Wavelet based correlation and coherence analysis reveals frequency dependent motor unit conduction velocity of the abductor pollicis brevis muscle.
Summary of "Wavelet based correlation and coherence analysis reveals frequency dependent motor unit conduction velocity of the abductor pollicis brevis muscle."
The purpose of this study was to investigate the motorunit conduction velocity (CV) as a function of frequency. A wavelet based correlation and coherence analysis was introduced to measure CV as a function of frequency. Based on the most simple assumption that the power spectra of the motor unit action potential is shifted to higher frequencies with increasing CV, we hypothesized that there would be a monotonic or linear trend of increasing CV with frequency. This trend was only confirmed at higher frequencies. At lower frequencies the trend was often reversed leading to a decrease in CV with increasing frequency. Thus the CV was high at low frequencies, went through a minimum at about 170Hz and increased at higher frequencies, as expected. The observed CV at low frequencies could not be fully explained by assuming non-propagating signals or variable groups of motor units. We concluded that spectra and CV contain partly independent information about the muscles and that the wavelet based method provides the tools to measure them both simultaneously.
Affiliation
Human Performance Laboratory, University of Calgary, Calgary, Alberta, Canada.
Journal Details
This article was published in the following journal.
Name: Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology
ISSN: 1873-5711
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20634091
- DOI: http://dx.doi.org/10.1016/j.jelekin.2010.06.004
Medical and Biotech [MESH] Definitions
Wavelet Analysis
Signal and data processing method that uses decomposition of wavelets to approximate, estimate, or compress signals with finite time and frequency domains. It represents a signal or data in terms of a fast decaying wavelet series from the original prototype wavelet, called the mother wavelet. This mathematical algorithm has been adopted widely in biomedical disciplines for data and signal processing in noise removal and audio/image compression (e.g., EEG and MRI).
Tomography, Optical Coherence
An imaging method using LASERS that is used for mapping subsurface structure. When a reflective site in the sample is at the same optical path length (coherence) as the reference mirror, the detector observes interference fringes.
Activation Analysis
A method of chemical analysis based on the detection of characteristic radionuclides following a nuclear bombardment. It is also known as radioactivity analysis. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Microscopy, Energy-filtering Transmission Electron
An analytical transmission electron microscopy method using an electron microscope fitted with an energy filtering lens. The method is based on the principle that some of the ELECTRONS passing through the specimen will lose energy when they ionize inner shell electrons of the atoms in the specimen. The amount of energy loss is dependent upon the element. Analysis of the energy loss spectrum (ELECTRON ENERGY-LOSS SPECTROSCOPY) reveals the elemental composition of a specimen. It is used analytically and quantitatively to determine which, how much of, and where specific ELEMENTS are in a sample. For example, it is used for elemental mapping of PHOSPHORUS to trace the strands of NUCLEIC ACIDS in nucleoprotein complexes.
Psychophysics
The science dealing with the correlation of the physical characteristics of a stimulus, e.g., frequency or intensity, with the response to the stimulus, in order to assess the psychologic factors involved in the relationship.
PubMed Articles
Wavelet Analysis Reveals Heterogeneous Time-dependent Oscillations of Individual Mitochondria.
Mitochondrial inner membrane potential oscillators in cardiac myocytes synchronize under oxidative or metabolic stress leading to synchronized whole-cell oscillations. Gaining information about the sp...
Classification of sleep apnea types using wavelet packet analysis of short-term ECG signals.
OBJECTIVE: Obstructive sleep apnea (OSA) causes a pause in airflow with reduced breathing effort. In contrast, central sleep apnea (CSA) event is not accompanied with breathing e...
We apply wavelet-based time-localized phase coherence to investigate the relationship between blood flow and skin temperature, and between blood flow and instantaneous heart rate (IHR), during vasocon...
ERG signal analysis using wavelet transform.
The wavelet analysis is a powerful tool for analyzing and detecting features of signals characterized by time-dependent statistical properties, as biomedical signals. The identification and the analys...
Time-frequency analysis of heart rate variability (HRV) provides relevant clinical information. However, time-frequency analysis is very sensitive to artefacts. Artefacts that are present in heart rat...
Clinical Trials
Wavelet Analysis of Electromyography (EMG) in Cerebral Palsy
Several methods exist to evaluate motor function in the child with cerebral palsy and are used to assess the outcome of a clinical intervention. However, these scales are not directed towa...
Retinal Thickness Analysis Using Optical Coherence Tomography
The main objective of this study is to characterize and correlate diabetic macular edema (DME), i.e. increased retinal thickness, measured by Optical Coherence Tomograph (OCT), and retinal...
The Study of Human Atherosclerosis by Polarization-Sensitive Optical Coherence Tomography
Atherosclerosis is unquestionably the leading cause of morbidity and mortality in developed countries, and the world-wide importance of acute vascular syndromes is increasing. Rupture of a...
The activation of the knee extensors in adults after patella dislocation. The kneecap can dislocate due to an accident or also only due to an interior turn in the stretched knee joint out...
Optical Coherence Tomography Evaluation of a Biodegradable Polymer-based Drug-eluting Stent
PONTINA aims at assessing by optical coherence tomography the neointimal coverage of the biodegradable polymer-based Biolimus A9-eluting stent (Biomatrix stent) after full drug elution and...
