caa a22 4500 445834269 CHVBK 20180317145325.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s00586-010-1508-5 doi (NATIONALLICENCE)springer-10.1007/s00586-010-1508-5 Is the psoas a hip flexor in the active straight leg raise? [Elektronische Daten] [Hai Hu, Onno Meijer, Jaap van Dieën, Paul Hodges, Sjoerd Bruijn, Rob Strijers, Prabath Nanayakkara, Barend van Royen, Wen Wu, Chun Xia] 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, 20-40years, 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 between Side and Condition for the psoas. Although ipsilateral psoas activity is consistent with the psoas being a hip flexor, contralateral activity is not. The most simplest explanation of the pattern found is that the psoas is bilaterally recruited to stabilize the lumbar spine, probably in the frontal plane. The Author(s), 2010 M. psoas nationallicence Hip flexion nationallicence Fine-wire EMG nationallicence Lumbar spine stability nationallicence Active straight leg raise nationallicence Hu Hai Faculty of Human Movement Sciences, Research Institute MOVE, VU University, Van Der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands aut Meijer Onno Faculty of Human Movement Sciences, Research Institute MOVE, VU University, Van Der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands aut van Dieën Jaap Faculty of Human Movement Sciences, Research Institute MOVE, VU University, Van Der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands aut Hodges Paul Centre of Clinical Research Excellence in Spinal Pain, Injury and Health, School of Rehabilitation Sciences, The University of Queensland, Brisbane, QLD, Australia aut Bruijn Sjoerd Faculty of Human Movement Sciences, Research Institute MOVE, VU University, Van Der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands aut Strijers Rob Department of Clinical Neurophysiology, VU University Medical Centre, Amsterdam, The Netherlands aut Nanayakkara Prabath Department of Internal Medicine, VU University Medical Centre, Amsterdam, The Netherlands aut van Royen Barend Department of Orthopaedic Surgery, VU University Medical Centre, Amsterdam, The Netherlands aut Wu Wen Second Affiliated Hospital of Fujian Medical University, Quanzhou, Fujian, People's Republic of China aut Xia Chun Department of Orthopaedics, Zhongshan Hospital, Xiamen University, Xiamen, Fujian, People's Republic of China aut European Spine Journal Springer-Verlag 20/5(2011-05-01), 759-765 0940-6719 20:5<759 2011 20 586 https://doi.org/10.1007/s00586-010-1508-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00586-010-1508-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hu Hai Faculty of Human Movement Sciences, Research Institute MOVE, VU University, Van Der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands aut NATIONALLICENCE 700 1- Meijer Onno Faculty of Human Movement Sciences, Research Institute MOVE, VU University, Van Der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands aut NATIONALLICENCE 700 1- van Dieën Jaap Faculty of Human Movement Sciences, Research Institute MOVE, VU University, Van Der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands aut NATIONALLICENCE 700 1- Hodges Paul Centre of Clinical Research Excellence in Spinal Pain, Injury and Health, School of Rehabilitation Sciences, The University of Queensland, Brisbane, QLD, Australia aut NATIONALLICENCE 700 1- Bruijn Sjoerd Faculty of Human Movement Sciences, Research Institute MOVE, VU University, Van Der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands aut NATIONALLICENCE 700 1- Strijers Rob Department of Clinical Neurophysiology, VU University Medical Centre, Amsterdam, The Netherlands aut NATIONALLICENCE 700 1- Nanayakkara Prabath Department of Internal Medicine, VU University Medical Centre, Amsterdam, The Netherlands aut NATIONALLICENCE 700 1- van Royen Barend Department of Orthopaedic Surgery, VU University Medical Centre, Amsterdam, The Netherlands aut NATIONALLICENCE 700 1- Wu Wen Second Affiliated Hospital of Fujian Medical University, Quanzhou, Fujian, People's Republic of China aut NATIONALLICENCE 700 1- Xia Chun Department of Orthopaedics, Zhongshan Hospital, Xiamen University, Xiamen, Fujian, People's Republic of China aut NATIONALLICENCE 773 0- European Spine Journal Springer-Verlag 20/5(2011-05-01), 759-765 0940-6719 20:5<759 2011 20 586 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer