Test-retest repeatability of electrically-evoked isotonic power and isometric torque in the plantar flexors.

Abstract

Electrically-evoked isometric torque has good to excellent repeatability, but the degree of repeatability for electrically-evoked isotonic power is unknown. We evaluated the test-retest repeatability of plantar flexion isometric torque and isotonic power evoked using brief tetanic trains at 10 Hz and 50 Hz. Both torque and power had excellent (intraclass correlation coefficient >0.9) repeatability at low and high frequencies. Similar to isometric torque, electrically-evoked isotonic power is a stable measure for studying dynamic muscle function.