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The influence of task type and intensity of muscle contraction in corticomuscular coherence in the control of ankle joint

Grant number: 13/14667-7
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): January 01, 2014
Effective date (End): June 30, 2018
Field of knowledge:Engineering - Biomedical Engineering
Principal Investigator:André Fábio Kohn
Grantee:Diana Rezende de Toledo
Home Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated scholarship(s):14/11300-8 - Dynamic ankle force-matching training associated with subsensory electrical stimulation: cortical and spinal adaptations and effects on postural control, BE.EP.PD

Abstract

The sensorimotor cortex plays an important role in motor control and its study has brought important insights on how posture and movement are influenced by brain mechanisms. Studies based on the corticomuscular coherence (CMC) measured between electroencephalographic and electromyographic signals have been made in recent decades and have helped in understand some of the influences of cortical oscillatory activities on muscle control. The focus of most studies with CMC is towards upper limbs, but CMC for lower limbs is still little known. Given the importance of motor control of the lower limbs to posture and gait, it is important to understand the influence of cortical activity for these control functions. Thus, the aim of this study is to analyze the CMC for two different motor tasks at ankle joint, one being performed with torque against a rigid obstacle (task force, TF) and the other being performed with torque against a free weight (position task, TP). Specifically, we will study the factors that may influence the synergism between cortical and muscular oscillatory activities during TF and TP, including: 1) the type of force applied (static and dynamic), 2) the muscle contraction magnitude, and 3) the frequency of dynamic contraction. The results of this study may provide a better understanding of the specific neurophysiological mechanisms linking the cortex to the motor unit pool of the lower limbs. This knowledge may result in the development of intervention strategies for rehabilitation and may also assist in the monitoring of neural plasticity resulting from therapeutic interventions.

Scientific publications (4)
(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)
TOLEDO, DIANA R.; BARELA, JOSE A.; KOHN, ANDRE F. IMPROVED PROPRIOCEPTIVE FUNCTION BY APPLICATION OF SUBSENSORY ELECTRICAL NOISE: EFFECTS OF AGING AND TASK-DEMAND. Neuroscience, v. 358, p. 103-114, SEP 1 2017. Web of Science Citations: 7.
TOLEDO, DIANA R.; BARELA, JOSE A.; MANZANO, GILBERTO M.; KOHN, ANDRE F. Age-related differences in EEG beta activity during an assessment of ankle proprioception. Neuroscience Letters, v. 622, p. 1-5, MAY 27 2016. Web of Science Citations: 3.
TOLEDO, DIANA R.; MANZANO, GILBERTO M.; BARELA, JOSE A.; KOHN, ANDRE F. Cortical correlates of response time slowing in older adults: ERP and ERD/ERS analyses during passive ankle movement. CLINICAL NEUROPHYSIOLOGY, v. 127, n. 1, p. 655-663, JAN 2016. Web of Science Citations: 14.
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.

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