Associated reaction and spasticity among patients with stroke

Kaoru Honaga, Yoshihisa Masakado, Tomomi Oki, Yukiko Hirabara, Toshiyuki Fujiwara, Tetsuo Ota, Akio Kimura, Meigen Liu

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


OBJECTIVES: The objectives were to investigate the relationship between associated reaction (AR) and clinical spasticity in the paretic arm. DESIGN: The participants were ten patients with hemiparetic stroke, mean age of 65.2 yrs, and duration of stroke of 13.3 mos. The AR of the hemiparetic arm was analyzed with surface EMG, and AR ratio was calculated on the basis of comparison of the surface amplitude of the affected side to that of the nonaffected side. Simultaneously, we measured M-, H-, and T-wave amplitudes and calculated H/M and T/M in the paretic arm. The AR ratio, H/M, and T/M were compared with spasticity as assessed with the modified Ashworth scale (MAS). We repeated the same measurements after median nerve block to examine its effects on the parameters. RESULTS: The AR ratio correlated significantly with MAS (P < 0.01), whereas H/M and T/M did not. Median nerve block did not alter these relationships. CONCLUSION: AR, which could be elicited easily in patients with spastic hemiparesis, correlated strongly with spasticity, both before and after the median nerve block. However, the so-called monosynaptic reflex (H- and T reflexes) did not correlate significantly with spasticity. These results indicate that AR and spasticity partially share common pathways.

Original languageEnglish
Pages (from-to)656-661
Number of pages6
JournalAmerican Journal of Physical Medicine and Rehabilitation
Issue number8
Publication statusPublished - 2007 Sept 1


  • Hoffman Reflex
  • Median Nerve Block
  • Modified Ashworth Scale
  • Polysynaptic Reflex

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation
  • Rehabilitation


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