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Jayaraman Chandrasekaran Embry Kyle R. Mummidisetty Chaithanya K. Moon Yaejin Giffhorn Matt Prokup Sara Lim Bokman Lee Jusuk Lee Younbaek Lee Minhyung Jayaraman Arun 《Journal of neuroengineering and rehabilitation》2022,19(1):1-13
Numerous studies showed that postural balance improves through light touch on a stable surface highlighting the importance of haptic information, seemingly downplaying the mechanical contributions of the support. The present study examined the mechanical effects of canes for assisting balance in healthy individuals challenged by standing on a beam. Sixteen participants supported themselves with two canes, one in each hand, and applied minimal, preferred, or maximum force onto the canes. They positioned the canes in the frontal plane or in a tripod configuration. Statistical analysis used a linear mixed model to evaluate the effects on the center of pressure and the center of mass. The canes significantly reduced the variability of the center of pressure and the center of mass to the same level as when standing on the ground. Increasing the exerted force beyond the preferred level yielded no further benefits, although in the preferred force condition, participants exploited the altered mechanics by resting their arms on the canes. The tripod configuration allowed for larger variability of the center of pressure in the task-irrelevant anterior–posterior dimension. High forces had a destabilizing effect on the canes: the displacement of the hand on the cane handle increased with the force. Given this static instability, these results show that using canes can provide not only mechanical benefits but also challenges. From a control perspective, effort can be reduced by resting the arms on the canes and by channeling noise in the task-irrelevant dimensions. However, larger forces exerted onto the canes can also have destabilizing effects and the instability of the canes needs to be counteracted, possibly by arm and shoulder stiffness. Insights into the variety of mechanical effects is important for the design of canes and the instructions of how to use them. 相似文献
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Heinrich Giffhorn 《Virchows Archiv : an international journal of pathology》1908,192(1):112-126
Ohne ZusammenfassungHierzu 4 Abbildungen im Text und Taf. IV. 相似文献
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H K?stering J Giffhorn B Negendank-Damenz 《Infusionstherapie und klinische Ern?hrung》1985,12(6):304-307
The present study reports on an investigation of 32 normal subjects who were given intravenously 500 ml of hydroxyethyl starch (HES) over 30 min. In 16 normal subjects, 500 ml of blood had been previously withdrawn over 20 min. Tolerance proved to be good. Side effects such as hyperergic reactions, influence on circulatory or cardiac function were not observed. Changes in corpuscular elements of blood did not exceed the dilution effect and mostly returned to the initial value 60 min after termination of HES infusion. The change in thrombocyte function, immunoglobulins and the inhibitors alpha 1-antitrypsin, alpha 2-macroglobulin, as well as C1-inactivator and C3-activator only slightly, but not more pronounced than it could have been expected by the dilution effect. A favorable effect could be recorded in erythrocyte filtration according to Schmidt-Schoenbein. Here, we found an improved flow property which exceeded the hemodilution effect and lasted over the 4-hour test period. In addition, thrombocyte aggregation during ADP administration in the Born chamber did not show any change which suggests that a clinically relevant effect on thrombocyte function and thus the danger of hemorrhage during HES administration can be excluded. 相似文献
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Gustavo Alves Schaitza José Rocha Faria Neto Julio Cesar Francisco Cristiana Pellegrino Baena Helcio Giffhorn Bruna Olandoski Leanderson Franco de Meira Luiz César Guarita-Souza 《Brazilian Journal Of Cardiovascular Surgery》2014,29(4):663-666
An aneurysm of the left ventricle is a complication of acute myocardial infarction.
We report a case of a giant aneurysm of the left ventricle after myocardial
infarction in a 59 year-old male patient. The surgery to correct the aneurysm was
performed with the use of cardiopulmonary bypass under normothermia. A bovine
pericardial patch was used for the geometric reconstruction of the ventricular wall
affected by the aneurysm. After the procedure, echocardiography and magnetic
resonance imaging revealed improvement in left ventricular ejection fraction and
volume reduction. 相似文献
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