Intrafusal effects of botulinum toxin injections for spasticity: Revisiting a previous paper

► Botulinum toxin induces chemodenervation of extra- and intramuscular muscle fibers. ► H-reflex bypasses and stretch reflex activates muscle spindles. ► Intrafusal effects can be isolated from extrafusal effects. ► Intrafusal effects are change in stretch reflex minus change in H-reflex size.