Abstract

Simultaneous NMR and EMG study adds an extra dimension in correlation between the electrical activity of a muscle and the biochemical events that occur during exercise, fatigue and recovery. However some of the potential difficulties involved in the simultaneous study include RF noise interference, transmission losses and movement artifact. We have successfully evaluated these problems associated with simultaneous 31P-NMR spectroscopy and EMG study on human calf muscle at 2T in a whole body magnet. The effect of RF noise and magnetic field on EMG signal was evaluated by first acquiring EMG signal outside of the magnet performing voluntary wrist contraction (for simplicity in administration) using a low intensity protocol. After performing similar exercise inside the magnet, a power spectrum analysis was done which indicated a high frequency shift in the median frequency implying the presence of high frequency noise component. Effect of transmission loss was observed using normal and twisted shielded cables. Using a low pass and band pass filter circuits, high frequency RF noise and low frequency electromagnetically induced emf artifact were eliminated. Transmission losses were minimized by the use of shielded twisted cables.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
National Center for Research Resources (NCRR)
Type
Biotechnology Resource Grants (P41)
Project #
5P41RR002305-13
Application #
5224016
Study Section
Project Start
Project End
Budget Start
Budget End
Support Year
13
Fiscal Year
1996
Total Cost
Indirect Cost

  Publications

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Rosenbaum, Michael; Leibel, Rudolph L (2016) Models of energy homeostasis in response to maintenance of reduced body weight. Obesity (Silver Spring) 24:1620-9
Machida, Manabu; Panasyuk, George Y; Wang, Zheng-Min et al. (2016) Radiative transport and optical tomography with large datasets. J Opt Soc Am A Opt Image Sci Vis 33:551-8
Ban, H Y; Schweiger, M; Kavuri, V C et al. (2016) Heterodyne frequency-domain multispectral diffuse optical tomography of breast cancer in the parallel-plane transmission geometry. Med Phys 43:4383
Franklin, Teresa R; Jagannathan, Kanchana; Wetherill, Reagan R et al. (2015) Influence of menstrual cycle phase on neural and craving responses to appetitive smoking cues in naturally cycling females. Nicotine Tob Res 17:390-7

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