Passive leg motion changes in cerebral palsied children after whole body vertical acceleration

Fee, J.W.; Samworth, K.T.

doi:10.1109/86.392364

Cited by 7 publications

(2 citation statements)

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“…The results support prior work done by Fee et al, which described observable changes in the PKD trajectory post cyclic vertical acceleration [9]. While the optimal frequency of cyclic oscillation is unknown, recent studies have shown that the human head experiences a principal vertical frequency of 2 Hz while walking [10].…”

Section: Introductionsupporting

confidence: 90%

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Alterations of neuromuscular signals as a result of vestibular stimulation

Androwis

Michael

Strongwater

et al. 2013

2013 6th International IEEE/EMBS Conference on Neural Engineering (NER)

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Interest in a better understanding of mechanical vestibular stimulation and its effect on changing the muscle tone in individuals with Cerebral Palsy (CP) is the motivation of this study. Stimulation to the otoliths has shown a reduction in the degree of spasticity in population with neuromuscular disabilities. Three children with CP were involved in this study of whom two are twins (12 year-old, female) and the third is a 14-year old, male. The pendulum knee drop (PKD) test was used to evaluate the degree of subject's spasticity. The vestibular stimulation consisted of vertical oscillation with 3 inches of amplitude, a frequency of 2 Hz and a 15 minute duration. This form of stimulation targets the saccule organ in the vestibular system, which results in alteration of the descending signals of the vestibular system responsible for setting tone of the antigravity muscles. Electromyography (EMG) is simultaneously recorded from the quadriceps (Vastus Lateralis) and hamstring (Biceps Femoris) muscles along with the PKD test. The activation of EMG during PKD can be understood in relationship to the flexion and extension of the lower leg. It is interesting that EMG activity for quadriceps is seen at every flexion cycle in the post stimulation data, while on the other hand EMG activity is nearly continuous in the initial cycles of PKD in the pre stimulation. This may be an indication of a change in the activation pattern of EMG from the agonist and antagonist muscles asa result of the vestibular stimulation, which causes neural changes in the vestibular descending signal. In all three subjects of this study, the knee stiffness and damping parameters show a dramatic decrease post vestibular stimulation, and a smaller change is also noticed in the parameter describing virtual trajectory.

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Section: Introductionsupporting

confidence: 90%

“…Other projections from the vestibular system go directly to the cerebellum as shown in (Fig.2). The vestibular nuclei project through the spinal cord to efferent neurons which are responsible for controling antigravity muscles [9]. Thus, projections from the otoliths contribute to setting the tone of these muscles (Fig.2).…”

Section: Introductionmentioning

confidence: 99%