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Strengthening the lumbar extensor musculature is a common recommendation for chronic low back pain (CLBP). Although reported as effective, variability in response in CLBP populations is not well investigated. This study investigated variability in responsiveness to isolated lumbar extension (ILEX) resistance training in CLBP participants by retrospective analysis of three previous randomized controlled trials. Data from 77 participants were available for the intervention arms (males = 43, females = 34) 37 participants data (males = 20, females = 17) from the control arms. Intervention participants had all undergone 12 weeks of ILEX resistance training and changes in ILEX strength, pain (visual analogue scale; VAS), and disability (Oswestry disability index; ODI) measured. True inter-individual (i.e., between participants) variability in response was examined through calculation of difference in the standard deviation of change scores for both control and intervention arms. Intervention participants were classified into responder status using k-means cluster analysis for ILEX strength changes and using minimal clinically important change cut-offs for VAS and ODI. Change in average ILEX strength ranged 7.6 Nm (1.9%) to 192.1 Nm (335.7%). Change in peak ILEX strength ranged -12.2 Nm (-17.5%) to 276.6 Nm (169.6%). Participants were classified for strength changes as low (n = 31), medium (n = 36), and high responders (n = 10). Change in VAS ranged 12.0 mm to -84.0 mm. Participants were classified for VAS changes as negative (n = 3), non-responders (n = 34), responders (n = 15), and high responders (n = 19). Change in ODI ranged 18 pts to -45 pts. Participants were classified for ODI changes as negative (n = 2), non-responders (n = 21), responders (n = 29), and high responders (n = 25). Considerable variation exists in response to ILEX resistance training in CLBP. Clinicians should be aware of this and future work should identify factors prognostic of successful outcomes.
Pubmed ID: 29035297
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THIS RESOURCE IS NO LONGER IN SERVICE, documented on February 06, 2013. Per the associated paper, Aguirre GK (2012) FIASCO, VoxBo, and MEDx: behind the code. Neuroimage 62: 765-7, the MedX software was discontinued. The website itself however, looks like you can still buy it (website last updated 2004). Highly optimized, portable, commercial software for the visualization, processing, and analysis of medical images. The packages include: SPM '99, FSL, DICOM Import/Export, ABLe, Functional Data Simulator. Designed especially for medical imaging researchers and system developers, MEDx brings multi-modality, multi-dimensional image processing functionality to the medical imaging research community. With MEDx, users display images and control menus using the industry-standard XWindow display system and Tcl/Tk interface language. MEDx transforms your computer into a powerful image processing workstation that displays, analyzes, and processes your medical image data in a myriad of innovative ways.
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