Position-dependent, hyperexcitable patellar reflex dynamics in chronic stroke

  • Yang C
  • Guo X
  • Ren Y
 et al. 
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Objectives: To quantify tendon tap response (TTR) properties and their position dependence using multiple neuromechanical parameters, and to analyze correlations among neuromechanical and clinical measures. Design: Hyperexcitable dynamics of TTR were investigated in a case-control manner. An instrumented hammer was used to induce the patellar deep tendon reflex (DTR), with reflex-mediated electromyography and torque responses measured across a range of knee flexion. Setting: Research laboratory in a rehabilitation hospital. Participants: Chronic hemiplegic stroke survivors (n=9) and healthy subjects (n=13). Interventions: Not applicable. Main Outcome Measures: Neuromechanical measures (system gain, contraction rate, half-relaxation rate, reflex loop delay, peak reflex torque, peak reflex electromyography, and reflex threshold in tapping force) were measured to characterize neuromuscular properties of patellar TTR. Clinical measurements were taken using the DTR scale and the Modified Ashworth Scale. Results: The system gain, contraction rate, half-relaxation rate, and peak reflex-mediated torque in the stroke group were generally higher, whereas the reflex threshold in the stroke group was significantly lower than their counterparts in the control group across 45° to 90° of knee flexion (P

Author-supplied keywords

  • Muscle spasticity
  • Reflex, tendon
  • Rehabilitation
  • Stretch reflex
  • Stroke

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  • Chung Yong Yang

  • Xin Guo

  • Yupeng Ren

  • Sang Hoon Kang

  • Li Qun Zhang

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