| Summary: | 碩士 === 長庚大學 === 復健科學研究所 === 92 === Background: Hypertonus is a common problem occurred six to twelve months following spinal cord injury. Previous studies showed that repeated stretch can decrease joint stiffness and motoneuron excitability in healthy adults. The purpose of this study is to examine the effect of ankle repeated stretch (RS) on reducing reflex and non-reflex components of muscle tone on healthy people and on individuals with chronic complete SCI. Methods: Ten healthy people and nine individuals with chronic complete SCI (post injury >1year) subjects participated in an one hour repeated ankle stretch treatment, using a custom-made repeated stretch and torque measurement system. The stretching range was between 15°dorsiflexion and 15°plantarflexion. The stretching velocity was 25°/s and 50 cycles per minute.Modified Ashworth Scale, H-reflex amplitude, H reflex depression ratio and passive resistive torque were measured before, immediately after and 10 minutes after ankle RS. Results: In healthy subjects, the amplitude of H reflex significantly decreased from 26.63±10.31% to 15.70±11.66% of maximal M wave amplitude(p<0.0001), the H reflex depression ratio and the passive resistive torque did not change significantly after one hour of ankle RS. In chronic SCI subjects, the score of Modified Ashworth Scale decreased, the amplitude of H reflex significantly decreased from 27.62±30.44% to 20.84±25.23% of maximal M wave amplitude (p<0.0001), the H reflex depression ratio and the passive resistive torque did not change significantly changed after one hour of ankle RS. Conclusion: One hour ankle repeated stretch can decrease reflexive part of hypertonus through peripheral mechanism.
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