Investigation of the Validity of an Experimental Model for the Estimated Shear Force on Buttocks in a Comfortable Sitting Posture

Kobara, Kazukuni; Eguchi, Atsuko; Watanabe, Susumu; Ishiura, Yuichi; Fujita, Daisuke; Nishimoto, Tetsuya; Shinkoda, Koichi

doi:10.1589/jpts.20.157

Cited by 10 publications

(8 citation statements)

References 3 publications

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“…Additional considerations and clinical studies may be needed to investigate whether the same pressure-relieving effect is found for patients or the elderly, as well as the impact of covariates such as age and gender. Further studies are needed to investigate the pressure-relieving effect of our continuous lateral turning device, considering interface pressure and shear force together 24 ) .…”

Section: Discussionmentioning

confidence: 99%

Effects of a continuous lateral turning device on pressure relief

Kim

Choi

et al. 2016

J Phys Ther Sci

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[Purpose] The purpose of this study was to examine the pressure-relieving effects of a continuous lateral turning device on common pressure ulcer sites. [Subjects] Twenty-four healthy adults participated. [Methods] The design of our continuous lateral turning device was motivated by the need for an adequate pressure-relieving device for immobile and/or elderly people. The procedure of manual repositioning is embodied in our continuous lateral turning device. The interface pressure and time were measured, and comfort grade was evaluated during sessions of continuous lateral turning at 0°, 15°, 30°, and 45°. We quantified the pressure-relieving effect using peak pressure, mean pressure, and pressure time integration. [Results] Participants demonstrated pressure time integration values below the pressure-time threshold at 15°, 30°, and 45° at all the common pressure ulcer sites. Moreover, the most effective angles for pressure relief at the common pressure ulcer sites were 30° at the occiput, 15° at the left scapula, 45° at the right scapula, 45° at the sacrum, 15° at the right heel, and 30° at the left heel. However, angles greater than 30° induced discomfort. [Conclusion] Continuous lateral turning with our specially designed device effectively relieved the pressure of targeted sites. Moreover, the suggested angles of continuous lateral turning can be used to relieve pressure at targeted sites.

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Section: Discussionmentioning

confidence: 99%

Effects of a continuous lateral turning device on pressure relief

Kim

Choi

et al. 2016

J Phys Ther Sci

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“…Moreover, Aissaoui et al 14 ) reported that the pressure on the back support during sitting on a chair was increased by elevating leg support. In addition, there is a strong relationship between the reaction force on the back support and the horizontal force acting on the buttocks 20 ) . The pressure, i.e., the reaction force, on the back support is increased by increasing the angle of backward pelvic tilt.…”

Section: Discussionmentioning

confidence: 99%

Investigation of effect of leg support elevation timing on the horizontal force acting on the buttocks in a reclining wheelchair

et al. 2015

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[Purpose] The purpose of this study was to investigate the effect of the timing of leg support elevation on the horizontal force acting on the buttocks in a reclining wheelchair. [Subjects and Methods] The participants were 17 healthy men. Two experimental conditions were tested: the leg-down and leg-up conditions. The back support was reclined at increasing angles, from the initial upright position (IUP), proceeding to the fully reclined position (FRP), and returned to the upright position (RUP). The posterior inclination phase was from IUP to FRP, and the returning inclination phase was from FRP to RUP. [Results] The horizontal force under the leg-up condition was significantly higher than that under the leg-down condition in all positions of back support. [Conclusion] The leg supports should be positioned downward before reclining the back support of a wheelchair.

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“…The pressure applied to the back support also increases if the trunk and pelvis are tilted backward at a large angle. The reaction force applied to the back support has a strong relationship to the shear force applied to the buttocks 27 , 28 ) . In addition, Gilsdorf et al 15 ) reported that leaning forward, away from the back support, returned the shear force applied to the buttocks to a value close to that at the IUP after the back support reclined.…”

Section: Discussionmentioning

confidence: 99%

Effect of Rotational Axis Position of Wheelchair Back Support on Shear Force when Reclining

et al. 2014

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[Purpose] The purpose of this study was to investigate the influence of the rotational axis position of a reclining wheelchair’s back support on fluctuations in the shear force applied to the buttocks while the back support is reclined. [Subjects] The subjects were 12 healthy adult men. [Methods] The shear force applied to the buttocks was measured using a force plate. This study used two different experimental conditions. The rotational axis of the back support was positioned at the joint between the seat and the back support for the rear-axis condition, and was moved 13 cm forward for the front-axis condition. [Results] With the back support fully reclined, the shear forces were 11.2 ± 0.8%BW and 14.1 ± 2.5%BW under the rear-axis and front-axis conditions, respectively. When returned to an upright position, the shear forces were 17.1 ± 3.1%BW and 13.8 ± 1.7%BW under the rear-axis and front-axis conditions, respectively. Significant differences appeared between the two experimental conditions (p < 0.01). [Conclusion] These results suggest that the shear force value could be changed by altering the position of the back support’s rotational axis during reclining.

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Investigation of the Validity of an Experimental Model for the Estimated Shear Force on Buttocks in a Comfortable Sitting Posture

Cited by 10 publications

References 3 publications

Effects of a continuous lateral turning device on pressure relief

Effects of a continuous lateral turning device on pressure relief

Investigation of effect of leg support elevation timing on the horizontal force acting on the buttocks in a reclining wheelchair

Effect of Rotational Axis Position of Wheelchair Back Support on Shear Force when Reclining

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