Abstract
Magnetocardiograms (MCG) represent a non-invasive method of measuring functional information concerning the electrical activities of the heart. We carried out exercise-induced MCGs and body surface potential maps (BSPMs) for normal subjects. The MCGs were measured with a three dimensional second-order gradiometer connected to a 39-channel superconducting quantum interface device (SQUID), which could simultaneously detect magnetic field components perpendicular to the chest wall (Bz) and tangential to the chest wall (Bx, By). The power map was calculated to examine the change in spatial distribution before and after exercise. We found that the spatial distribution at QRS complex was different before and after exercise when we applied singular value decomposition (SVD) to the power map. Time-frequency analysis (wavelet analysis) was applied to the MCGs and BSPMs to examine the change in the power spectrum of the QRS complex and ST segment. We found that the frequency component of Bz in MCGs reconstructed by the second singular value was different.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
