Electromyographic pattern in lower limbs in response to postural perturbations / Padrão eletromiográfico de membros inferiores em resposta a perturbações posturais

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Balance depends on the synergic activation of muscles bilaterally, and there is evidence that this coordination is mediated by spinal circuits, which are under supra-spinal control. The objective of this study is to describe neurophysiologic and biomechanical mechanisms involved in the postural control of healthy subjects submitted to a disturbance provoked by a muscular reflex contraction. The postural perturbation was caused by a unilateral electric stimulation to the popliteal fossa. The analysis emphasizes the mechanisms associated with interlimb coordination. In this work, methodological approaches expanded those of previous work, the recordings being done bilaterally and the stimulus being precisely controlled. The results showed a complex pattern of bilateral muscular activation. Short and medium latency responses were found in the leg and thigh muscles. These were followed by some muscular activity at longer latencies, probably occurring due to the postural oscillations. The initial muscular responses suggest that the afferent inflow and the spinal cord reflexes have an important function in the between-limb coordination during the standing posture.

ASSUNTO(S)

neurophysiology h-reflex center of pressure electromyography neural pathways processos motores spinal reflexes reflexo h motor processes postura vias neurais reflexos medulares centro de pressão eletromiografia posture neurofisiologia

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