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John M. Mayer, James E. Graves, Todd M. Manini, James L. Nuzzo and Lori L. Ploutz-Snyder

The purpose of this preliminary study was to assess lumbar multifidus, erector spinae, and quadratus lum-borum muscle activity during lifts as measured by changes in transverse relaxation time (T2) from magnetic resonance imaging (MRI). Thirteen healthy adults performed dynamic squat, stoop, and asymmetric stoop lifts at a standard load, with each lift followed by MRI. Increase in T2 for the multifidus and erector spinae was greater for the stoop than squat. No difference in T2 increase was noted between the multifidus and erector spinae for the squat or stoop. Increase in T2 for the contralateral multifidus was less for the asymmetric stoop than stoop. Future research using MRI and other biomechanical techniques is needed to fully characterize lumbar muscle activity during lifts for various populations, settings, postures, and loads.

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Kristi Edgar, Aimee Appel, Nicholas Clay, Adam Engelsgjerd, Lauren Hill, Eric Leeseberg, Allison Lyle and Erika Nelson-Wong

bracing and altered muscle activation patterns supports the hypothesis that SIJ bracing may impact the neural control subsystem, which aids in determining and implementing a stability strategy for a given movement scenario. Park et al 26 concluded that SIJ bracing modified GMed and quadratus lumborum

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Matthew D. DeLang, Mehdi Rouissi, Nicola L. Bragazzi, Karim Chamari and Paul A. Salamh

.1080/0264041031000102042 10.1080/0264041031000102042 14620028 65. Hides J , Fan T , Stanton W , Stanton P , McMahon K , Wilson S . Psoas and quadratus lumborum muscle asymmetry among elite Australian Football League players . Br J Sports Med . 2010 ; 44 : 563 – 567 . PubMed ID: 18801772 doi:10.1136/bjsm