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Curved Microneedle Array-Based sEMG Electrode for Robust Long-Term Measurements and High Selectivity.

Kim M, Kim T, Kim DS, Chung WK - Sensors (Basel) (2015)

Bottom Line: However, conventional electrodes are not appropriate for long-term measurements and are easily influenced by the environment, so the range of applications of sEMG is limited.The results show that the proposed electrode is robust to perspiration and can maintain a high-quality measuring ability for over 8 h.The proposed electrode also has high selectivity for motion compared with a commercial wet electrode and dry electrode.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea. minjaekim@postech.ac.kr.

ABSTRACT
Surface electromyography is widely used in many fields to infer human intention. However, conventional electrodes are not appropriate for long-term measurements and are easily influenced by the environment, so the range of applications of sEMG is limited. In this paper, we propose a flexible band-integrated, curved microneedle array electrode for robust long-term measurements, high selectivity, and easy applicability. Signal quality, in terms of long-term usability and sensitivity to perspiration, was investigated. Its motion-discriminating performance was also evaluated. The results show that the proposed electrode is robust to perspiration and can maintain a high-quality measuring ability for over 8 h. The proposed electrode also has high selectivity for motion compared with a commercial wet electrode and dry electrode.

No MeSH data available.


Temporal changes in the baseline RMS amplitudes. Bars: ±1 SD, n = 5.
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f12-sensors-15-16265: Temporal changes in the baseline RMS amplitudes. Bars: ±1 SD, n = 5.

Mentions: After 2 h, the baseline RMS amplitude of the wet electrode decreased due to the electrolyte settling, because the wet electrode requires time to allow the electrolyte to diffuse. After that, the amplitude tended to increase as time passed due to drying of the electrolyte. Therefore, only data from 0 h, 2 h, and 8 h are described in Figure 12. In contrast, the MNA electrode and the dry electrode showed similar baseline RMS amplitudes, because both types of electrodes contact the skin with no medium. The results indicate that the temporal changes in signal quality were not significant for the MNA electrode and dry electrode (the p-values were 0.24 and 0.73 , respectively), while the wet electrode was affected considerably (p < 0.05).


Curved Microneedle Array-Based sEMG Electrode for Robust Long-Term Measurements and High Selectivity.

Kim M, Kim T, Kim DS, Chung WK - Sensors (Basel) (2015)

Temporal changes in the baseline RMS amplitudes. Bars: ±1 SD, n = 5.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541878&req=5

f12-sensors-15-16265: Temporal changes in the baseline RMS amplitudes. Bars: ±1 SD, n = 5.
Mentions: After 2 h, the baseline RMS amplitude of the wet electrode decreased due to the electrolyte settling, because the wet electrode requires time to allow the electrolyte to diffuse. After that, the amplitude tended to increase as time passed due to drying of the electrolyte. Therefore, only data from 0 h, 2 h, and 8 h are described in Figure 12. In contrast, the MNA electrode and the dry electrode showed similar baseline RMS amplitudes, because both types of electrodes contact the skin with no medium. The results indicate that the temporal changes in signal quality were not significant for the MNA electrode and dry electrode (the p-values were 0.24 and 0.73 , respectively), while the wet electrode was affected considerably (p < 0.05).

Bottom Line: However, conventional electrodes are not appropriate for long-term measurements and are easily influenced by the environment, so the range of applications of sEMG is limited.The results show that the proposed electrode is robust to perspiration and can maintain a high-quality measuring ability for over 8 h.The proposed electrode also has high selectivity for motion compared with a commercial wet electrode and dry electrode.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea. minjaekim@postech.ac.kr.

ABSTRACT
Surface electromyography is widely used in many fields to infer human intention. However, conventional electrodes are not appropriate for long-term measurements and are easily influenced by the environment, so the range of applications of sEMG is limited. In this paper, we propose a flexible band-integrated, curved microneedle array electrode for robust long-term measurements, high selectivity, and easy applicability. Signal quality, in terms of long-term usability and sensitivity to perspiration, was investigated. Its motion-discriminating performance was also evaluated. The results show that the proposed electrode is robust to perspiration and can maintain a high-quality measuring ability for over 8 h. The proposed electrode also has high selectivity for motion compared with a commercial wet electrode and dry electrode.

No MeSH data available.