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Subject: Fwd: EMG activities of the quadratus lumborum and erect...[Clin Biomech (Bristol, Avon). 1996] - PubMed Result
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From: eleanor hoppe <eleanor_hoppe@mac.com>
Date: April 12, 2008 12:27:41 PM EDT
To: eleanor hoppe <eleanor_hoppe@yahoo.com>
Subject: EMG activities of the quadratus lumborum and erect...[Clin Biomech (Bristol, Avon). 1996] - PubMed Result
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1: Clin Biomech (Bristol, Avon). 1996 Oct;11(7):392-400.
EMG activities of the quadratus lumborum and erector spinae muscles during flexion-relaxation and other motor tasks.
Andersson EA, Oddsson LI, Grundström H, Nilsson J, Thorstensson A.
Department of Neuroscience, Karolinska Institute and Department of Sport and Health Science, University College of Physical Education and Sports, Stockholm, Sweden.
OBJECTIVE: The aim of this study was to provide new information on the myoelectrical activation of the quadratus lumborum, the deep lateral and the superficial medial lumbar erector spinae, the psoas, and the iliacus muscles in various motor tasks. DESIGN: An intramuscular electromyographic study was performed. BACKGROUND: The contribution of individual deep trunk muscles to the stability of the lumbar spine is relatively unknown in different tasks, including the flexion-relaxation phenomenon. METHODS: Seven healthy subjects participated. Fine-wire electrodes were inserted with a needle guided by ultrasound. RESULTS: The highest activity observed for quadratus lumborum and deep lateral erector spinae occurred in ipsilateral trunk flexion in a side-lying position and for superficial medial erector spinae during bilateral leg lift in a prone position. Quadratus lumborum and deep lateral erector spinae were activated when the flexion-relaxation phenomenon was present for superficial medial erector spinae, i.e. when its activity ceased in the latter part of full forward flexion of the trunk, held relaxed and kyphotic. CONCLUSIONS: In general, the activation of the investigated muscles showed a high degree of task specificity, where activation of a certain muscle was not always predictable from its anatomical arrangement and mechanical advantage.
PMID: 11415651 [PubMed - as supplied by publisher]
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