbar prominent with back reclined with femur upward dynamic sitting (LBFDS). The objective of this study was to analyze the biomechanical effects of these sitting strategies on lumbar-pelvic angles.MethodsTwenty able-bodied participants were recruited for the study. All participants performed LPDS, BRDS, FUDS, LBDS, LFDS, BFDS, and LBFDS in a random order. All lumbar-pelvic angle parameters, including the static lumbar angle, static pelvic angle, lumbar range of motion, and pelvic range of motion were measured and compared.ResultsResults show that LBDS and LBFDS enabled the most beneficial lumbar movements, although the difference between the 2 strategies was nonsignificant. BRDS and BFDS enabled the most beneficial pelvic movements, although the difference between the 2 strategies was nonsignificant. Among all the upright DSSs, LPDS and LFDS enabled the most beneficial lumbar and pelvic movements, although no significant difference was observed between these 2 strategies.ConclusionsWe identified the effects and differences among 7 DSSs on lumbar-pelvic angles. Wheelchair users can choose the most suitable DSS that meets their needs. These findings may serve as a reference for practicing physicians or wheelchair users to choose an appropriate dynamic wheelchair seating system.Trial registration ISRCTN12389808, 18th November 2016, retrospectively registered.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparing the effects of different dynamic sitting strategies in wheelchair seating on lumbar-pelvic angle

Peng

Tseng

et al. 2016

BMC Musculoskelet Disord

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Comfort Driven Redesign: The Case of Library Chairs

Califano

Fiorillo

Baglivo

et al. 2021

Lecture Notes in Mechanical Engineering

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University students spend most of their time in a sitting position. Prolonged sitting on ill-fitted furniture and the resulting lousy posture is making students having different musculoskeletal disorders and is strictly related to students learning outcomes. This study aims to improve postural comfort of chairs placed inside the Science & Technology Library at the University of Salerno. A previous study about these library chairs showed that the lumbar area was the most suffering part while perceived (dis)comfort was dependent on time. Based on this, an ergonomic redesign and, consequently, manufacturing of the chair has been done. A perceived-comfort comparison between the library chair and the redesigned one has been performed. A statistical sample of 28 healthy students performed a 20-min experiment two times, alternatively on the library chair and the redesigned one. The 20-min experiment was divided into two 10-min tasks (“Reading & Writing” and “Laptop use”) to simulate a study day. The participants’ postures were acquired non-invasively using cameras and processed by Kinovea; questionnaires were used to rate the perceived subjective (dis)comfort. A procedure for improving an existing product through a comfort-driven redesign is proposed. Results showed the redesigned library chair lead on increasing postural comfort (particularly in the lumbar area) thanks to the new design and modifications.

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Is physical capacity associated with the occurrence of musculoskeletal symptoms among office workers? A cross-sectional study

Cabral

Moreira

Barros

et al. 2019

Int Arch Occup Environ Health

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Decoupled pelvis adjustment to induce lumbar motion: A technique that controls low back load in sitting

Cited by 15 publications

References 29 publications

Comparing the effects of different dynamic sitting strategies in wheelchair seating on lumbar-pelvic angle

Comparing the effects of different dynamic sitting strategies in wheelchair seating on lumbar-pelvic angle

Comfort Driven Redesign: The Case of Library Chairs

Is physical capacity associated with the occurrence of musculoskeletal symptoms among office workers? A cross-sectional study

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