NDLI: Study on the description method of upper limb’s muscle force levels during simulated in-orbit operations

Content Provider	Springer Nature Link
Author	Zhao, Yan Li, DongXu Liu, ZhiZhen Liu, Liang
Copyright Year	2013
Abstract	The dexterous upper limb serves as the most important tool for astronauts to implement in-orbit experiments and operations. This study developed a simulated weightlessness experiment and invented new measuring equipment to quantitatively evaluate the muscle ability of the upper limb. Isometric maximum voluntary contractions (MVCs) and surface electromyography (sEMG) signals of right-handed pushing at the three positions were measured for eleven subjects. In order to enhance the comprehensiveness and accuracy of muscle force assessment, the study focused on signal processing techniques. We applied a combination method, which consists of time-, frequency-, and bi-frequency-domain analyses. Time- and frequency-domain analyses estimated the root mean square (RMS) and median frequency (MDF) of sEMG signals, respectively. Higher order spectra (HOS) of bi-frequency domain evaluated the maximum bispectrum amplitude (B $_{max}$), Gaussianity level (S$_{g}$) and linearity level (S$_{ l }$) of sEMG signals. Results showed that B $_{max}$, S$_{ l }$, and RMS values all increased as force increased. MDF and S$_{g}$ values both declined as force increased. The research demonstrated that the combination method is superior to the conventional time- and frequency-domain analyses. The method not only described sEMG signal amplitude and power spectrum, but also deeper characterized phase coupling information and non-Gaussianity and non-linearity levels of sEMG, compared to two conventional analyses. The finding from the study can aid ergonomist to estimate astronaut muscle performance, so as to optimize in-orbit operation efficacy and minimize musculoskeletal injuries.
Starting Page	651
Ending Page	657
Page Count	7
File Format	PDF
ISSN	16747348
Journal	Science in China Series G
Volume Number	56
Issue Number	3
e-ISSN	18691927
Language	English
Publisher	SP Science China Press
Publisher Date	2013-02-13
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	astronaut sEMG MVC Bi-frequency domain time domain frequency domain Physics Classical Continuum Physics Astronomy, Observations and Techniques
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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