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Grant number: 11/13222-6
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): November 01, 2011
Effective date (End): December 31, 2012
Field of knowledge:Engineering - Biomedical Engineering - Bioengineering
Principal researcher:André Fábio Kohn
Grantee:Fernando Henrique Magalhães
Home Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil


The ability to perform voluntary muscle contractions with minimum fluctuations in torque while matching a given torque level represents a measure of how accurately and smoothly a subject can control the torque developed by a particular muscle or muscle group. The precision of these movements is controlled by the central nervous system on the basis of information from sensory inputs applied to the visual, vestibular and somatosensory systems. So, the investigation of how the nervous system controls movements has been studied in several ways, for example by applying sensory inputs in addition to those occurring naturally. More specifically, noise-based sensory stimulations have been employed so as to enhance somatosensation and hence improve the control of postural sway. One of the aims of this work is to investigate the effects of electrical noise stimulation (applied to the leg muscles and to the foot soles) on plantarflexion torque variability (voluntarily maintained), during two different tasks, one being performed with a constant torque level against a rigid restraint (force task, FT) and the other with a constant angle while supporting an inertial load (position task, PT). The second aim is to evaluate, by the conditioning of the H reflex with stimulation on the common peroneal nerve, the inhibitory spinal circuits (more specifically, the levels of reciprocal inhibition and presynaptic inhibition) associated with the muscles responsible for plantarflexion torque maintenance during the two different tasks (FT and PT). Besides allowing a better understanding on the neurophysiology of neuromuscular control, the results with healthy subjects may indicate the potential for the clinical usage of noise-based stimulations to enhance neuromuscular control in a population with sensory-motor impairments.

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Scientific publications (9)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MAGALHAES, FERNANDO HENRIQUE; ELIAS, LEONARDO ABDALA; DA SILVA, CRISTIANO ROCHA; DE LIMA, FELIPE FAVA; DE TOLEDO, DIANA REZENDE; KOHN, ANDRE FABIO. D1 and D2 Inhibitions of the Soleus H-Reflex Are Differentially Modulated during Plantarflexion Force and Position Tasks. PLoS One, v. 10, n. 11 NOV 24 2015. Web of Science Citations: 4.
MARTINELLI, ALESSANDRA REZENDE; COELHO, DANIEL BOARI; MAGALHAES, FERNANDO HENRIQUE; KOHN, ANDRE FABIO; TEIXEIRA, LUIS AUGUSTO. Light touch modulates balance recovery following perturbation: from fast response to stance restabilization. Experimental Brain Research, v. 233, n. 5, p. 1399-1408, MAY 2015. Web of Science Citations: 7.
MEZZARANE, RINALDO ANDRE; MAGALHAES, FERNANDO HENRIQUE; CHAUD, VITOR MARTINS; ELIAS, LEONARDO ABDALA; KOHN, ANDRE FABIO. Enhanced D1 and D2 Inhibitions Induced by Low-Frequency Trains of Conditioning Stimuli: Differential Effects on H- and T-Reflexes and Possible Mechanisms. PLoS One, v. 10, n. 3 MAR 25 2015. Web of Science Citations: 7.
MAGALHAES, FERNANDO HENRIQUE; KOHN, ANDRE FABIO. Effectiveness of electrical noise in reducing postural sway: a comparison between imperceptible stimulation applied to the anterior and to the posterior leg muscles. EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY, v. 114, n. 6, p. 1129-1141, JUN 2014. Web of Science Citations: 12.
MELLO, EMANUELE MORAES; MAGALHAES, FERNANDO HENRIQUE; KOHN, ANDRE FABIO. Larger plantar flexion torque variability implies less stable balance in the young: An association affected by knee position. HUMAN MOVEMENT SCIENCE, v. 32, n. 6, p. 1310-1324, DEC 2013. Web of Science Citations: 10.
WATANABE, RENATO N.; MAGALHAES, FERNANDO H.; ELIAS, LEONARDO A.; CHAUD, VITOR M.; MELLO, EMANUELE M.; KOHN, ANDRE F. Influences of premotoneuronal command statistics on the scaling of motor output variability during isometric plantar flexion. Journal of Neurophysiology, v. 110, n. 11, p. 2592-2606, DEC 2013. Web of Science Citations: 13.
MOTTA-OISHI, ANNA AMELIA P.; MAGALHAES, FERNANDO HENRIQUE; DE AZEVEDO, FABIO MICOLIS. Neuromuscular electrical stimulation for stroke rehabilitation: Is spinal plasticity a possible mechanism associated with diminished spasticity?. Medical Hypotheses, v. 81, n. 5, p. 784-788, NOV 2013. Web of Science Citations: 15.
MAGALHAES, FERNANDO HENRIQUE; DE TOLEDO, DIANA REZENDE; KOHN, ANDRE FABIO. Plantar flexion force induced by amplitude-modulated tendon vibration and associated soleus V/F-waves as an evidence of a centrally-mediated mechanism contributing to extra torque generation in humans. JOURNAL OF NEUROENGINEERING AND REHABILITATION, v. 10, MAR 25 2013. Web of Science Citations: 6.
MAGALHAES, FERNANDO HENRIQUE; KOHN, ANDRE FABIO. Imperceptible electrical noise attenuates isometric plantar flexion force fluctuations with correlated reductions in postural sway. Experimental Brain Research, v. 217, n. 2, p. 175-186, MAR 2012. Web of Science Citations: 17.

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