Spatial Reorganization of Myoelectric Activities in Extensor Digitorum for Sustained Finger Force Production
The study aims to explore the spatial distribution of multi-tendinous muscle modulated by central nervous system (CNS) during sustained contraction. Nine subjects were recruited to trace constant target forces with right index finger extension. Surface electromyography (sEMG) of extensor digitorum (...
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MDPI AG
2019-01-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/19/3/555 |
| _version_ | 1811304558580727808 |
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| author | Zhixian Gao Shangjie Tang Xiaoying Wu Qiang Fu Xingyu Fan Yun Zhao Lintao Hu Lin Chen Wensheng Hou |
| author_facet | Zhixian Gao Shangjie Tang Xiaoying Wu Qiang Fu Xingyu Fan Yun Zhao Lintao Hu Lin Chen Wensheng Hou |
| author_sort | Zhixian Gao |
| collection | DOAJ |
| description | The study aims to explore the spatial distribution of multi-tendinous muscle modulated by central nervous system (CNS) during sustained contraction. Nine subjects were recruited to trace constant target forces with right index finger extension. Surface electromyography (sEMG) of extensor digitorum (ED) were recorded with a 32-channel electrode array. Nine successive topographic maps (TM) were obtained. Pixel wise analysis was utilized to extract subtracted topographic maps (STM), which exhibited inhomogeneous distribution. STMs were characterized into hot, warm, and cool regions corresponding to higher, moderate, and lower change ranges, respectively. The relative normalized area (normalized to the first phase) of these regions demonstrated different changing trends as rising, plateauing, and falling over time, respectively. Moreover, the duration of these trends were found to be affected by force level. The rising/falling periods were longer at lower force levels, while the plateau can be achieved from the initial phase for higher force output (45% maximal voluntary contraction). The results suggested muscle activity reorganization in ED plays a role to maintain sustained contraction. Furthermore, the decreased dynamical regulation ability to spatial reorganization may be prone to induce fatigue. This finding implied that spatial reorganization of muscle activity as a regulation mechanism contribute to maintain constant force production. |
| first_indexed | 2024-04-13T08:09:14Z |
| format | Article |
| id | doaj.art-a6952e6658df4dd9afd9902773c7108a |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-13T08:09:14Z |
| publishDate | 2019-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-a6952e6658df4dd9afd9902773c7108a2022-12-22T02:55:04ZengMDPI AGSensors1424-82202019-01-0119355510.3390/s19030555s19030555Spatial Reorganization of Myoelectric Activities in Extensor Digitorum for Sustained Finger Force ProductionZhixian Gao0Shangjie Tang1Xiaoying Wu2Qiang Fu3Xingyu Fan4Yun Zhao5Lintao Hu6Lin Chen7Wensheng Hou8Key Laboratory of Biorheological Science and Technology, Ministry of Education, Bioengineering College, Chongqing University, Chongqing 400044, ChinaKey Laboratory of Biorheological Science and Technology, Ministry of Education, Bioengineering College, Chongqing University, Chongqing 400044, ChinaKey Laboratory of Biorheological Science and Technology, Ministry of Education, Bioengineering College, Chongqing University, Chongqing 400044, ChinaCollege of Automation, Harbin Engineering University, Harbin 150001, ChinaChongqing Engineering Research Center of Medical Electronics Technology, Chongqing 400044, ChinaKey Laboratory of Biorheological Science and Technology, Ministry of Education, Bioengineering College, Chongqing University, Chongqing 400044, ChinaKey Laboratory of Biorheological Science and Technology, Ministry of Education, Bioengineering College, Chongqing University, Chongqing 400044, ChinaChongqing Engineering Research Center of Medical Electronics Technology, Chongqing 400044, ChinaKey Laboratory of Biorheological Science and Technology, Ministry of Education, Bioengineering College, Chongqing University, Chongqing 400044, ChinaThe study aims to explore the spatial distribution of multi-tendinous muscle modulated by central nervous system (CNS) during sustained contraction. Nine subjects were recruited to trace constant target forces with right index finger extension. Surface electromyography (sEMG) of extensor digitorum (ED) were recorded with a 32-channel electrode array. Nine successive topographic maps (TM) were obtained. Pixel wise analysis was utilized to extract subtracted topographic maps (STM), which exhibited inhomogeneous distribution. STMs were characterized into hot, warm, and cool regions corresponding to higher, moderate, and lower change ranges, respectively. The relative normalized area (normalized to the first phase) of these regions demonstrated different changing trends as rising, plateauing, and falling over time, respectively. Moreover, the duration of these trends were found to be affected by force level. The rising/falling periods were longer at lower force levels, while the plateau can be achieved from the initial phase for higher force output (45% maximal voluntary contraction). The results suggested muscle activity reorganization in ED plays a role to maintain sustained contraction. Furthermore, the decreased dynamical regulation ability to spatial reorganization may be prone to induce fatigue. This finding implied that spatial reorganization of muscle activity as a regulation mechanism contribute to maintain constant force production.https://www.mdpi.com/1424-8220/19/3/555spatial reorganizationinhomogeneous muscle activitymulti-channel surface electromyographyneuromuscular compartmentsustained contraction |
| spellingShingle | Zhixian Gao Shangjie Tang Xiaoying Wu Qiang Fu Xingyu Fan Yun Zhao Lintao Hu Lin Chen Wensheng Hou Spatial Reorganization of Myoelectric Activities in Extensor Digitorum for Sustained Finger Force Production Sensors spatial reorganization inhomogeneous muscle activity multi-channel surface electromyography neuromuscular compartment sustained contraction |
| title | Spatial Reorganization of Myoelectric Activities in Extensor Digitorum for Sustained Finger Force Production |
| title_full | Spatial Reorganization of Myoelectric Activities in Extensor Digitorum for Sustained Finger Force Production |
| title_fullStr | Spatial Reorganization of Myoelectric Activities in Extensor Digitorum for Sustained Finger Force Production |
| title_full_unstemmed | Spatial Reorganization of Myoelectric Activities in Extensor Digitorum for Sustained Finger Force Production |
| title_short | Spatial Reorganization of Myoelectric Activities in Extensor Digitorum for Sustained Finger Force Production |
| title_sort | spatial reorganization of myoelectric activities in extensor digitorum for sustained finger force production |
| topic | spatial reorganization inhomogeneous muscle activity multi-channel surface electromyography neuromuscular compartment sustained contraction |
| url | https://www.mdpi.com/1424-8220/19/3/555 |
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