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. 2013 Aug 27;10(11):1445–1450. doi: 10.7150/ijms.4732

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© Ivyspring International Publisher. This is an open-access article distributed under the terms of the Creative Commons License (http://creativecommons.org/licenses/by-nc-nd/3.0/). Reproduction is permitted for personal, noncommercial use, provided that the article is in whole, unmodified, and properly cited.

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Sensing magnetic flux density of the thoracic cage with a MEMS device during respiratory and cardiac activity. A, Diagram of the experimental arrangement. A MEMS magnetic field sensor was introduced within the open thoracic cage of an anesthetized and ventilated rat. B, Electromyogram of the thoracic muscles and magnetic flux density recordings during the respiratory activity of the rat (respiratory magnetogram). C and D, Power spectrum density (PSD) calculated from the EMG and from the magnetic flux density, respectively. We found a significant coherence (E) between these rectified and integrated electric and magnetic signals at the respiratory frequency.

Sensing magnetic flux density of the thoracic cage with a MEMS device during respiratory and cardiac activity. A, Diagram of the experimental arrangement. A MEMS magnetic field sensor was introduced within the open thoracic cage of an anesthetized and ventilated rat. B, Electromyogram of the thoracic muscles and magnetic flux density recordings during the respiratory activity of the rat (respiratory magnetogram). C and D, Power spectrum density (PSD) calculated from the EMG and from the magnetic flux density, respectively. We found a significant coherence (E) between these rectified and integrated electric and magnetic signals at the respiratory frequency.