Ultrasound imaging in women's arm flexor muscles: intra-rater reliability of muscle thickness and echo intensity.

Background: Different ultrasound parameters have been frequently used to assess changes associated with training, aging, immobilization, and neuromuscular diseases. However, an exploratory reliability analysis of the echo intensity (EI) and muscle thickness (MT) of the forearm flexors is scarce, especially in women.

Objective: The purpose of the present study was to determine the intra-rater reliability of MT and EI assessed by ultrasound in young women.