During the overhead squat assessment, which muscle is likely underactive if the heels elevate?

When conducting the overhead squat assessment, if the heels elevate during the movement, it suggests a potential issue with ankle mobility or muscular imbalances. The tibialis anterior is crucial in maintaining proper foot position and providing stability during the squat. This muscle helps in dorsiflexing the ankle, which is necessary for keeping the heels down.

If the tibialis anterior is underactive or lacks proper strength, the body may struggle to achieve effective dorsiflexion. As a result, the heels may lift as the individual compensates for inadequate ankle movement by shifting their weight forward. This compensatory movement can indicate that the body is not properly functioning as a unit, leading to elevation of the heels during the squat. Thus, the underactivity of the tibialis anterior is a likely reason for this fault during the overhead squat assessment.