diadochokinesia

noun

di·​a·​do·​cho·​ki·​ne·​sia

variants or diadokokinesia

dī-ˌad-ə-ˌkō-kə-ˈnē-zh(ē-)ə  ˌdī-ə-ˌdō-(ˌ)kō- 

-kī-ˈnē-

: the normal power of alternating diametrically opposite muscular actions (as flexion and extension of a limb)

diadochokinetic adjective

or diadokokinetic

-kə-ˈnet-ik, -kī-ˈnet-