Muscle timing and activation amplitude and movement can be modified with verbal cues (Lewis & Sahrmann ,2009).
Lewis & Sahrmann tested the participants under 3 conditions: no cues, cues to contract the gluteal muscles, and cues to contract the hamstrings muscles. Hip and knee angle and electromyographic data from the gluteus maximus, medial hamstrings, and lateral hamstrings was measured while participants performed prone hip extension from 30 degrees of hip flexion to neutral. (see the figure above)
This information is important for clinicians using prone hip extension as either an evaluation tool or a rehabilitation exercise.