The Experts below are selected from a list of 26193 Experts worldwide ranked by ideXlab platform
Elisabeth Olsson - One of the best experts on this subject based on the ideXlab platform.
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coordinated ground forces exerted by Buttocks and feet are adequately programmed for weight transfer during sit to stand
Journal of Neurophysiology, 1999Co-Authors: Helga Hirschfeld, Maria Thorsteinsdottir, Elisabeth OlssonAbstract:The purpose of this study was to test the hypothesis whether weight transfer during sit-to-stand (STS) is the result of coordinated ground forces exerted by Buttocks and feet before seat-off. Whole...
Kikuo Tsuchiya - One of the best experts on this subject based on the ideXlab platform.
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subcutaneous nodules on the Buttocks as a manifestation of dialysis related amyloidosis a clinicopathological entity
British Journal of Dermatology, 2003Co-Authors: Satoko Shimizu, Chikako Yasui, Kana Yasukawa, Hiroyuki Nakamura, Hiroshi Shimizu, Kikuo TsuchiyaAbstract:Summary While β2-microglobulin amyloidosis occurring in patients undergoing long-term dialysis is frequently associated with joint involvement, skin lesions have rarely been encountered. We report a 57-year-old man with extensive subcutaneous amyloid deposition forming large nodules on the Buttocks; the patient had been on maintenance dialysis for 28 years. Although this condition is rare, a review of the literature indicates that the majority of such lesions occur around the buttock region.
Maria Thorsteinsdottir - One of the best experts on this subject based on the ideXlab platform.
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coordinated ground forces exerted by Buttocks and feet are adequately programmed for weight transfer during sit to stand
Journal of Neurophysiology, 1999Co-Authors: Helga Hirschfeld, Maria Thorsteinsdottir, Elisabeth OlssonAbstract:The purpose of this study was to test the hypothesis whether weight transfer during sit-to-stand (STS) is the result of coordinated ground forces exerted by Buttocks and feet before seat-off. Whole...
D.m. Brienza - One of the best experts on this subject based on the ideXlab platform.
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A method for custom-contoured cushion design using interface pressure measurements
IEEE Transactions on Rehabilitation Engineering, 1999Co-Authors: D.m. Brienza, P.e. KargAbstract:The interface pressure distributions between flat foam cushions and the Buttocks of seated test subjects were compared to custom-contoured cushion surface shapes generated with a seated-buttock contour gauge. The authors' hypothesis was that pressure measurements could be used to generate a contour equivalent to that obtained with a force-deflection contour gauge. The study was performed in a university medical center using spinal cord injured (SCI) (12) and elderly (30) test subjects. Interface pressure was measured using a pressure mapping pad. Contour shape was measured using an electronic force-deflection contour gauge. Pressure and contour information were reduced prior to analysis using singular value decomposition. Polynomial regressions were performed on the values in the first singular vectors of the corresponding pressure and contour decompositions. Relationships best described by cubic polynomials were detected between pressure and contour shape suggesting that interface pressure predicts optimal contour shape.
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A system for the analysis of seat support surfaces using surface shape control and simultaneous measurement of applied pressures
IEEE Transactions on Rehabilitation Engineering, 1996Co-Authors: D.m. Brienza, K.c. Chung, C.e. Brubaker, J. Wang, T.e. KangAbstract:A system for the design and analysis of seat support and buttock tissue interfaces has been developed. It has the ability to control the seating surface shape while measuring the pressure applied to the Buttocks by the surface. Pressures are measured over an 11/spl times/12 rectangular array of support elements using silicon pressure sensors mounted in a swiveling head atop each support element. Control of surface shape is mediated by selective linear translation of the support elements along their respective vertical axes. Closed-loop control of the system allows for the dynamic formulation of a support surface on the basis of programmable criteria. The system is intended to function as a research tool to facilitate the study of the relationships between support surface shape and interface pressure, and support surface shape and soft tissue distortion. The purpose of this paper is to present the system instrumentation and the rationale behind its design and development. The paper also presents the results of several tests to evaluate the accuracy and performance of the system. This evaluation included a pilot study on 10 able-bodied subjects. The results of these system evaluations indicate that the system is capable of making repeatable and precise measurements of pressure and surface element position and can formulate support surface shapes that satisfy specified optimization criteria.
Tamara Reid Bush - One of the best experts on this subject based on the ideXlab platform.
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initial estimation of the in vivo material properties of the seated human Buttocks and thighs
International Journal of Non-linear Mechanics, 2018Co-Authors: Zachary Sadler, Justin Scott, Joshua P Drost, Sara Roccabianca, Sheng Chen, Tamara Reid BushAbstract:Abstract On average, people are sedentary for 70% of the day, either seated or lying down. Of particular interest for this work is the seated posture; while seated the Buttocks and thigh tissues experience loading for prolonged periods of time. When modeling human body interactions with seating devices and in the design of these devices, it is necessary to appropriately model the material characteristics of the soft tissue in the thigh and buttock areas. Thus, there is a pressing need for in vivo, experimentally measured data that describe the mechanical behavior of the soft tissue within the Buttocks and thigh regions of humans in the seated posture. We developed an innovative experimental set-up to gather in vivo force–deflection data for both men and women in six regions located along the Buttocks and thighs. Then, using anatomical measures, cadaver measures, and reported literature on regional tissue thickness, the data were converted to normal stress and strain curves. Next, these curves were described using the Mooney–Rivlin material model. Finally, best-fit mechanical parameters were reported, along with the original force–deflection data. Results indicated that, in general, the male tissue differed from female tissue, and that the mechanical properties differed between regions. Thus, when developing computer models that represent the human body, different material properties should be considered for men and women. Furthermore, appropriate properties should be used for the body region being evaluated. These data are unique in that they are quantified in vivo, represent the seated body position, and include multiple regions for both men and women. The material properties presented in this work will lead to improved numerical models, and consequently improved device design.
