PainSci summary of Andersson 1996?This page is one of thousands in the PainScience.com bibliography. It is not a general article: it is focused on a single scientific paper, and it may provide only just enough context for the summary to make sense. Links to other papers and more general information are provided at the bottom of the page, as often as possible. ★★★☆☆3-star ratings are for typical studies with no more (or less) than the usual common problems. Ratings are a highly subjective opinion, and subject to revision at any time. If you think this paper has been incorrectly rated, please let me know.
An EMG study showing that quadratus lumborum is most active in a wide plank position, and curiously activates at the same time the big trunk extensors relax in flexion (flexion-relaxation phenomenon, a reduction or silence of myoelectric activity of the lumbar erector spinae muscle during full trunk flexion). See also McGill et al.
original abstract†Abstracts here may not perfectly match originals, for a variety of technical and practical reasons. Some abstacts are truncated for my purposes here, if they are particularly long-winded and unhelpful. I occasionally add clarifying notes. And I make some minor corrections.
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.
- “Quantitative intramuscular myoelectric activity of quadratus lumborum during a wide variety of tasks,” S McGill, D Juker, and P Kropf, Clin Biomech (Bristol, Avon), 1996.
- “Anatomy and biomechanics of quadratus lumborum,” S Phillips, S Mercer, and N Bogduk, Proc Inst Mech Eng H, 2008.
- “Heterotopic ossification of the quadratus lumborum muscle,” Brie Alport, David Horne, and Brent Burbridge, J Radiol Case Rep, 2014.
- “Changes in the flexion-relaxation response induced by hip extensor and erector spinae muscle fatigue,” Martin Descarreaux, Danik Lafond, and Vincent Cantin, BMC Musculoskeletal Disorders, 2010.
One article on PainScience.com cites Andersson 1996 as a source:
- PS Massage Therapy for Low Back Pain — Perfect Spot No. 2, in the erector spinae and quadratus lumborum muscles in the thoracolumbar corner
This page is part of the PainScience BIBLIOGRAPHY, which contains plain language summaries of thousands of scientific papers & others sources. It’s like a highly specialized blog. A few highlights:
- Effectiveness of customised foot orthoses for Achilles tendinopathy: a randomised controlled trial. Munteanu 2015 Br J Sports Med.
- A Bayesian model-averaged meta-analysis of the power pose effect with informed and default priors: the case of felt power. Gronau 2017 Comprehensive Results in Social Psychology.
- The neck and headaches. Bogduk 2014 Neurol Clin.
- Agreement of self-reported items and clinically assessed nerve root involvement (or sciatica) in a primary care setting. Konstantinou 2012 Eur Spine J.
- Effect of NSAIDs on Recovery From Acute Skeletal Muscle Injury: A Systematic Review and Meta-analysis. Morelli 2017 Am J Sports Med.