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Paper Abstract and Keywords
Presentation 2026-01-30 13:10
A Threshold Setting Method Enabling Detection and Extraction of Motor Unit Activity in Surface EMG during Relaxation
Hidetoshi Nagai (KIT) NLP2025-121 MBE2025-61 NC2025-83
Abstract (in Japanese) (See Japanese page) 
(in English) Surface electromyography (sEMG) is a non-invasive technique for electrically measuring muscle activity. Detailed analysis of muscle activity requires examination of the activity of motor units constituting the muscle. Therefore, we have developed a method for extracting motor unit action potential waveforms from surface electromyographic signals. For noise reduction in weak sEMG signals, it is commonly reasonable to determine a detection threshold under the assumption that signals recorded during muscle relaxation consist almost entirely of noise. While this assumption is generally valid, it becomes inappropriate when the presence or absence of abnormal motor unit firing during muscle relaxation must be evaluated, as in examinations for neuromuscular disorders. This paper proposes a threshold-setting method that enables the detection of motor unit activity in surface electromyographic signals recorded during muscle relaxation. The thresholds determined by the proposed method are also applicable to the detection of motor unit activity during normal muscle contractions.
Keyword (in Japanese) (See Japanese page) 
(in English) surface EMG / motor unit / extracting motor unit activity / motor unit firing during muscle relaxation / redundant wavelet analysis / wavelet coefficient set / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 345, MBE2025-61, pp. 170-175, Jan. 2026.
Paper # MBE2025-61 
Date of Issue 2026-01-21 (NLP, MBE, NC) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF NLP2025-121 MBE2025-61 NC2025-83

Conference Information
Committee NC MBE NLP IEE-MBE  
Conference Date 2026-01-28 - 2026-01-30 
Place (in Japanese) (See Japanese page) 
Place (in English) Kyushu Institute of Technology, Wakamatsu Campus 
Topics (in Japanese) (See Japanese page) 
Topics (in English) NC, NLP, ME, etc. 
Paper Information
Registration To MBE 
Conference Code 2026-01-NC-MBE-NLP-MBE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Threshold Setting Method Enabling Detection and Extraction of Motor Unit Activity in Surface EMG during Relaxation 
Sub Title (in English)  
Keyword(1) surface EMG  
Keyword(2) motor unit  
Keyword(3) extracting motor unit activity  
Keyword(4) motor unit firing during muscle relaxation  
Keyword(5) redundant wavelet analysis  
Keyword(6) wavelet coefficient set  
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Keyword(8)  
1st Author's Name Hidetoshi Nagai  
1st Author's Affiliation Kyushu Institute of Technology (KIT)
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Speaker Author-1 
Date Time 2026-01-30 13:10:00 
Presentation Time 25 minutes 
Registration for MBE 
Paper # NLP2025-121, MBE2025-61, NC2025-83 
Volume (vol) vol.125 
Number (no) no.344(NLP), no.345(MBE), no.346(NC) 
Page pp.170-175 
#Pages 6 
Date of Issue 2026-01-21 (NLP, MBE, NC) 

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