Capability and recruitment patterns of trunk during isometric uniaxial and biaxial upright exertion

Clinical Biomechanics
Ali SheikhzadehMargareta Nordin

Abstract

Work-related risk factors of low back disorders have been identified to be external moments, awkward postures, and asymmetrical dynamic lifting amongst others. The distinct role of asymmetry of load versus posture is hard to discern from the literature. Hence, the aim of this study is to measure isometric trunk exertions at upright standing posture at different exertion level and degree of asymmetry to further delineate the effects of exertion level and asymmetry on neuromuscular capability response. Fifteen healthy volunteers randomly performed trunk exertions at three levels (30%, 60%, and 100% of maximum voluntary exertion and five different angles (0 degrees , 45 degrees , 90 degrees , 135 degrees , and 180 degrees ) of normalized resultant moments. During each trial, the normalized EMG activity of 10 selected trunk muscles was quantified. The EMG activity of the 10 trunk muscles was significantly (P<0.001) affected by the level of exertion and angle of normalized resultant moment, and their interactions. The controllability of the torque generation was reduced in biaxial exertions. The capability to generate and control the required trunk moments is significantly lowered during biaxial trunk exertions, while all muscles pr...Continue Reading

References

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Citations

Mar 13, 2014·IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society·Sam PerlmutterJulius P A Dewald
Feb 24, 2009·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Steven L FischerClark R Dickerson
Sep 12, 2009·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·M R AzghaniM Parnianpour
Feb 24, 2021·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·A M AlsubaieD Falla

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