Is the psoas a hip flexor in the active straight leg raise?

European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society
Hai HuChun Xia

Abstract

Psoas function is a topic of considerable relevance in sports and clinical science. However, the literature on psoas function is not sufficiently consistent. Questions are, amongst others, if during hip flexion the psoas always has the same function as the iliacus, and if the psoas affects the hip more than the lumbar spine. In the present study, 17 healthy women, 20-40 years, performed the active straight leg raise (ASLR), with the right or the left leg ("Side"), and without or with weight added above the ankle ("Condition"). Electromyographic (EMG) activity of psoas and iliacus were recorded with fine-wire electrodes, and of rectus femoris and adductor longus with surface electrodes, all on the right side. Movements of the leg were recorded with active markers and a camera system. During ASLR, the iliacus, rectus femoris, adductor longus and psoas were active ipsilaterally, but psoas was also active contralaterally. All muscles started to contract before movement onset, the iliacus, rectus femoris, and adductor longus largely at the same time, before the psoas. There was no significant difference between the amplitude or time of onset of ipsilateral and contralateral psoas EMG activity, nor was there a significant interaction...Continue Reading

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Citations

Oct 22, 2013·Archives of Physical Medicine and Rehabilitation·Janice M MoresideCheryl L Hubley-Kozey
Mar 14, 2014·Clinical Interventions in Aging·Alice S Ryan, Aruna Selina Harduarsingh-Permaul
Feb 3, 2012·European Journal of Applied Physiology·Yoshihiro HoshikawaHiroaki Kanehisa
Jul 31, 2019·Journal of Strength and Conditioning Research·Alejandro SanzFlorentino Huertas
Mar 23, 2015·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Kristian ThorborgPer Hölmich
Feb 16, 2019·Progress in Rehabilitation Medicine·Masahiro YamaneHayato Kawaji
Aug 30, 2021·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Yu OkuboPaul W Hodges

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