Quantitative magnetic detection of finger movements in patients with Parkinson's disease

Akihiko Kandori, Masaru Yokoe, Saburo Sakoda, Kazuo Abe, Tsuyoshi Miyashita, Hiroshi Oe, Hiroaki Naritomi, Kuniomi Ogata, Keiji Tsukada

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

To develop a new measurement tool for quantitatively detecting the finger movement of a patient with Parkinson's disease (PD), we designed a magnetic sensing system consisting of a magnetic induction coil, a sensing coil, and a circuit unit. The sensing coil detects the inducted magnetic field that varies with the distance between the two coils, and the detected signals are demodulated in the circuit unit in order to obtain the variation voltage from the oscillation frequency. To obtain a coefficient for converting voltage to distance, we measured the output voltages for seven fixed finger positions of 12 normal volunteers. The voltage differences corresponding to the finger movement in 20 PD patients, six age-matched controls, and 12 normal volunteers were then recorded for 30 s. To investigate the velocity and acceleration of the finger movement, we calculated their waveforms from the measured displacement waveform. We also detected the main frequency of the tapping rhythm by using a fast Fourier transform (FFT). The averaged amplitude of each waveform decreased with the disorder in the Hoehn-Yahr (HY) stage, while the averaged tapping frequency of PD patients did not have any correlation with this stage. It can be concluded that this magnetic sensing system can assess finger movement quantitatively.

Original languageEnglish
Pages (from-to)253-260
Number of pages8
JournalNeuroscience Research
Volume49
Issue number2
DOIs
Publication statusPublished - Jun 1 2004

Keywords

  • Finger tapping
  • Magnetic detection
  • Parkinson's disease

ASJC Scopus subject areas

  • Neuroscience(all)

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  • Cite this

    Kandori, A., Yokoe, M., Sakoda, S., Abe, K., Miyashita, T., Oe, H., Naritomi, H., Ogata, K., & Tsukada, K. (2004). Quantitative magnetic detection of finger movements in patients with Parkinson's disease. Neuroscience Research, 49(2), 253-260. https://doi.org/10.1016/j.neures.2004.03.004