Iso  – Constant

(Pronounced ahy-suh)

To remember what iso means remember the following mnemonic:

She felt isolated (iso) on the island but she was constantly on the look out for someone to rescue her.

In the words isotonic, isometric and isokinetic, iso means constant. 

Isotonic - Constant tonic - Constant movement

Isometric - Constant metric - Constant distance

Isokinetic - Constant kinetic - Constant speed