The results suggest that an HEA of 120° should be used during performance of the PP because it produces greater SA activation than HEAs of 60° and 90°.

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Background The strength of iliopsoas muscle is frequently measured to evaluate the performance of hip flexion in the clinical setting. However, little research into the test-retest reliability of iliopsoas muscle strength in subjects with lumbar extension syndrome (LES) in supine position has been reported.