Study of generation mechanism and prevention of pressure sore by share force

Dairiki, Hiroki; Huzii, Mikiyasu; Awa, Keizou; Iwatsubo, Takuzo

doi:10.1299/jsmemecjo.2004.4.0_217

Cited by 5 publications

(4 citation statements)

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“…Although the risk of decubitus ulcer was once considered to be determined by "compression  time," it is now considered to be regulated by "stress (compressive stress, shear stress, and tensile stress)  time  frequency" 15 . In addition, results of recent studies on decubitus ulcers have verified that complex stress is generated inside the body.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, results of recent studies on decubitus ulcers have verified that complex stress is generated inside the body. Not only compressive force, but also shear force acts on the skin surface (surface shear force) 15 . For these reasons, shear force have to be considered when trying to prevent decubitus as well as the magnitude and duration of pressure.…”

Section: Discussionmentioning

confidence: 99%

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The influence of the distance between the backrest of a chair and the position of the pelvis on the maximum pressure on the ischium and estimated shear force

Kobara

Eguchi

Watanabe

et al. 2008

Disability and Rehabilitation: Assistive Technology

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Purpose: As an alternative for some people with leg disorders from becoming bedridden, thus the patients have been forced to sit in a wheelchair for a long period of time. The purpose of this study was to investigate the relation between the backrest of a chair and the position of the pelvis on the maximum pressure at the ischium and the estimated shear force encountered while sitting in a chair.Methods: Ten healthy males aged 22.4±2.3 years without pathologies in the leg and/or trunk participated in this study. The subjects were instructed to sit in a chair and the pressure and shear forces were measured under three sitting conditions: in the standard position, 5cm forward position, and 10cm forward position. The positions of the pelvis on the maximum pressure at the ischium were measured by an instrument to measure pressure distribution and the shear forces were estimated using an experimental model proposed by us.Results: Comparisons were made among three sitting positions; the range of displacement of the maximum pressure point was not significant. The estimated shear force on the seat was 15.5±12.4 N in the standard position, 34.4±8.5 N in the 5-cm forward position, and 53.2 ±16.7 N in the 10-cm forward position. There were significant differences among the three values (p<0.01).Conclusions: Displacing the pelvis forward and leaning against the backrest tends to increase the shear force and raise the risk of decubitus ulcers.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The influence of the distance between the backrest of a chair and the position of the pelvis on the maximum pressure on the ischium and estimated shear force

Kobara

Eguchi

Watanabe

et al. 2008

Disability and Rehabilitation: Assistive Technology

View full text Add to dashboard Cite

show abstract

“…With compressive pressure, the shear force acts on the skin surface causing various stresses in the body which act to form pressure ulcers 1) . In order to investigate the relationship between compressive pressure and shear force, Sakuta et al 8) measured the changes in blood flow due to these loads.…”

Section: Discussionmentioning

confidence: 99%

“…Not only pressure force, but also shear force, acts on the skin surface (surface shear force) 1) . While the risk for pressure ulcer onset was once considered to be determined by "pressure × time", it is now thought to be regulated by "stress (pressure stress, shear stress and tensile stress) × time × frequency" 1) .…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2008

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Abstract.[Purpose] The purpose of the present study was to prepare an experimental model for estimating the shear force for a person sitting in a comfortable posture while leaning against a backrest, and then to verify its validity.[Subjects] The subjects were 16 healthy adult men without leg and trunk diseases (age: 21.6 ± 0.8 years; height: 172.5 ± 5.3 [cm]; and body weight: 63.4 ± 6.4 [kg]).[Methods] Using the model, the shear force applied to the gluteal region in a sitting posture was estimated, and at the same time, the shear force was measured using a force plate. The model's validity was assessed by comparing the estimated and measured values in terms of correlation coefficients.[Results] The average estimated shear force was 36.6 ± 11.8 [N], and the average reaction force in the posterior direction as part of the anteroposterior components of the floor reaction force (shear force in the anterior direction) was 35.9 ± 15.8 [N]. No significant difference existed (p=0.797), and the correlation coefficient was 0.897 (p<0.0001), thus exhibiting a strong positive correlation. [Conclusion] This result shows that the validity of the present experimental model is high, and the model is useful in clinical settings because shear force in a comfortable sitting posture can be relatively easily estimated without a special device.

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椅子上安楽座位におけるずれ力発生のメカニズム―座圧分布変位の時間的要素による検証―

et al. 2007

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ABSTRACT:The purpose of this study was to verify the initial mechanism of shear force in comfortable sitting position on chair. With 10 healthy men as subjects, we measured the displacement width of sitting pressure distribution with trunk backward inclining and the time difference from contact with the backrest until the beginning of the shift of the sitting pressure center position under two conditions of "with" and "without" backrest using a pressure distribution meter. The results show that the sitting pressure center position gradually moves backwards with trunk backward inclining, and in the case of "with" backrest turned forward just after the inclining (0.2 ± 0.1 sec). The displacement width was a shift forward from the base sitting position of 0.5 ± 1.2 cm "with" backrest and a shift backward of 2.0 ± 1.1 cm "without" backrest, showing a significant difference between them (p<0.01). These results suggest the intervention of backrest is indispensable in the initiation of shear force.

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Study of generation mechanism and prevention of pressure sore by share force

Cited by 5 publications

References 0 publications

The influence of the distance between the backrest of a chair and the position of the pelvis on the maximum pressure on the ischium and estimated shear force

The influence of the distance between the backrest of a chair and the position of the pelvis on the maximum pressure on the ischium and estimated shear force

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

椅子上安楽座位におけるずれ力発生のメカニズム―座圧分布変位の時間的要素による検証―

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