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Engineering in Medicine and Biology Magazine, IEEE

Issue 6 • Date Nov.-Dec. 2001

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Displaying Results 1 - 23 of 23
  • From the guest editor - recent advancements in the analysis of dynamic EMG data

    Publication Year: 2001 , Page(s): 29 - 32
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (127 KB) |  | HTML iconHTML  

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  • Effect of joint angle on EMG variables in leg and thigh muscles

    Publication Year: 2001 , Page(s): 62 - 71
    Cited by:  Papers (60)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2535 KB) |  | HTML iconHTML  

    It is the purpose of this article (a) to show the influence of electrode location on EMG amplitude and spectral variables for simulated and real signals for different muscles of the thigh and leg, (b) to investigate the relative movement of the muscle under the recording electrodes when the joint angle changes for the set of muscles most frequently investigated in gait analysis, and (c) to illustrate how different electrode locations may lead to different interpretations of the muscle activity investigated with amplitude and spectral analysis of the surface EMG signal. The study has been carried out on the following muscles of the leg and thigh: rectus femoris, vastus lateralis, vastus medialis, biceps femoris, semitendinosus, tibialis anterior, gastrocnemius lateralis, and gastrocnemius medialis. View full abstract»

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  • Assessing fatigue with electromyographic spike parameters

    Publication Year: 2001 , Page(s): 90 - 96
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (8927 KB) |  | HTML iconHTML  

    This study demonstrated a high degree of equivalence between SEMG spike parameters and traditional time and frequency measures. The findings described in this article are important for patients who are unable to maintain constant-force contractions. The SEMG signal is stationary for constant-force contractions which is a necessary condition that must be met before applying spectral analysis techniques. However, before SEMG spike analysis can be advanced to regular clinical use, its limitations must be further understood. View full abstract»

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  • Analyzing surface myoelectric signals recorded during isokinetic contractions

    Publication Year: 2001 , Page(s): 97 - 105
    Cited by:  Papers (23)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (14358 KB) |  | HTML iconHTML  

    A time-frequency approach using wavelets to study movements at different angular velocities is considered. The authors summarized the application of the continuous wavelet transform (CWT) to the analysis of the surface myoelectric (ME) signal. The present technique of determining MNF has the advantage that it is possible to determine the frequency content of the ME signal during short and nonstationary contractions. In addition, the CWT method is very reliable for the analysis of nonstationary biological signals and does not require any smoothing function as do methods based on Wigner-Ville. However, using time-frequency methods involves two main tradeoffs: i.e., potential increases in performance for a given application versus computational complexity and storage requirements. Our results confirmed earlier studies that MNF is independent of angular velocity. View full abstract»

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  • Time-frequency analysis of surface myoelectric signals during athletic movement

    Publication Year: 2001 , Page(s): 106 - 115
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (13305 KB) |  | HTML iconHTML  

    Considers muscle activation and fatigue during propulsion of a racing wheelchair. The authors discuss a single case study on the modality of muscle activation during the propulsion of a racing wheelchair. To investigate muscle coordination, muscle fatigue, and the strategies that the subject exploits to counteract the effects of muscle fatigue and keep a high level of performance, the authors first studied the activation intervals of seven trunk and upper limb muscles and then studied the evolution in time of their spectral content by means of two different approaches, according to the statistical properties of their myoelectric signals. Angle, angular velocity, and angular acceleration of the elbow joint have also been considered. This combined approach allowed the authors to obtain different results important to gaining a deeper insight in the differences among the observed muscles in this specific exercise. View full abstract»

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  • Providing appropriate exercise levels for the elderly

    Publication Year: 2001 , Page(s): 116 - 124
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (8638 KB) |  | HTML iconHTML  

    We propose a unique fuzzy system design for adjusting the cycle ergometer work-load to each individual's physical work capacity. We observed the physical work capacity by measuring the heart rate and a muscular-fatigue-related index. A set of fuzzy membership functions was determined for three different phases during a trial of exercise with a progressively increasing workload. Since the available objective data was limited in describing changes in physical activities, the fuzzy rules for workload control were designed to reflect the different types and different time-scales of physical information. We examined 18 elderly people and periodically redesigned die fuzzy inference for eight selected persons over a seven-month period. View full abstract»

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  • Analyzing dynamic EMG and VMG signals of respiratory muscles

    Publication Year: 2001 , Page(s): 125 - 132
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (17642 KB) |  | HTML iconHTML  

    A promising technique is described for evaluating ventilatory disease by studying activity and fatigue in the sternocleidomastoid muscle. We analyze dynamic muscular function in time and frequency domains during two respiratory load tests at different levels of ventilation. View full abstract»

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  • EMG-based measures of fatigue during a repetitive squat exercise

    Publication Year: 2001 , Page(s): 133 - 143
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2352 KB) |  | HTML iconHTML  

    We have demonstrated a technique to calculate the EMG instantaneous median frequency to assess muscle fatigue during a dynamic exercise commonly prescribed in patients with ACL deficiency. We used Cohen-Posch time-frequency representations to improve upon the variability of the instantaneous median frequency estimates derived using Cohen Class transformations. The technique was applied to surface EMG data recorded from the quadriceps and hamstring muscles of a control subject and a patient with ACL deficiency during a repetitive squat exercise. Instantaneous median frequency values were derived for the knee-extension phases of the exercise. Ensemble average and standard deviation of the instantaneous median frequency were computed for the portion of the cycle associated with the lowest variability of the mechanics. View full abstract»

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  • Heterogeneous integration through electrokinetic migration

    Publication Year: 2001 , Page(s): 144 - 151
    Cited by:  Papers (2)  |  Patents (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3055 KB) |  | HTML iconHTML  

    We apply basic electrophoretic motion to semiconductor materials engineering for development of the next level of heterogeneous integration technology. Furthermore, we demonstrate the utility of these tools in integration of inorganic devices with biological species in order to explore the utility of these tools in biotechnological applications.Electrical and optical addressing techniques are shown to allow for more rapid and parallel patterning of biological species and inorganic objects. View full abstract»

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  • Compression of color skin tumor images with vector quantization

    Publication Year: 2001 , Page(s): 152 - 164
    Cited by:  Papers (3)
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    Performing compression in DWT and DCT domains is shown to reduce storage space and transmissions cost of digital images. View full abstract»

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  • Antenatal fetal risk assessment using a neurofuzzy technique

    Publication Year: 2001 , Page(s): 165 - 169
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (461 KB) |  | HTML iconHTML  

    This study defines an intelligent neurofuzzy system for antepartum fetal evaluation, The task is to investigate the Doppler ultrasound measurements of the umbilical artery (UA) and the cerebral artery (CA) to relate the health conditions of fetuses. We thus use the UA blood flow velocity waveforms [pulsality index, resistance index, and systolic/diastolic ratio] and the ratios of cerebral-umbilical resistance indices in terms of weeks. We then make a decision on the basis of a fuzzy-rule-based system combined with data-based learning strategies such as a radial basis function network and a multilayer perceptron for assessing the hypoxia suspicion. A fuzzy grade of membership is used for the evaluation of the seriousness of the situation of the fetus, and the diagnostic interpretations for doctors such as good, suspicious, and alarming conditions of fetus are derived. View full abstract»

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  • Analyzing blood cell concentration as a stochastic process

    Publication Year: 2001 , Page(s): 170 - 175
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (217 KB) |  | HTML iconHTML  

    The hemogram is a prime index of evolution and prognosis of a variety of severe pathological disorders. The concentration of circulating blood elements, taken as a parameter of the system dynamics, displays a remarkable temporal variability. This variability can be considered as the integrated result of all the multiple interactions involved in controlling processes of generation, lifetime, and remotion of circulating cells. Designing a model able to satisfactorily predict the evolution (i.e., range of future values) of a hemogram series would be of high medical relevance. This article reports on basic characteristics of normal hemogram variability, analyzed as a stochastic process, within the framework of a mathematically defined theoretical model, the fractional Brownian motion. These results are compared with those obtained by standard spectral analysis: the autocorrelation function and its Fourier transform. Time series corresponding to day-to-day records of the circulating blood cells concentration obtained from two healthy sheep over a period of 1024 days were used. View full abstract»

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  • Determining flexor-tendon repair techniques via soft computing

    Publication Year: 2001 , Page(s): 176 - 183
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (187 KB) |  | HTML iconHTML  

    This article describes a multi-objective techniques, of identifying the best options among a suite of factors that influence the successful outcome of flexor-tendon repair. Our article begins with fuzzy-set development and relevant fuzzy-logic operations. Next, we consider multi-objective decision making with fuzzy logic, followed by the inclusion of core suture technique complexity and preference variations as decision considerations. Results are presented followed by a comparison and contrast of the soft-computing-based multi-objective decision making and Taguchi methods. View full abstract»

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  • Errata "a unified time-frequency parametrization of EEGs"

    Publication Year: 2001 , Page(s): 188
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  • Biomechanical systems: techniques and applications, volume 1: computer techniques and computational methods in biomechanics [Book Review]

    Publication Year: 2001 , Page(s): 193
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    Freely Available from IEEE
  • Author Index

    Publication Year: 2001 , Page(s): 199 - 202
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    Freely Available from IEEE
  • Subject index

    Publication Year: 2001 , Page(s): 202 - 212
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    Freely Available from IEEE
  • Generalizability of trunk muscle EMG and spinal forces

    Publication Year: 2001 , Page(s): 72 - 81
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (179 KB) |  | HTML iconHTML  

    The use of surface electromyography (EMG) has been a great tool for understanding various aspects of muscle physiology and pathology in the areas of basic and clinical science. Although the properties of the surface EMG signal obtained during isometric conditions have been well defined in the exhaustive body of research, there is much to learn about the nature of EMG recorded during variable-length muscle exertions. Several papers have explored the analysis of surface EMG obtained during fatiguing exertions using recently developed methods of signal processing, including wavelet and time-frequency analysis. In addition to utilizing surface EMG as an indicator of fatigue, researchers are using the measurement of surface EMG to predict muscle and joint forces. The objective of this article is to examine the reproducibility of trunk muscle surface EMG and estimated L3/L4 disc forces obtained during isokinetic trunk extension.Identifying sources of variability during dynamic trunk extension that affect measurement of EMG and disk forces View full abstract»

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  • Influences of dynamic factors on myoelectric parameters

    Publication Year: 2001 , Page(s): 82 - 89
    Cited by:  Papers (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (202 KB) |  | HTML iconHTML  

    We present a compilation of results from previous studies and preliminary results from a new study all conducted by the authors describing the influences of joint angle and muscle force on two myoelectric parameters-conduction velocity and the mean frequency (MF) of the power spectrum. Also described is an estimation technique that significantly diminishes the effects on MF estimation during dynamic muscle contractions View full abstract»

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  • Estimation and application of EMG amplitude during dynamic contractions

    Publication Year: 2001 , Page(s): 47 - 54
    Cited by:  Papers (24)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (312 KB) |  | HTML iconHTML  

    Processing nonstationary EMG signals for applications in prosthesis control, biofeedback, and joint torque estimation, is discussed View full abstract»

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  • Improving detection of muscle activation intervals

    Publication Year: 2001 , Page(s): 38 - 46
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3307 KB) |  | HTML iconHTML  

    In this article the characteristics of traditional and novel algorithms for the detection of the onset (and offset) of muscle contraction using EMG signals have been briefly summarized. As is evident from these descriptions, many studies have been carried out in the last few years in order to improve the accuracy of the detection and to make the performance of the algorithm less dependent on the skill of the operator View full abstract»

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  • Extraction of the envelope from surface EMG signals

    Publication Year: 2001 , Page(s): 55 - 61
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1822 KB) |  | HTML iconHTML  

    Electrical signals recorded by means of surface electromyography (SEMG) contain some useful information for a better understanding of strategies underlying human movement. In particular, a great contribution to biomechanic studies may be provided by a correct estimation of the amplitude of SEMG signals that is related to the force exerted by muscles. This information could, in fact, represent an indirect assessment of muscular force obtained without using invasive measurement techniques. This article presents a new fully automatic estimation technique adaptively working on SEMG signal characteristics. The discussion of the theoretical background of the estimator together with a feasibility study demonstrates the usefulness of its application. An example of the application to signals recorded during dynamic protocols is also shown View full abstract»

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  • Clinician's view: dynamic EMG

    Publication Year: 2001 , Page(s): 33 - 37
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (77 KB)  

    The research into a correlation between joint biomechanics and the action of muscles that act on the limb segment involved during movement has become very important in recent years. However, while the techniques for elaborating the EMG signal and its relationship with the dynamics of movement are described in detail in the literature, from a clinical point of view publications on how these techniques are used for clinical gait analysis applications are scarce. The purpose of dynamic EMG in clinical gait analysis is essentially to define the muscular activity that controls joint movement during gait, as shown by studies carried out on children with cerebral palsy, in which the abnormal pattern of muscle activation is used, for example, as an indication for surgical tendon transfer or lengthening View full abstract»

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IEEE Engineering in Medicine and Biology Magazine contains articles on current technologies and methods used in biomedical and clinical engineering.

 

This Magazine ceased publication in 2010. The current retitled publication is IEEE Pulse.

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