Changes in human alpha-motoneurone excitability following mechanical muscle stimuli

✍ Scribed by D. Claus; K. R. Mills; N. M. F. Murray; D. R. Fish

• Book ID: 104778823
• Publisher: Springer-Verlag
• Year: 1989
• Tongue: English
• Weight: 304 KB
• Volume: 238
• Category: Article
• ISSN: 1433-8491
• DOI: 10.1007/bf00451001

✦ Synopsis

Short mechanical stretches given to partially activated human abductor digiti minimi muscle (ADM) evoke early (M 1) and late (M 2) reflex responses Transcranial magnetic brain stimuli were used to evoke compound muscle action potentials in ADM and hence to estimate motoneuronal excitability at various times after mechanical stimuli There was no evidence that Ia volleys produce additional facilitation in motoneurones of muscles which are already voluntarily activated However, the inhibitory phase between M 1 and M 2 was associated with a reduction in size of muscle responses from brain stimuli This may reflect reduced Ia input, polysynaptic Ia inhibition or Renshaw inhibition.