Abstract.The upper limbs plays a key role in the performance of ADL, from support to total execution. However, Often rehabilitations therapies sacrifices the regaining of functionality to other functions as transportation. Therefore an automatic system capable of recognize ADL based on the information provided by upper limbs is needed. Lots of algorithms have been reported using inertial sensors with limited results. The aim of this work is to describe an algorithm to recognize some ADL performed with the upper limb, such as eating, drinking, talking by phone, combing hair and brushing teeth. The algorithm is based on an alternative novel sensor that provides information of the vertical displacement of the wrist relative to the shoulder, and can be used in a free-living environment. The detection system combines decision trees (DT) and Hidden Markov Models (HMM). Efficiencies reported goes from 61% up to 100%.
We need studies of better methodological quality to establish the Parkinson's disease stage in which auditory cues are most beneficial, as well as to determine the most effective type and frequency of the auditory cue during gait initiation and turning in patients with Parkinson's disease.
Abstract-Feeding and drinking are Activities of Daily Living which can be used to assess the motor control and functional ability of the upper limb. This paper presents the upperlimb kinematics during the execution of feeding and drinking activities, such analysis consisted in the measurement of angles of flexion for trunk and arm. Eight healthy subjects performed these activities in a simulated-environment while they were video recorded. Markers on anatomical landmarks were used to analyze the kinematics of the upper limb in the sagittal plane. Additionally an electro-hydraulic sensor was attached to each upper limb to assess the vertical position of the wrist relative to the shoulder. Results showed a difference on the angles of the elbow and trunk. The electro-hydraulic sensor showed to be an efficient way to record the vertical position of wrist.
Abstract-Ankle movements are complex and play a key role in displacement and manipulation of equipment. This paper presents a novel game-based device to assess the ankle movements. The system is composed by a hemisphere, a smartphone, a software application for the smartphone and another one for the computer. The hemisphere acts as the main interface between the foot and the software application. Through the hemisphere, which acts as a pointer or jositick for the foot, the user guides a pointer through a hexagonal trajectory. This allows assessing the ankle movements. The developed system was tested with 11 subjects. Preliminary result shows the potential of the system.
Activities of Daily Living (ADL) have a background of selfsufficiency and survival function. Upper limbs participate actively in many ADL; particularly, activities related to feeding, communication, and grooming. The performance of such activities is a parameter of independence. Various researchers have studied ADL in a free-living environment by using inertial sensors. However, functional-activity recognition with low recognition rate is a persistent result. This work proposes the use of well-known clustering techniques for ADL recognition by using as feeding signal the vertical trajectory of wrist relative to the shoulder.
Abstract-In the area of Biomedical Instrumentation and Physiology, the teaching process is commonly supported by commercial instrumentation systems, frequently used with minimal understanding of the fundamental principles of registering and processing physiological signals. In BME-closing module at Faculty of Engineering, National Autonomous University of Mexico, the Fundamentals of Biomedical Instrumentation and Introduction to Physiology courses, are in need to put in practice theoretical subjects, using accessible equipment. Therefore, an instrument to register and display ECG signals was developed for educational purpose, training students in topics such as: identify main problems when acquiring biosignals, basic medical electronics, designing customized instrumentation systems and biosignal processing. Development was conducted using free licensed software such as IDE Arduino for hardware controller and, Phyton, Processing and Octave for signal display and processing data, making accessible the use of this platform in both courses. Theoretical and practical knowledge obtained will allow students to continue his/her career as designer/developer of instrumentation systems -hardware and software-for research, as well as in medical equipment maintenance.
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