Passive mobilisation is beneficial in maintaining the viscoelastic properties of muscular and periarticular tissues in stroke patients. This same technique may also contrast deafferentation and learned non-use. The aim of this study is assessing the cortical involvement passive mobilisation of the ankle in healthy subjects. EEG and MEG activities were collected bilaterally on 8 healthy subjects (aged 36.5±19.7; 5 male) during rest (REST) and dorsiflexion as produced by voluntary movement (VM), passive mobilization through the SHADE orthosis (O-PM) and neuromuscular electrical stimulation (NMES-PM). Primary sensory and motor areas were identified by Functional Source Separation. EEG derivations were used as markers of secondary sensory, premotor (PMA) and supplementary motor areas (SMA). The effects of attention/distraction were also considered. Power spectral density modulation was used to quantify involvement of sensorimotor areas in the different conditions. Reduction of cortical sensorimotor activity in the alpha (8-12Hz) and beta (13-33Hz) bands was found during VM and both O-PM and NMES-PM, relative to REST. Cerebral involvement, evident in both alpha and beta bands, appears to be more similar to VM during O-PM than NMES-PM. In fact, in primary sensorimotor and PMA, alpha reduction relative to REST was 81% and 83%±20% in VM and O-PM. No reduction was present in NMES-PM. These regions reacted in the beta band by 82% and 80%± 15% in VM and O-PM; only by 87%± 15% in NMES-PM. Reactivities were unchanged in SMA. Stronger task-related sensorimotor involvement was associated with attention than with distraction. We documented clear involvement of sensory and motor regions during passive mobilisation. This stimulation could have clinical implications should it preserve motion patterns through flaccid phases of hemiplegia and support recovery of active functionality. As a future development, medium- and long-term effects of prolonged passive mobilisation will be studied in stroke patients.
Cortical correlate of passive mobilisation of the ankle joint by means of the SHADE orthosis
S Pittaccio;F Tecchio
2008
Abstract
Passive mobilisation is beneficial in maintaining the viscoelastic properties of muscular and periarticular tissues in stroke patients. This same technique may also contrast deafferentation and learned non-use. The aim of this study is assessing the cortical involvement passive mobilisation of the ankle in healthy subjects. EEG and MEG activities were collected bilaterally on 8 healthy subjects (aged 36.5±19.7; 5 male) during rest (REST) and dorsiflexion as produced by voluntary movement (VM), passive mobilization through the SHADE orthosis (O-PM) and neuromuscular electrical stimulation (NMES-PM). Primary sensory and motor areas were identified by Functional Source Separation. EEG derivations were used as markers of secondary sensory, premotor (PMA) and supplementary motor areas (SMA). The effects of attention/distraction were also considered. Power spectral density modulation was used to quantify involvement of sensorimotor areas in the different conditions. Reduction of cortical sensorimotor activity in the alpha (8-12Hz) and beta (13-33Hz) bands was found during VM and both O-PM and NMES-PM, relative to REST. Cerebral involvement, evident in both alpha and beta bands, appears to be more similar to VM during O-PM than NMES-PM. In fact, in primary sensorimotor and PMA, alpha reduction relative to REST was 81% and 83%±20% in VM and O-PM. No reduction was present in NMES-PM. These regions reacted in the beta band by 82% and 80%± 15% in VM and O-PM; only by 87%± 15% in NMES-PM. Reactivities were unchanged in SMA. Stronger task-related sensorimotor involvement was associated with attention than with distraction. We documented clear involvement of sensory and motor regions during passive mobilisation. This stimulation could have clinical implications should it preserve motion patterns through flaccid phases of hemiplegia and support recovery of active functionality. As a future development, medium- and long-term effects of prolonged passive mobilisation will be studied in stroke patients.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
