Postural versus chair design impacts upon interface pressure

Vos, Gordon A.; Congleton, Jerome J.; Moore, James S.; Amendola, Alfred A.; Ringer, Larry J.

doi:10.1016/j.apergo.2005.09.002

Cited by 54 publications

(36 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…During static sitting there can be many reasons for discomfort, including inappropriate distributions of pressure at the seat interfaces (e.g., Gyi and Porter, 1999), sheer forces at the seat interfaces (Hobson, 1992), and extremes of posture or the need for muscle activity to maintain posture (Hobson, 1992;Vos et al, 2006). These sources of discomfort may also be present during oscillation but are supplemented by the discomfort caused by motion-induced movements of the body, including discomfort associated with voluntary and involuntary muscle activity used to control the movement of the body (e.g.…”

Section: The Location Of Discomfortmentioning

confidence: 99%

“…Greater discomfort at the ischial tuberosities has also been found on a rigid seat without backrest than on a cushioned train seat during 1-Hz lateral oscillation (Beard and Griffin, 2012a). Pressure at the ischial tuberosities may be reduced by leaning back on a backrest (e.g., Vos et al, 2006;Kyung and Nussbaum, 2008). During lateral and roll oscillation, each ischial tuberosity is subjected to alternating downward forces.…”

Section: The Location Of Discomfortmentioning

confidence: 99%

See 1 more Smart Citation

Discomfort of seated persons exposed to low frequency lateral and roll oscillation: Effect of seat cushion

Beard

Griffin

2014

Applied Ergonomics

View full text Add to dashboard Cite

The discomfort caused by lateral oscillation, roll oscillation, and fully roll-compensated lateral oscillation has been investigated at frequencies between 0.25 and 1.0 Hz when sitting on a rigid seat and when sitting on a compliant cushion, both without a backrest. Judgements of vibration discomfort and the transmission of lateral and roll oscillation through the seat cushion were obtained with 20 subjects. Relative to the rigid seat, the cushion increased lateral acceleration and roll oscillation at the lower frequencies and also increased discomfort during lateral oscillation (at frequencies less than 0.63 Hz), roll oscillation (at frequencies less than 0.4 Hz), and fully roll-compensated lateral oscillation (at frequencies between 0.315 and 0.5 Hz). The root-sums-of-squares of the frequency-weighted lateral and roll acceleration at the seat surface predicted the greater vibration discomfort when sitting on the cushion. The frequency-dependence of the predicted discomfort may be improved by adjusting the frequency weighting for roll acceleration at frequencies between 0.25 and 1.0 Hz.

show abstract

Section: The Location Of Discomfortmentioning

confidence: 99%

Section: The Location Of Discomfortmentioning

confidence: 99%

Discomfort of seated persons exposed to low frequency lateral and roll oscillation: Effect of seat cushion

Beard

Griffin

2014

Applied Ergonomics

View full text Add to dashboard Cite

show abstract

“…Postural factors include backrest angle, leaning forward, upright postures, reclined postures, use of armrests, and leg position. 18 Hip adductor spasticity can adversely affect the distribution of BSIP according to muscle tone and leg position. As such, hip adductor spasticity negatively effects the distribution of BSIP.…”

Section: Discussionmentioning

confidence: 99%

The effects of phenol neurolysis of the obturator nerve on the distribution of buttock-seat interface pressure in spinal cord injury patients with hip adductor spasticity

et al. 2010

View full text Add to dashboard Cite

Objectives: Hip adductor spasticity may adversely effect shear-force and pressure distribution on the buttocks, where ulcerations most frequently appear in patients with spinal cord injury (SCI). Phenol neurolysis of the obturator nerve (ON) is commonly used to manage hip adductor spasticity. This study aimed to determine the effects on the distribution of buttock-seat interface pressure (BSIP) in a group of SCI patients with adductor spasticity that underwent ON blockade with phenol. Methods: We reviewed the records of SCI patients that were admitted to our clinic between January 2009 and December 2009. BSIP values (obtained with an X-sensor 48) and hip adductor spasticity levels of SCI patients with hip adductor spasticity that underwent ON blockade with phenol were collected. BSIP distributions of the patients were divided into two portions: first one is the BSIP distribution at the pressure p37 mm Hg, and the second one is at the pressure 437 mm Hg. Results: The study included 20 SCI patients (19 males and 1 female), with a mean age of 42.85 ± 13.24 years. Although the percentage of BSIP distribution at p37 mm Hg range increased significantly (Po0.001), after ON neurolysis, BSIP distribution at 437 mm Hg range decreased significantly (Po0.001). In addition, mean hip adductor spasticity decreased significantly after ON neurolysis (Po0.001). Conclusion: Phenol neurolysis of the ON is a promising treatment for the management of hip adductor spasticity in SCI patients and also has positive effects on BSIP, which has a crucial function in the development of pressure ulcers.

show abstract

“…Through many studies, it was also revealed that reclining of the backrest has some advantages such as muscle activity (Anderson et al, 1974), and contact pressure reduction at buttocks (Vos et al, 2006). However, it is reported that the use frequency of the backrest in actual sitting work is low.…”

Section: J Ergon Soc Koreamentioning

confidence: 99%

Development of Tilting Chair for Maintaining Working Position at Reclined Posture

Hyeong¹,

Roh²,

Park³

et al. 2014

Journal of the Ergonomics Society of Korea

View full text Add to dashboard Cite

Objectiv e: The aim of this study is to develop an office chair enabling to keep working at reclined sitting posture.Background: Sedentary workers are supposed to change the posture frequently during long hours of sitting. A reclined sitting position has been recommended to reduce disc pressure. But slumped sitting posture caused by the buttock sliding forward without any adjustment of back reclining is commonly observed. The worker seems to have tendency to change the sitting posture maintaining working condition. We assumed the reason to be their hands movement away from the working space when tilting backward.Method: Slide mechanism allowing seat to move forward was designed to maintain the hand position in working space during reclining. A prototype was manufactured and tilting motion was analyzed using motion capture system. Four experiment chairs were tested including the manufactured prototype chair and three other commercial chairs.Results: A backward movements of the hand position were 13.0mm, 101.7mm, 156.1mm and 139.3mm at the prototype chair, compared to chair B, chair C and chair D, respectively. And the movement was remarkably small at the prototype chair. Conclusion:The developed seat sliding chair allows back tilting maintaining hand position at working space. We expect the user tilting back more often than normal tilting chair during seated work. But further investigation is required to figure out the effectiveness of the developed chair using prolonged working hours. Application:The developed office chair directly affects commercialization.

show abstract

Postural versus chair design impacts upon interface pressure

Cited by 54 publications

References 14 publications

Discomfort of seated persons exposed to low frequency lateral and roll oscillation: Effect of seat cushion

Discomfort of seated persons exposed to low frequency lateral and roll oscillation: Effect of seat cushion

The effects of phenol neurolysis of the obturator nerve on the distribution of buttock-seat interface pressure in spinal cord injury patients with hip adductor spasticity

Development of Tilting Chair for Maintaining Working Position at Reclined Posture

Contact Info

Product

Resources

About