Any process that activates or increases the frequency, rate or extent of the activity of the inositol 1,4,5-trisphosphate-sensitive calcium-release channel.
Synonyms:
exact_synonym:
positive regulation of IP3 receptor activity; positive regulation of inositol-1,4,5-trisphosphate receptor activity; up regulation of IP3 receptor activity; upregulation of IP3 receptor activity
narrow_synonym:
activation of IP3 receptor activity; stimulation of IP3 receptor activity