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Force Control Is Related to Low-Frequency Oscillations in Force and Surface EMG

Author

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  • Hwasil Moon
  • Changki Kim
  • Minhyuk Kwon
  • Yen Ting Chen
  • Tanya Onushko
  • Neha Lodha
  • Evangelos A Christou

Abstract

Force variability during constant force tasks is directly related to oscillations below 0.5 Hz in force. However, it is unknown whether such oscillations exist in muscle activity. The purpose of this paper, therefore, was to determine whether oscillations below 0.5 Hz in force are evident in the activation of muscle. Fourteen young adults (21.07±2.76 years, 7 women) performed constant isometric force tasks at 5% and 30% MVC by abducting the left index finger. We recorded the force output from the index finger and surface EMG from the first dorsal interosseous (FDI) muscle and quantified the following outcomes: 1) variability of force using the SD of force; 2) power spectrum of force below 2 Hz; 3) EMG bursts; 4) power spectrum of EMG bursts below 2 Hz; and 5) power spectrum of the interference EMG from 10–300 Hz. The SD of force increased significantly from 5 to 30% MVC and this increase was significantly related to the increase in force oscillations below 0.5 Hz (R2 = 0.82). For both force levels, the power spectrum for force and EMG burst was similar and contained most of the power from 0–0.5 Hz. Force and EMG burst oscillations below 0.5 Hz were highly coherent (coherence = 0.68). The increase in force oscillations below 0.5 Hz from 5 to 30% MVC was related to an increase in EMG burst oscillations below 0.5 Hz (R2 = 0.51). Finally, there was a strong association between the increase in EMG burst oscillations below 0.5 Hz and the interference EMG from 35–60 Hz (R2 = 0.95). In conclusion, this finding demonstrates that bursting of the EMG signal contains low-frequency oscillations below 0.5 Hz, which are associated with oscillations in force below 0.5 Hz.

Suggested Citation

  • Hwasil Moon & Changki Kim & Minhyuk Kwon & Yen Ting Chen & Tanya Onushko & Neha Lodha & Evangelos A Christou, 2014. "Force Control Is Related to Low-Frequency Oscillations in Force and Surface EMG," PLOS ONE, Public Library of Science, vol. 9(11), pages 1-9, November.
    • Handle: RePEc:plo:pone00:0109202
    DOI: 10.1371/journal.pone.0109202
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    References listed on IDEAS

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    1. Neha Lodha & Gaurav Misra & Stephen A Coombes & Evangelos A Christou & James H Cauraugh, 2013. "Increased Force Variability in Chronic Stroke: Contributions of Force Modulation below 1 Hz," PLOS ONE, Public Library of Science, vol. 8(12), pages 1-9, December.
    2. Christopher M. Harris & Daniel M. Wolpert, 1998. "Signal-dependent noise determines motor planning," Nature, Nature, vol. 394(6695), pages 780-784, August.
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    1. Jakob Lund Dideriksen & Dario Farina, 2019. "Amplitude cancellation influences the association between frequency components in the neural drive to muscle and the rectified EMG signal," PLOS Computational Biology, Public Library of Science, vol. 15(5), pages 1-19, May.

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