Final answer:
During a pulling assessment, scapular elevation suggests underactivity in the lower trapezius and the serratus anterior, which are responsible for scapular depression.
Step-by-step explanation:
When observing scapular elevation during a pulling assessment, the muscles that are likely underactive are those that depress the scapula. These muscles include the lower trapezius and the serratus anterior. It is important for individuals to engage in exercises that strengthen these underactive muscles to improve muscular balance and prevent shoulder dysfunction. Exercises such as scapular pull-downs or wall slides can be beneficial in targeting and activating these muscles.