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Within the resistance exercise literature, echo intensity (EI) is often quantified using different regions of interest (ROI).

To compare changes in the EI of images of the biceps muscle using different ROI immediately following exercise as well as 24 and 48 h following exercise.

Twenty seven non‐resistance trained individuals visited the laboratory 4 times. One arm was assigned to the experimental condition, and the other was a non‐exercise control. During visit 1, paperwork and strength were measured. During visit, 2 participant's muscles were imaged before performing biceps curls. Additional muscle images were taken immediately after exercise, as well as 24 and 48 h post. EI was measured using three different ROI: 1) Trace around the entire muscle; 2) Small box placed in the middle of the muscle (2 × 2cm); and 3) Maximal rectangular box. Results are displayed as means (95%CI …