Lumbar muscle electromyographic dynamic topography during flexion-extension
| Autor: | Keith D. K. Luk, Stanley H.F. Siu, Yong Hu, Joseph N F Mak |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Male
musculoskeletal diseases Movement Biophysics Neuroscience (miscellaneous) Lumbar vertebrae Electromyography Root mean square Lumbar Task Performance and Analysis medicine Humans Muscle Skeletal Mathematics Back Lumbar Vertebrae medicine.diagnostic_test Anatomy Middle Aged Intensity (physics) Motor coordination Ocean surface topography medicine.anatomical_structure Chronic Disease Neurology (clinical) medicine.symptom Low Back Pain Muscle Contraction Biomedical engineering Muscle contraction |
| Zdroj: | Journal of Electromyography and Kinesiology. 20:246-255 |
| ISSN: | 1050-6411 |
| DOI: | 10.1016/j.jelekin.2009.05.002 |
| Popis: | The objective of this study is to introduce dynamic topography of surface electromyography (SEMG) to visualize lumbar muscle myoelectric activity and provides a new view to analyze muscle activity in vivo. A total of 20 healthy male subjects and 15 males LBP were enrolled. An electrode-array was applied to the lumbar region to collect SEMG. The root mean square (RMS) value was calculated for each channel, and then a 160x120 matrix was constructed using a linear cubic spline interpolation of each scan to create a 2-D color topographic image. Along a definite interval of action, a series of RMS topography matrices was concatenated as a function of position and time, to form a dynamic topographical video of lumbar muscle activity. Relative area (RA), relative width (RW), relative height (RH) and Width-to-Height Ratio (W/H) were chosen as the four quantitative parameters in measuring topographic features. Normal RMS dynamic topography was found to have a consistent, symmetric pattern with a high intensity area in the paraspinal area. LBP patients had a different RMS dynamic topography, with an asymmetric, broad, or disorganized distribution. Quantitative SEMG features were found significantly different between normal control and LBP. After physiotherapy rehabilitation, the dynamic topography images of LBP tended towards the normal pattern. There are obvious differences in lumbar muscle coordination between healthy subjects and LBP patients. The dynamic topography allows the continuous visualization of the distribution of surface EMG signals and the coordination of muscular contractions. |
| Databáze: | OpenAIRE |
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