Treffer: Real-time distance monitoring in magnetomyography.

Title:
Real-time distance monitoring in magnetomyography.
Authors:
Yang H; Department of Neural Dynamics and Magnetoencephalography, Hertie-Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany.; MEG-Center, University of Tübingen, Tübingen, Germany.; Center for Integrative Neuroscience, University of Tübingen, Tübingen, Germany.; Center for Bionic Intelligence Tübingen Stuttgart (BITS), Tübingen, Germany., Senay B; Department of Neural Dynamics and Magnetoencephalography, Hertie-Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany.; MEG-Center, University of Tübingen, Tübingen, Germany.; Center for Integrative Neuroscience, University of Tübingen, Tübingen, Germany.; Center for Bionic Intelligence Tübingen Stuttgart (BITS), Tübingen, Germany., Sorrentino C; Department of Neural Dynamics and Magnetoencephalography, Hertie-Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany.; MEG-Center, University of Tübingen, Tübingen, Germany.; Center for Integrative Neuroscience, University of Tübingen, Tübingen, Germany.; Center for Bionic Intelligence Tübingen Stuttgart (BITS), Tübingen, Germany., Bouraima F; Department of Neural Dynamics and Magnetoencephalography, Hertie-Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany.; MEG-Center, University of Tübingen, Tübingen, Germany.; Center for Integrative Neuroscience, University of Tübingen, Tübingen, Germany.; Center for Bionic Intelligence Tübingen Stuttgart (BITS), Tübingen, Germany., Siegel M; Department of Neural Dynamics and Magnetoencephalography, Hertie-Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany.; MEG-Center, University of Tübingen, Tübingen, Germany.; Center for Integrative Neuroscience, University of Tübingen, Tübingen, Germany.; Center for Bionic Intelligence Tübingen Stuttgart (BITS), Tübingen, Germany., Marquetand J; Department of Neural Dynamics and Magnetoencephalography, Hertie-Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany.; MEG-Center, University of Tübingen, Tübingen, Germany.; Center for Integrative Neuroscience, University of Tübingen, Tübingen, Germany.; Center for Bionic Intelligence Tübingen Stuttgart (BITS), Tübingen, Germany.; Institute for Modelling and Simulation of Biomechanical Systems, University of Stuttgart, Stuttgart, Germany.
Source:
Journal of neural engineering [J Neural Eng] 2025 Nov 10; Vol. 22 (6). Date of Electronic Publication: 2025 Nov 10.
Publication Type:
Journal Article
Language:
English
Journal Info:
Publisher: Institute of Physics Pub Country of Publication: England NLM ID: 101217933 Publication Model: Electronic Cited Medium: Internet ISSN: 1741-2552 (Electronic) Linking ISSN: 17412552 NLM ISO Abbreviation: J Neural Eng Subsets: MEDLINE
Imprint Name(s):
Original Publication: Bristol, U.K. : Institute of Physics Pub., 2004-
MeSH Terms:
Magnetometry*/instrumentation , Magnetometry*/methods , Muscle, Skeletal*/physiology , Myography*/methods , Myography*/instrumentation, Humans ; Male ; Adult ; Female ; Electromyography/methods ; Electromyography/instrumentation ; Muscle Fatigue/physiology ; Young Adult ; Computer Systems ; Isometric Contraction/physiology
Contributed Indexing:
Keywords: fiber optic sensor; isometric contraction; muscle fatigue; optically pumped magnetometer; root mean square
Entry Date(s):
Date Created: 20251028 Date Completed: 20251112 Latest Revision: 20251112
Update Code:
20251113
DOI:
10.1088/1741-2552/ae1874
PMID:
41151105
Database:
MEDLINE

Weitere Informationen

Objective. Magnetomyography (MMG) using optically pumped magnetometers (OPM) offers a contactless, non-invasive approach to assess muscle activity. However, fluctuations in the sensor-to-source distance during MMG recordings pose a significant challenge to accurate signal interpretation since amplitude decays with distance. No established method exists for MMG to continuously monitor sensor-to-source distance changes in real-time. Approach. This study presents a new non-magnetic, cost-effective solution using a digital fiber optic sensor to continuously measure the distance between an OPM and the subject's skin. Following sensor calibration, distance measurements were recorded during an isometric muscle fatigue task in five healthy participants to assess whether MMG amplitude changes were due to physiological effects or variations in sensor-to-source distance. Alongside OPM-MMG and distance tracking, electromyography (EMG), the neurophysiological gold standard, was simultaneously recorded. Main results. We found significant changes in MMG-RMS and MMG-MDF during muscle fatigue that were not merely explained by changes in sensor-to-source distance. Furthermore, we found substantial correlations between OPM-MMG and EMG that were strongest for small sensor-to-source distance ( r = 0.91). Significance. Fiber optic sensors offer non-magnetic, precise, real-time monitoring of the distance between the OPM and the skin, making it ideal for MMG applications to account for distance-related variability during measurements. Our results suggest that changes in MMG-RMS and MMG-MDF during muscle fatigue reflect genuine physiological effects rather than distance confounds.
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