Wyniki wyszukiwania - BazTech

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Balance control via tactile biofeedback in children with cerebral palsy

Argunsah Hande, Yalcin Begum

Acta of Bioengineering and Biomechanics

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2023

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Vol. 25, no. 1

161--171

EN

Children with cerebral palsy have limitations in utilizing neural information to perform smooth movement and maintain balance during walking. This study aimed to develop a wearable sensor that tracks balance continuously and provides haptic biofeedback to its user through real-time vibration stimulus to assist patients with balance and postural control impairments such as cerebral palsy. Methods: Twelve children with cerebral palsy and 12 age-matched typically developed children used the sensor during walking at a self- -selected speed. The lower extremity joint kinematics, center of mass, and spatial-temporal parameters were recorded with Xsens MVN during “with” and “without” biofeedback conditions. Results: The sensor did not disturb healthy gait. Pearson correlation coefficient and Root Mean Square Error techniques showed that biofeedback regulated the gait parameters and trunk stability of the CP group. The extended stance percentage (without BF: 73.91% ± 10.42, with BF: 63.53% ± 2.99), step width (without BF: 0.20 m ± 0.05, with BF: 0.18 m ± 0.07), and step time (without BF: 1.55 s ± 1.07, with BF: 0.73 s ± 0.14) parameters decreased. Similarly, cadence and walking speed increased. Conclusions: Obtained results indicated that this wearable sensor can be integrated into the physical therapy and rehabilitation process of children with balance and postural control impairments to improve motor learning and balance control. The present findings contribute to a better understanding of the adaptation of innovative engineering applications with rehabilitation processes, which, in turn, could assist patients with balance impairments and facilitate their integration into society.

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Characterization of muscle fatigue in the lower limb by sEMG and angular position using the WFD protocol

Chaparro-Cárdenas Silvia L., Castillo-Castañeda Eduardo, Lozano-Guzmán Alejandro A., Zequera Martha, Gallegos-Torres Ruth Magdalena, Ramirez-Bautista Julian Andres

Biocybernetics and Biomedical Engineering

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2021

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Vol. 41, no. 3

933--943

EN

Lower limb muscle fatigue has been evaluated in previous studies to understand painrelated movement variability by analyzing different muscles using surface electromyography (sEMG) and angular position signals; however, further studies are needed to particularly understand strength loss due to gait and to inform the development of intelligent control systems for rehabilitation devices in the prevention and management of musculoskeletal or balance control disorders in the Latin American population. A pilot study was developed to characterize muscle fatigue using a walking fatigue detection (WFD) protocol, an instrumented orthosis and a treadmill. Electrical activity was acquired from Rectus Femoris (RF), Biceps Femoris (BF), Tibialis Anterior (TA) and Gastrocnemius Lateralis (GL) muscles, as well as the angular position of the hip and knee of sixteen healthy Latin-American women, aged 22–34 years, 63.5 ± 6 kg mass, and 161 ± 7 cm height. Data were analyzed with a one-way ANOVA analysis of variance and Tukey’s test. Preliminary results show that muscle fatigue is clearly identifiable and is represented by a decrease in both amplitude and frequency of the sEMG signal and lower limb angular position. Muscle fatigue was evident in 93.75% of the participants at the end of the test. 75% of the participants experienced muscle fatigue halfway through the test, of which 31.35% were unable to regain strength causing more muscles to fatigue, due to the extra effort they were enduring it was also found that when one muscle goes into fatigue, another muscle supports the action observing muscle compensation but without a uniform pattern.

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Design and development of an intelligent biomechatronic tumor prosthesis

Kocaoglu Sitki, Akdogan Erhan

Biocybernetics and Biomedical Engineering

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2019

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Vol. 39, no. 2

561--570

EN

Nowadays, bone cancer patients using expandable prostheses (EPs) have to go to the clinic frequently to determine the limb length and to perform the extension if necessary, as long as their age-based growth lasts. This situation brings along problems such as increased physician workload, the patient's exposure to radiation at each measurement, a larger rate of extension due to the long interval period between each extension and thus reducing patient comfort as well as making the daily life of the patient difficult. In this study, a biomechatronic tumor prosthesis which is able to determine the need for extension by means of its hardware and intelligent control structure was developed to eliminate the aforementioned problems. Mechanical analysis of the designed prosthesis has been performed in the simulation environment, the prototype of the prosthesis has been produced, wireless communication and control system have been created and the performance of the system has been tested on the experimental setup. Limb length discrepancies (LLDs) of 1 mm and above between the healthy limb and the limb with a prosthesis were able to be detected by the system, and prosthesis extension procedure was successfully performed against the maximum soft tissue resistance to be possibly encountered.

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Textile Sweat Sensor for Underwear Convenience Measurement

Kubiak P., Leśnikowski J., Gniotek K.

Fibres & Textiles in Eastern Europe

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2016

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Vol. 24, no. 6 (120)

151--155

EN

The following article is aimed at researching textile-based simplified sensors to determine the human perspiration effect and sweat appearance on the body and wearing surface. Using the current flow and resistance drop effect over cotton and polyester - based textile sensors, it is possible to detect sweat appearance on their surface. The article presents how to conduct a new , low cost, textile sweat sensor designed especially for healthy persons. The sensors proposed are designed to detect the presence of sweat and not for precise measurements of sweat properties. The sensors proposed are of the resistive type, therefore the presence of perspiration causes a change in its resistance. The main novelty of the sensor proposed is that it is based only on textile materials. Additionally examples of resistance measurements of the sensors proposed are presented. The results of research on the influence of the substrate on the properties of the sensors proposed are also described.

PL

W artykule przedstawiono sposób wykonania prostego czujnika tekstylnego przeznaczonego do wykrywania obecności potu na powierzchni ciała człowieka. Proponowany czujnik korzystając ze zjawiska wzrostu wartości prądu przepływającego przez podłoże tekstylne (zmniejszenia wartości rezystancji tego podłoża), umożliwia wykrycie obecności potu na jego powierzchni. Przedstawiony w artykule czujnik charakteryzuje się prostą budową, niskim kosztem wykonania oraz możliwością wykonania w każdej szwalni. Głównym, potencjalnym obszarem zastosowania proponowanego czujnika jest wykrywanie obecności potu u osób zdrowych w celu oceny komfortu pododzieżowego. W artykule przedstawiono również wyniki badań wpływu oddziaływania różnego rodzaju cieczy na rezystancję proponowanego czujnika. Opisano również wyniki badań nad przydatnością bawełny i poliestru, jako surowca, z którego jest wykonane podłoże czujnika.