A Simulation of the Viscoelastic Behaviour of Heel Pad During Weight-Bearing Activities of Daily Living

Behforootan, Sara; Chatzistergos, Panagiotis; Chockalingam, Nachiappan; Naemi, Roozbeh

doi:10.1007/s10439-017-1918-1

Cited by 23 publications

(14 citation statements)

References 34 publications

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“…A bespoke indentation device was utilized to stimulate each ROI with the different samples and skin perfusion was measured before and immediately after stimulation (Figure ). More specifically, the indentation device stimulated, in separate tests, the rearfoot, midfoot, and forefoot regions of the right foot of the participants with 10 load/unload cycles . The loading/unloading rate was set at 20 mm/s to simulate walking .…”

Section: Methodsmentioning

confidence: 99%

Localized pressure stimulation using turf‐like structures can improve skin perfusion in the foot

et al. 2019

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Objective Improving perfusion under the skin can potentially reduce ulceration and amputation risk in people with diabetic foot. Localized pressure stimulation has been proven capable of improving skin perfusion in the scalp but its effectiveness for the foot has not been tested. In this study, localized pressure stimulation was realized using flexible turf‐like structures (TLS) with dense vertical fibers and their ability to increase perfusion was assessed. Methods The skin in the rearfoot, midfoot, and forefoot of nine healthy volunteers was stimulated using two TLS with different stiffness and one wound filler material that generated a uniform compression. Changes in perfusion were assessed using laser speckle. Results Mechanical stimulation significantly increased perfusion in the forefoot and midfoot areas with the TLS achieving higher and more long‐lasting increase compared to the wound filler. The stiffer of the two TLS appeared to be the most effective for the forefoot achieving a significant increase in perfusion that lasted for 25.5 seconds immediately after stimulation. Conclusion The results of this study indicate that localized pressure stimulation is more effective compared to uniform compression for improving skin perfusion in the healthy foot. Further research in people with diabetic foot disease is needed to verify the clinical value of the observed effect.

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Section: Methodsmentioning

confidence: 99%

Localized pressure stimulation using turf‐like structures can improve skin perfusion in the foot

et al. 2019

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“…In fact, the mechanical properties of viscoelastic materials are more complex, and therefore models are developed from the two basic models to describe the mechanical performance of viscoelastic materials [13,[26][27][28][29][30][31][32][33][34][35][36][37].…”

Section: Basic Viscoelastic Modelsmentioning

confidence: 99%

Study on the Viscoelastic Damage Properties of NEPE Solid Propellant with Different Cyclic Stress Ratios

Fang

Sha³

et al. 2022

Propellants Explo Pyrotec

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Viscoelastic damage properties of NEPE (Nitrate Ester Plasticized Polyether) solid propellant have been studied in this work. This work focuses on the creep and fatigue damage evolution. Cyclic loading tests for NEPE solid propellants are conducted with different stress ratios. Then a modified model incorporating viscoelasticity and damage evolution is presented and used to fit the experimental data. The fitting results show that the model is suitable to characterize the viscoelastic damage properties of NEPE propellants with different stress ratios. Based on the model with parameters for NEPE propellants, the damage parameter D are obtained. The damage evolution curves under different loading conditions are given. It is shown that, from the predicted damage evolution curves, the critical damage parameter Dcr at the fracture points can be used to predict the fatigue lives under different loading conditions.

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“…As a result, any loading will affect the tissue’s mechanical behaviour. Studies demonstrate that using a well-defined preconditioning protocol can minimise the effect of loading history to reveal underlying clinically relevant changes in tissue biomechanics 11 , 12 .…”

Section: Introductionmentioning

confidence: 99%

An in vivo model for overloading-induced soft tissue injury

Chatzistergos

Chockalingam

2022

Sci Rep

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This proof-of-concept study demonstrates that repetitive loading to the pain threshold can safely recreate overloading-induced soft tissue damage and that localised tissue stiffening can be a potential marker for injury. This concept was demonstrated here for the soft tissue of the sole of the foot where it was found that repeated loading to the pain threshold led to long-lasting statistically significant stiffening in the overloaded areas. Loading at lower magnitudes did not have the same effect. This method can shed new light on the aetiology of overloading injury in the foot to improve the management of conditions such as diabetic foot ulceration and heel pain syndrome. Moreover, the link between overloading and tissue stiffening, which was demonstrated here for the first time for the plantar soft tissue, opens the way for an assessment of overloading thresholds that is not based on the subjective measurement of pain thresholds.

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A Simulation of the Viscoelastic Behaviour of Heel Pad During Weight-Bearing Activities of Daily Living

Cited by 23 publications

References 34 publications

Localized pressure stimulation using turf‐like structures can improve skin perfusion in the foot

Localized pressure stimulation using turf‐like structures can improve skin perfusion in the foot

Study on the Viscoelastic Damage Properties of NEPE Solid Propellant with Different Cyclic Stress Ratios

An in vivo model for overloading-induced soft tissue injury

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