Supraspinal effects on the fractal correlation in human H-reflex

Experimental Brain Research
D NozakiY Yamamoto

Abstract

In our previous study, 1/f beta-type power spectrum with the spectral exponent beta significantly greater than zero was found in the variability of soleus H-reflex amplitudes. This result indicated that the H-reflex variability was time-correlated owing to fractal characteristics. Furthermore, it was also suggested that the fractal characteristics were generated at the spinal level. The purpose of the present study was to investigate whether the fractal nature of the H-reflex variability was influenced by the loss of supraspinal input. Six healthy normal subjects and seven patients with spinal cord injury participated in this study. Soleus H-reflexes were evoked every 1 s from both legs simultaneously (stimulation intensity: motor threshold) and 1050 successive amplitudes of the H-reflex were recorded. The H-reflex sequence evoked from each leg was analyzed by "coarse graining spectral analysis" to calculate the spectral exponent beta. The value of beta was used to evaluate the level of time-correlation (fractal correlation). Cross-spectral analysis was used to evaluate the degree of synchronization between the H-reflex sequences evoked from both legs. The beta values for normal subjects (0.84 +/- 0.33, left leg; 0.88 +/- 0.34....Continue Reading

Citations

Jun 13, 2006·Experimental Brain Research·Noritaka KawashimaKimitaka Nakazawa
Sep 5, 2001·Acta Physiologica Scandinavica·K NakazawaT Fukunaga
Apr 24, 2002·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·D NozakiY Yamamoto
Mar 31, 1999·Journal of Neurotrauma·X Y ChenB T Stokes
Jul 15, 2005·Journal of Neurophysiology·E ManjarrezA F Kohn
Mar 4, 2006·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·Hesham N Alrowayeh, Mohamed A Sabbahi

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