Article

Prone hip extension has been used as a self-perturbation task to test the
stability of the lumbopelvic region. However, the relationship between
recruitment patterns in the hip and trunk muscles and lumbopelvic kinematics
remains unknown. The present study aimed to examine if the balance of hip and
trunk muscle activities are related to pelvic motion and low back muscle activity
during prone hip extension. Sixteen healthy participants performed prone hip
extension from 30 degrees of hip flexion to 10 degrees of hip extension. Surface
electromyography (of the gluteus maximus, semitendinosus, rectus femoris, tensor
fasciae latae, multifidus, and erector spinae) and pelvic kinematic measurements
were collected. Results showed that increased activity of the hip flexor (tensor
fasciae latae) relative to that of hip extensors (gluteus maximus and
semitendinosus) was significantly associated with increased anterior pelvic tilt
during hip extension (r=0.52). Increased anterior pelvic tilt was also
significantly related to the delayed onset timing of the contralateral and
ipsilateral multifidus (r=0.57, r=0.53) and contralateral erector spinae
(r=0.63). Additionally, the decrease of the gluteus maximus activity relative to
the semitendinosus was significantly related to increased muscle activity of the
ipsilateral erector spinae (r=-0.57). These results indicate that imbalance
between the agonist and antagonist hip muscles and delayed trunk muscle onset
would increase motion in the lumbopelvic region.
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Langue : ANGLAIS