Can we reduce the effort of maintaining a neutral sitting posture? A pilot study

O’Sullivan, Kieran; McCarthy, Raymond G.; White, Alison; O’Sullivan, Leonard; Dankaerts, Wim

doi:10.1016/j.math.2012.05.016

Cited by 38 publications

(30 citation statements)

References 68 publications

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“…As expected, our EMG analysis demonstrates a decrease of the activation of the lumbar paravertebral muscles on the cushion. This result agrees with the literature that describes a diminution of the activity of those muscles on the same tilted support (Marschall et al, 1995;O'Sullivan et al, 2010aO'Sullivan et al, , 2010bO'Sullivan et al, 2012b;Sabatier, 2014), even if the cushion provides more dynamism in SP. Actually, maintaining static posture is more tiresome than maintaining dynamic posture (O 'Sullivan et al, 2012b).…”

Section: Discussionsupporting

confidence: 92%

“…Actually, maintaining static posture is more tiresome than maintaining dynamic posture (O 'Sullivan et al, 2012b). On the other hand, as shown in the literature, sitting on the cushion does not change abdominal activity (O'Keeffe et al, 2013;O'Sullivan et al, 2012bO'Sullivan et al, , 2012c. Initially, we hypothesized that quadriceps activity could increase the stabilization of the pelvis on the tilted plane (Sabatier, 2014), but this assumption was not confirmed in our subjects.…”

Section: Discussionmentioning

confidence: 56%

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Relevance of adding a triangular dynamic cushion on a traditional chair: A 3D-analysis of seated schoolchildren

Fettweis

Onkelinx

Schwartz

et al. 2017

Clinical Biomechanics

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 56%

Relevance of adding a triangular dynamic cushion on a traditional chair: A 3D-analysis of seated schoolchildren

Fettweis

Onkelinx

Schwartz

et al. 2017

Clinical Biomechanics

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“…Larger RCTs involving people with LBP, with suitable blinding, less confounding variables, and involving a long-term follow-up period, are required to fully confirm the findings of this review. Given the tendency for novel chair designs to differ in several ways (e.g., backrest presence and/or orientation, seat pan angle and motion, lower limb position; O'Sullivan et al, 2012aO'Sullivan et al, , 2012b, studies that identify the specific utility of each design feature may be useful. Many of the included studies were quite old, with specific design features which were unclear.…”

Section: Limitationsmentioning

confidence: 99%

Small Corpora and Pragmatics

Vaughan

Clancy

2013

Yearbook of Corpus Linguistics and Pragmatics 2013

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Objective: This paper systematically reviews the effect of chair backrests and reducing seated hip flexion on low back discomfort (LBD) and trunk muscle activation.Background: Prolonged sitting commonly exacerbates low back pain (LBP). Several modifications to seated posture and chair design have been recommended, including using chairs with backrests and chairs that reduce hip flexion.Method: Electronic databases were searched by two independent assessors. Part 1 of this review includes 26 studies comparing the effect of sitting with at least two different hip angles. In Part 2, seven studies that compared the effect of sitting with and without a backrest were eligible. Study quality was assessed using the PEDro scale.Results: Significant confounding variables and a relatively small number of randomized controlled trials (RCTs) involving people with LBP complicates analysis of the results. There was moderate evidence that chair backrests reduce paraspinal muscle activation, and limited evidence that chair backrests reduce LBD. There was no evidence that chairs involving less hip flexion reduce LBP or LBD, or consistently alter trunk muscle activation. However, participants in several studies subjectively preferred the modified chairs involving less hip flexion. Conclusion:The limited evidence to support the use of chairs involving less seated hip flexion, or the effect of a backrest, is consistent with the limited evidence that other isolated chair design features can reduce LBP.Application: LBP management is likely to require consideration of several factors in addition to sitting position. Larger RCTs involving people with LBP are required.

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“…Some studies investigated the use of seats which have the possibility to assure the anterior pelvic tilt, and consequently, they preserve lumbar lordosis at the sitting posture with less muscular activation, less effort and biggest lumbar curve 8,9 . When the subject works in an office and performs activities including reading, writing, typing and phone calls, they tend to project their trunk forward and not use the back of the chair most of the time 5 .…”

Section: Introductionmentioning

confidence: 99%

“…Many studies have evaluated seats like salli by objective measures, such as postural control, electromyographic activity and lumbar angles 4,9,8,10,11 . Nevertheless, it is necessary to relate qualitative scales with biomechanical parameters.…”

Section: Introductionmentioning

confidence: 99%

Assessment of changes in spine curvatures and the sensations caused in three different types of working seats

Santo

Araújo

2017

Motriz: rev. educ. fis.

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-Aims -This study aimed to evaluate the changes in the spine curvatures and the sensations caused by different types of seats: standard, ischial support and salli. Methods -The analyzes were performed by the kinematics and scales of discomfort and pain in 14 healthy subjects. The data collection occurred in three days, one day for each type of seat. The subjects answered questionnaires and were assessed for placement of kinematic markers used to measure the thoracic, thoraco-lumbar and lumbar angles. Each trial was conducted in a sixty-minute period on each chair. Results and conclusions -The results showed that the salli seat type causes larger lumbar angles, which is consistent with the maintenance of lumbar lordosis. Likewise, the salli seat showed smaller thoraco-lumbar angle, which is consistent with smaller inferior thoracic kyphosis. Paradoxically, the ischial support seat produced less discomfort and pain than salli type. And finally, the longer the sitting position was the higher the score on the discomfort scale.

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Can we reduce the effort of maintaining a neutral sitting posture? A pilot study

Cited by 38 publications

References 68 publications

Relevance of adding a triangular dynamic cushion on a traditional chair: A 3D-analysis of seated schoolchildren

Relevance of adding a triangular dynamic cushion on a traditional chair: A 3D-analysis of seated schoolchildren

Small Corpora and Pragmatics

Assessment of changes in spine curvatures and the sensations caused in three different types of working seats

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