Título:	Current perception threshold and reaction time in the assessment of sensory peripheral nerve fibers through sinusoidal electrical stimulation at different frequencies
Autor(es):	Martins, Henrique Resende Zanetti, Renato Paz, Clarissa Cardoso dos Santos Couto Manzano, Gilberto Mastrocola Tierra-Criollo, Carlos Julio
Assunto:	Sensores Tempo de reação Percepção Sistema nervoso central Neuropatia periférica
Data de publicação:	Set-2013
Editora:	SBEB - Sociedade Brasileira de Engenharia Biomédica
Referência:	MARTINS, Henrique Resende et al. Current perception threshold and reaction time in the assessment of sensory peripheral nerve fibers through sinusoidal electrical stimulation at different frequencies. Revista Brasileira de Engenharia Biomédica, Rio de Janeiro, v. 29, n. 3, p. 278-285, set. 2013. DOI: http://dx.doi.org/10.4322/rbeb.2013.028. Disponível em: https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-31512013000300008. Acesso em: 04 ago. 2020.
Abstract:	INTRODUCTION: The Perception Sensory Threshold (ST) for sinusoidal current stimuli at 5, 250, and 2,000 Hz is commonly used in the assessment of peripheral nerve fibers (C, Aδ, and Aβ, respectively). However, the neuroselectivity of these frequencies is far from consensus. In addition, Reaction Time (RT) measurements suggest that 2,000 Hz stimuli excite Aβ-fibers, 250 Hz Aβ- or Aδ-fibers, as well as 5 Hz Aβ-, Aδ- or C-fibers. Therefore, we suppose that the sinusoidal current neuroselectivity may be better observed if ST and RT parameters are jointly evaluated. In addition, we have investigated whether there are other sets of frequencies that could be used. METHODS: Thus this work investigates ST and RT for stimuli with frequency ranging from 1 to 3,000 Hz, on 28 healthy subjects aged from 19 to 44 years old (27.1±5.49). ST and RT dissimilarity among different frequencies was evaluated applying bi-dimensional Fisher Quadratic Discriminant. RESULTS: The lowest classification error (3.6%) was obtained for 1, 250, and 3,000 Hz. Error for 5, 250, and 2,000Hz was 16.7%. Stimulation frequency at 1 Hz evoked more sensations related to C-fibers (53% of reports) than to Aβ-fibers (36%). However, this behavior did not repeat itself at 5 Hz (only 21% of perceptions were related to C-fibers against 64% to Aβ-fibers). Sensations related to Aβ-fibers prevailed for the highest frequencies presented to the subjects (2,000 Hz - 82% and 3,000 Hz - 93%). Mean RT values showed a decreasing trend with frequency. CONCLUSION: These results suggest that frequencies 1, 250, and 3,000 Hz are more neuroselective than 5, 250, and 2,000 Hz for the evaluation of peripheral sensitive fibers. Furthermore, they show RT usefulness.
Licença:	Revista Brasileira de Engenharia Biomédica - (CC BY-NC) - All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License. Fonte: https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-31512013000300008. Acesso em: 04 ago. 2020.
DOI:	https://dx.doi.org/10.4322/rbeb.2013.028
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